Mathematical modeling | Mathematical theorems

Grey box model

In mathematics, statistics, and computational modelling, a grey box model combines a partial theoretical structure with data to complete the model. The theoretical structure may vary from information on the smoothness of results, to models that need only parameter values from data or existing literature. Thus, almost all models are grey box models as opposed to black box where no model form is assumed or white box models that are purely theoretical. Some models assume a special form such as a linear regression or neural network. These have special analysis methods. In particular linear regression techniques are much more efficient than most non-linear techniques. The model can be deterministic or stochastic (i.e. containing random components) depending on its planned use. (Wikipedia).

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Excavator with Syringes Wooden Toy 3D Model

Based on a youtube video https://www.youtube.com/watch?v=e83drbSOoi4. Modeled with Solidworks 2015. Rendered with Simlab Composer 6 Mechanical Edition.

From playlist Wooden Toys

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Marble Machine Spoon Elevator 3D Model

Just for fun. It was based on several videos from Youtube about marble machines, and some of my own ideas. Modeled with Solidworks 2015. Rendered with Simlab Composer 6 Mechanical Edition. Gifs made with Photoscape. Renders edited with IrfanView.

From playlist Marble Machines

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King Model (extra footage)

A little continuation talking about Hubble... Main video is here: LINK

From playlist Sixty Symbols - Behind the Scenes

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First Attempt Cigar box Guitar. Inspired by @Nighthawkinlight

Just a guitar and some playing. it's in tune better than I play.

From playlist NightHawkInLight Community Video Responses!

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Mechanical T-Rex Wooden Toy 3D Model

Based on a picture found on Google Images. I made my own mechanisms, since they were not visible on the image. Modeled with Solidworks 2015. Rendered with Simlab Composer 6 Mechanical Edition. Free 3D model at https://skfb.ly/ontUU.

From playlist Wooden Toys

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Robot gripper 9

A grey cylinder opens and closes the jaws, permitting them to grasp and release objects. Pink, blue and green links create a slider crank mechanism. Inventor files of this video: http://www.mediafire.com/file/bxfzu9n23obvh5u/RobotGripper9Inv.zip

From playlist Mechanisms

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Four-Legs Walking-Machine 3D Model

Based on this site: (http://www.armure.ch/WALKING.htm). Modeled with Solidworks 2015. Rendered with Simlab Composer 7 Mechanical Edition.

From playlist Walking Machines

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Grey-box Bayesian Optimization by Peter Frazier

A Google TechTalk, presented by Peter I. Frazier, 2021/06/08 ABSTRACT: Bayesian optimization is a powerful tool for optimizing time-consuming-to-evaluate non-convex derivative-free objective functions. While BayesOpt has historically been deployed as a black-box optimizer, recent advances

From playlist Google BayesOpt Speaker Series 2021-2022

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CSS width, height, and overflow | Computer Programming | Khan Academy

Created by: pamela Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/computing/computer-programming/html-css/css-layout-properties/p/the-overflowing-ocean?utm_source=YT&utm_medium=Desc&utm_campaign=computerprogramming Watch the next lesson: https://

From playlist Intro to HTML/CSS: Making webpages | Computer Programming | Khan Academy

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Walking Carriage Wooden Toy 3D Model

Modeled with Solidworks 2016. Rendered with Simlab Composer 7 Mechanical Edition. Free 3D model at https://skfb.ly/6ZpAA.

From playlist Walking Machines

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Baker Fox Wooden Toy 3D Model

Modeled with Solidworks 2016. Rendered with Simlab Composer 8 Mechanical Edition. Free 3D model at https://skfb.ly/6YWLK.

From playlist Wooden Toys

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Heavy Rust Effects Made Simple

In which another super-cheap wagon gets experimented on. https://www.patreon.com/jagohazzard

From playlist Jago’s Trains

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JupyterLab Dev Meeting, September 2, 2016

Meeting of the JupyterLab development team, September 2, 2016 Meeting Notes: https://jupyter.hackpad.com/JupyterLab-Weekly-Meetings-UUJ3gIQ3iBS

From playlist Jupyter / IPython dev meetings

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She Walks In Beauty | Fashion Show at Savoy Hotel, Pt. 2 (1951) | Vintage Fashion

Fabulous gowns and suits modeled at the Savoy Hotel in London, 1951. This one specifically called ‘She Walks In Beauty’. So many stunning gowns and coats were showcased this night and won the approval of actresses, designers and more. #SheWalksInBeauty #Model #Fashion #BritishPathe Lic

From playlist Vintage Fashions Channel Videos | British Pathé

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Maths, pandemics and us | The Royal Society

This year, the topic of pandemics needs no introduction. Because of coronavirus, concepts such as the R number and herd immunity are no longer confined to academic discussion. Subscribe to our channel for exciting science videos and live events, many hosted by Brian Cox, our Professor for

From playlist Covid-19

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This Sudoku Is As Good As It Gets

Phistomefel has again created a sublime work of puzzle art with his Cave Sudoku. Play it here: https://cracking-the-cryptic.web.app/sudoku/Hph4Qn9fB9 Rules: [It is worth taking a quick look at the example solution at the link below as the rules are not too complicated once you "see" an

From playlist Phistomefel Puzzles

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Excel - Pivot Table Top Five Report - Podcast 1999

Microsoft Excel - Top Five Report in a Pivot Table. After limiting a pivot table report to the top five, the Grand Total does not show the total of everyone. This episode shows how to use a Data Filter in a pivot table. Recap: The pivot table Top 10 Filter gives a total of the visible rows

From playlist Full Advanced Excel Course - Free

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Quickly Discover Trends in Your Data using PivotTables in Excel October 23, 2019

This is a recording of the October 2019 monthly webinar in the Excel MVP Webinar series. In this free 59-minute webinar, Bill Jelen covers many pivot table techniques: Table of Contents (0:00) Welcome to the Pivot Table Webinar (1:36) Traditional Pivot Cache Pivot Tables (2:45) Setting u

From playlist Pivot Tables in Excel

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The Yin-Yang Sudoku Marvel

▶Today's Puzzle◀ *** OUR NEW KILLER SUDOKU APP IS JUST OUT ON ALL PLATFORMS - LINKS BELOW *** Today's puzzle is by Phistomefel and it's called Yin-Yang Sudoku. It should go without saying with his puzzles but this is a quite incredible sudoku. Play it at the link below: https://app.cr

From playlist Phistomefel Puzzles

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The Well Taylored Penguin Wooden Toy 3D Model

Original project from Woodworker’s Journal, February 2015. A wooden penguin toy which moves its body and wings up and down while "walking". It uses eccentric wheels and a cam to produce the movements. Free 3D model at https://skfb.ly/onIRU.

From playlist Wooden Toys

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Neural network | Computer experiment | Mathematical optimization | Bootstrap aggregating | Statistics | Chi-squared distribution | Design of experiments | Model selection | Simulated annealing | Statistical model | Non-linear least squares | Mathematics | System identification | Linear regression | Nonlinear system identification | Stochastic | Mathematical model | Design matrix | Systems theory | System dynamics | Cross-validation (statistics)