What is Boost: Definition and 137 Discussions

Boost is a set of libraries for the C++ programming language that provides support for tasks and structures such as linear algebra, pseudorandom number generation, multithreading, image processing, regular expressions, and unit testing. It contains 164 individual libraries (as of version 1.76).Most of the Boost libraries are licensed under the Boost Software License, designed to allow Boost to be used with both free and proprietary software projects. Many of Boost's founders are on the C++ standards committee, and several Boost libraries have been accepted for incorporation into the C++ Technical Report 1, the C++11 standard (e.g. smart pointers, thread, regex, random, ratio, tuple) and the C++17 standard (e.g. filesystem, any, optional, variant, string_view).

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  1. S

    Variation of Action under a Boost

    Homework Statement Calculate the variation of the action ##S = \int L dt = \int \frac{1}{2} m v^{2} dt## under a boost ##\vec v \rightarrow \vec v + \vec v_{0}##. Homework Equations The Attempt at a Solution ##\delta S## ##= \int \delta L\ dt## ##= \int \frac{1}{2} m\ \delta(\vec v^{2})\...
  2. mnmman

    Sunlight Intensity Concentrator - Idea to boost solar energy

    So I had this idea and I want to run it by some people and see if it's 1) possible 2) worthy of pursuing further 3) a good idea. I don't have a degree in engineering or physics, I'm currently studying chemistry and am taking physics 2 (E&M) right now, so excuse me if I don't use the correct...
  3. T

    How Does Mark-Space Ratio Affect Boost Converter Performance?

    Homework Statement I have recently learned about the boost SMPS and and have built a circuit to investigate the waveforms and levels for Vout, [L] and [C] for different mark space ratios. the circuit consists of a 95uH inducotr, diode, 47uF cap, 70 Ohm load, a FET who's gate is controlled...
  4. L

    Finding Lorentz boost speed

    Homework Statement In the inertial frame of observer A two events occur at the same position a time 10 ns apart. In the frame of the observer B moving with respect to RA, one event occurs 1m away from the other. What is the difference in time between the two events in B's frame. Solve by...
  5. J

    C/C++ Help getting Boost included in my C++ program

    I've changed the Library Search Path to the folder that contains the file I'm trying to use, filesystem.hpp, and then including the file with the directive #include <filesystem.hpp>. I've also tried changing it to "filesystem.hpp"; changing the search to recursive; trying to grab it from the...
  6. M

    Commutator of Boost Generator with Creation operator

    Homework Statement Given that U upon acting on the creation operator gives a creation operator for the transformed momentum $$U(\Lambda) a_p^\dagger U(\Lambda)^\dagger = a_{\boldsymbol{\Lambda} \mathbf{p}}^\dagger $$ and ##\Lambda ## is a pure boost, that is ## U(\Lambda) = e^{i...
  7. ChrisVer

    What is boost supposed to mean?

    What does it mean to boost something along the z axis? To give some acceleration to it, or to spatially translate it? I think it's the 2nd?
  8. J

    Designing a Boost Converter: Finding L for CCM Operation

    Homework Statement I have some very big difficulties with this assignment, hope someone can give me some clue in the right direction Design the boost converter represented in and operating in continuous conduction mode (CCM). The usual hypotheses apply: the output voltage is considered to...
  9. H

    Switched capacitive boost converter analysis

    Plz guide how I can solve below circuit i.e. its transient analysis..final expression for load voltage..it is actually mode 3 of my capacitor based boost converter ..in mode 3 T2 transistor on while T1 off..so output would be double..I need expression for instantenous
  10. Artlav

    Constant current boost converter problems

    Hi. I want to make a constant current driver for a Xenon arc lamp. It takes 12V as input, should give out 8A at 15 - 20V, and maintain 50V idle voltage. I used a TL494 to control it, single-ended output driving a boost converter. 100KHz frequency. Schematics attached below. It...
  11. S

    What is the difference between Boost and Translation?

    As we face in Poincaré Transformation, there are boost and translational symmetry.What is the difference between these two terms?
  12. C

    Lorentz boost matrix in terms of four-velocity

    As I understand it, the value of a 4-vector x in another reference frame (x') with the same orientation can be derived using the Lorentz boost matrix \bf{\lambda} by x'=\lambda x. More explicitly, $$\begin{bmatrix} x'_0\\ x'_1\\ x'_2\\ x'_3\\ \end{bmatrix} = \begin{bmatrix}...
  13. J

    Rotation and Boost Commutating on the Same Axis

    I want to prove that: [J_1,G_1] = 0 Where J is the rotation operator and G is the boost operator (subscript refers to the axis). I am using the Jacobi identity: [[J_1,J_2],G_3] = [[G_3,J_2],J_1] +[[J_1,G_3],J_2] Using other identities, I got: [J_3,G_3] = [G_2,J_2] - [G_1,J_1]...
  14. S

    Boost converter - ripple current

    Whilst looking at the possible parts for a boost converter I came across references to making sure that the capacitor could handle the "ripple current". I looked a bit further and can see 2 possibilities. 1) The ripple in the capacitor current itself ie the difference between the minimum and...
  15. Artlav

    Boost converter switch node spiking

    Greetings. I'm making a high power boost converter, supposed to deliver constant current at 15-50V from about 12V input. 100KHz frequency. There are problems, however. There was a lot of ringing at the switch node - meeting point of the diode, inductor and MOSFET. 5.8Mhz clear decaying...
  16. C

    Did the Higgs Boson boost undergraduate physics enrollment?

    I am writing about some crazy hypothesis I have about the impact the quest for the Higgs Boson, thereafter designated as HB, might have had on the number of people who declared physics majors during the years following its discovery. The preliminary data I have concerns two universities in my...
  17. B

    BOOST SMPS/Converter in Discontinuous Conduction Mode

    Homework Statement A boost SMPS has the following design properties: Input Voltage - Vi = 6.0v Maximum Output Current - Io(max) = 0.5A switching frequency - F = 100khz Inductor = 500μH Capacitor = 1000μF with ESR 25mΩ Consider the boost SMPS operating in discontinuous conduction...
  18. F

    Does a single boost change the spin orientation?

    Say I have a particle in the rest frame with spin up in the z direction. If I boost the system in x direction, does the spin still point in the z direction? Why or why not? In Dirac Spinor, if I choose "spin up", namely setting \phi=\begin{bmatrix}1\\0\end{bmatrix} in the notation shown in...
  19. H

    General matrix representation of lorentz boost

    Hello! I'm trying to derive the general matrix form of a lorentz boost by using the generators of rotations and boosts: I already managed to get the matrices that represent boosts in the direction of one axis, but when trying to combine them to get a boost in an arbitrary direction I always...
  20. M

    Double interleaved dc-dc boost converter power management

    Hi there, (Please find attached diagram) I have Dc-dc Boost converter designed to step up (12-24Volts) to 28.8Volts(10Amps). The converter is currently working perfectly(stepping up 24V-28.8voltage) with a dc power supply, however this Dc converter after completion, will be fed up to a max...
  21. D

    Quantifying impact of boost leak on a turbocharged engine

    Is there a general equation that can be used to determine the impact that a leak of a given size will have on a turbocharged engine? For example, if I know the expected boost for a given operating point (air mass through the system, pressure, temperature, etc) and I know the actual boost, can I...
  22. H

    Invariance of the y coordinate for a boost along the x axis

    Homework Statement I've been reading through Spacetime Physics by Taylor & Wheeler, but this argument about the invariance of the y coordinate for inertial frames, one moving relative to the other on the x axis, is tripping me up. I'll just write the text word for word: I'm just not...
  23. P

    Action invariance under galilean boost

    Hello, I've been spending a lot of time trying to solve this problem but I can't figure out a good solution. I have to show that the action of a non-relativistic particle ( Schrodinger density Lagrangian ) is invariant under Galilean boost with the form...
  24. E

    12V / 6A Power supply. Help with Buck and Boost converters + OR'ing circuit

    Hello all. Maybe someone here can give me suggestion of ICs and make considerations about this design. The attached picture states how this power supply should work. Details: 1) IC 1 probably will be a LT3650-8.4 from Linear Technology. It supports up to 32V of input voltage (40V peak)...
  25. pinu

    What is the conserved quantity for boosts in the Poincare group?

    In (3+1) dimension Poincare group has three types of Symmetries : I. Space-time translations - 4 II. Spatial rotations -3 & III. Boosts -3 Among them, (I) implies "conservation of 4-momentum" , (II) implies "conservation of angular momentum" , But...
  26. Z

    Summer Work to Boost Your Physics Resume for Graduate School

    So as the title stated, what kind of summer work would be good to put on one's resume, for helping an undergraduate to get into a good physics graduate program? It feels like awards such as REU and NSERC are usually rewarded to the top standing students, and hence are not overly easy to get, by...
  27. A

    Testing Boost Your SAT Math Score: Strategies for Improvement

    Hello everyone, I'm currently in high school and will be applying to universities this summer. I recently took my SATs and, although I did pretty well on the english sections (Writing=650 and Reading=600), I was extremely disappointed by my maths score (640). Now I'm not generally weak in maths...
  28. B

    DC - DC (boost) Converter Design

    Hello, I'm trying to design a boost converter, Vin =9V, Vout = 30V. I've read several publications about it and I've noticed that some of them ask one to specify the peak inductor current, diode voltage drop etc..how do I know the peak inductor current if I don't yet know the value of the...
  29. N

    Why Does Duty Cycle Determine Voltage Gain in Boost Converters?

    http://www.roboticsguy.com/uploads/gallery/album_13/gallery_1_13_9081.png I'm trying to understand how to design a boost converter and have been reading about them for the past week or so. I've come a long way and now understand basically how they work, but I have a couple of questions on...
  30. J

    Three-stage boost for 4-cyl engine?

    I have a 2004 Chevy Cavalier with the 2.2L Ecotec. I already have a supercharger and charge air cooler on it. What I'm contemplating is adding ram air and an "e-turbo". Since the boost is multiplied in each stage of boost, any increase into the throttle body would be multiplied considerably...
  31. S

    Why Is Adjusting the Duty Cycle Necessary in Boost Converters?

    Hi, Recently I am learning boost converters. Here I have a "dumb" question, can anyone help me? From textbooks, it is known that if other loss is ignored, the Vout = Vin /(1-D), where D is the duty cycle of the switching signal. Usually there is a feedback network that senses the part...
  32. Z

    Is it a good idea to repeat low first year classes to boost your overall GPA?

    I am a 3rd-4th year student planning to try and get into graduate school in my field of study. But I got some terrible marks in my first year in courses relating to my program (science and math courses), and in a non-related course. Since some universities specifically require an undergraduate...
  33. facenian

    Confusion in Lorentz Boost Equations: Minus Sign Needed?

    On page 29 equations 2.1.20 and 2.1.21 of Gravitation and Cosmology by S. Weinberg he gives these expresions for matrix componentes: \Lambda_j^0=\gamma v_j My question is: shouldn't there be a minus sign on left side of the equation?
  34. D

    Why is my boost converter output voltage spiking when load is removed?

    Hi need some help here. I have designed a dc-dc boost converter to give output voltage of 11v from 6 v input. Well it has been implimented on PCB, works fine but one thing i din't understand well. The have adjusted the duty cycle to get my 11volts on load(LED Load), when i remove the load...
  35. K

    Performing a Global Boost in General Relativity: A Brief Guide

    Let us assume that I have set up a Cartesian coordinate frame in a system that follows the rules of general relativity. From the origin it seems that translation and rotation of coordinates should be trivial. All the action is in the metric and it will follow along with the transformations...
  36. H

    Difference between boost inductor and flyback inductor?

    What is the difference between a boost inductor and a flyback inductor?
  37. H

    Deriving General Lorentz Boost Equation

    Greetings, I have been having trouble deriving the equation for the general Lorentz boost for velocity in an arbitrary direction. It seems to me that given the 1D Lorentz transformations... matrix for Lorentz transformation in x-direction, X: {{1/sqrt(1-v^2), -v/sqrt(1-v^2), 0, 0}...
  38. R

    12 DC Volt Boost to 15 DC Volt - 1 amp

    Superb Old Labtech Speakers to add to my RV without 120 Volt AC The Labtech AC adapter's output is 15VDC 1000ma. Using my existing 12VDC power supply (2 - 6VDC inline Deep charge Batteries) may I boost this output to 15VDC by adding 2 ?or? 3 Duracell Rechargeable AA batteries. Duracell...
  39. T

    Dark Energy Theory Gets Boost From New Measurements

    Dark Energy Cosmology makes the front page again: In a new study, a team of researchers led by Adam Riess of the Space Telescope Science Institute in Baltimore, report that they've calculated how fast the universe is expanding to a greater degree of accuracy than ever before, shrinking the...
  40. B

    Is the Wave Equation Invariant Under a Lorentz Boost?

    Homework Statement i) Show that the wave equation: [( -1/c^2) d^2/dt^2 + d^2/dx^2 + d^2/dy^2 + d^2/dz^2 ]u(t,x,y,z) = 0 is invariant under a Lorentz boost along the x-direction, i.e. it takes the same form as a partial differential equation in the new coordinates. [Use the chain rule in two...
  41. J

    Lorentz boost, electric field along x-axis, maths confusion?

    Homework Statement Given that (φ/c,A) is a 4-vector, show that the electric field component Ex for a Lorentz boost along the x-axis transforms according to Ex' = Ex. Homework Equations E_x = -\frac{\partial \phi}{\partial x} - \frac{\partial A_x}{\partial t} A_x being the x component of the...
  42. O

    Polyphasic Sleep (Uberman) to boost GPA

    Hey guys, Description of Sleep Schedule I'm not sure if you have heard of the "Uberman sleep schedule" before but it consists of sleeping in 30 minute nap periods every 4 hours so that you can stay up consistently 24/7. I'm not sure if there are long-term detrimental effects but I am...
  43. N

    The lorentz boost of the CM frame w/ respect to the lab frame

    Hi i have a problem with some work. a muon type neutrino interacts with a stationary electron, producing a muon and electron type neutrino. I have calculated the CM energy but now need to calculate gamma, the lorentz boost. γ=(Eν/2me)^1/2 How do i show this? the info i have is that...
  44. G

    Deriving the Lorentz Boost for an Arbitrary Direction

    Homework Statement So, I'm working through a relativity book and I'm having trouble deriving the Lorentz transformation for an arbitrary direction v=(v_{x},v_{y},v_{z}): \[\begin{pmatrix} {ct}'\\ {x}'\\ {y}'\\ {z}' \end{pmatrix}=\begin{pmatrix} \gamma & -\gamma \beta _{x} &...
  45. L

    Lorentz Transformations boost?

    Define B( \theta, \vec{n} ) \in SL( 2 , \mathbb{C} ) by B( \theta , \vec{n}) = \cosh { \frac{1}{2} \theta} + \vec{\sigma} \cdot \vec{n} \sinh{ \frac{1}{2} \theta} where \vec{n}^2 =1 Show that this corresponds to a Lorentz boost with velocity \vec{v}=\tanh{ \theta} \vec{n}. Show that ( 1 +...
  46. N

    PI controller (feed back control) for boost converter

    Hello Everyone, I am trying to put together a PI controller for a boost converter. Vin = 150V Vout = 300V (Require this much boost) Switching Frequency = 25KHz I am attaching a schematic in PSPICE. Please , someone, tell me if the connections are right. Also V-PULSE / SAWTOOTH = (0...
  47. T

    Peak Torque Calculation for Twin T3/T4 Turbos in 2.0L Camry Motor

    Herro guys, I'm trying to build a motor for shop class (from scratch really, new manifolds, ect :o), I'm only 15 so please take it easy on me :redface: Anyways, I've been trying to calculate my ideal runner length/diameter and stufflets for the intake manifold design. I've got a question...
  48. K

    Is it common for people to drink tea/coffee to boost their performance?

    i always see people carrying a starbucks coffee or bottled tea in library and lectures. My friends said that drinking these can make people feel awake and think faster. Is it true? As they are quite expensive and the taste is quite bitter. Are there other alternative/cheaper ways to boost...
  49. P

    Anticommutator of Parity and Boost

    Homework Statement Show that the anticommutator of parity and boost is zero. Homework Equations \{\mathcal{P},K^{i}\}=0 The Attempt at a Solution Let the anti commutator act on a state \{\mathcal{P},K^{i}\}\Psi(t,\vec{x})=\mathcal{P}K^{i}\Psi(t,\vec{x})+K^{i}\mathcal{P}\Psi(t,\vec{x})...
  50. L

    Boost generator transforms as vector under rotations

    Hi, I've read quite a few times now in group theory and QFT books that [X_i,Y_j]=i\epsilon_{ijk}Y_k can be regarded as saying that \vec{Y} , the vector of boost generators transforms as a vector under rotations (where X are SO(3) generators). I don't really understand why this implies...
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