uncleflo
Registered since September 28th, 2017
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Anchoring: How much rope or chain should I let out? - NauticEd Sailing Blog
Saved by uncleflo on February 13th, 2022.
Anchoring, and getting it right is such an important topic that we thought we’d make this excerpt available for free in open space. Please enjoy how we dive into science and mathematics in these courses. If you like our style and how much knowledge you believe you could pick up in a full NauticEd course based on this little excerpt, consider take our full range of online sailing courses. Plus NauticEd has practical on-the-water training schools throughout the USA and Canada as well as other international locations. Check out, our two free sailing courses. NauticEd is a recognized sailing education body by the United States Coast Guard and can issue an official sailing license which is required by some countries to sail in their waters.
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python - How do I fit a sine curve to my data with pylab and numpy? - Stack Overflow
Saved by uncleflo on May 15th, 2021.
I am trying to show that economies follow a relatively sinusoidal growth pattern. I am building a python simulation to show that even when we let some degree of randomness take hold, we can still produce something relatively sinusoidal. I am happy with the data I'm producing, but now I'd like to find some way to get a sine graph that pretty closely matches the data. I know you can do polynomial fit, but can you do sine fit? You can use the least-square optimization function in scipy to fit any arbitrary function to another. In case of fitting a sin function, the 3 parameters to fit are the offset ('a'), amplitude ('b') and the phase ('c').
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How Heat Pumps Work - ADVANCED (design data) - YouTube
Saved by uncleflo on October 11th, 2019.
In this video we take a look at the technical data of how heat pumps work. Covering the basics, showing the typical system along with the main components and an animated drawing explaining its operation in both cooling and heating mode as well as how the refrigerant works.
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Ductwork sizing, calculation and design for efficiency - HVAC Basics + full worked example - YouTube
Saved by uncleflo on October 11th, 2019.
How to design a duct system. In this video we'll be learning how to size and design a ductwork for efficiency. Includes a full worked example as well as using CFD simulations to optimise the performance and efficiency. Discover more than 50 free on-demand webinars on different topics, from ventilation or data center design and wind load analysis to aerospace, F1, and sports aerodynamics here.
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Four laws of electromagnetism that you should know
Saved by uncleflo on July 22nd, 2019.
The operation of electric motors is governed by various laws of electricity and magnetism, including Faraday’s law of induction, Ampère’s circuital law, Lenz’ law, and the Lorentz force. The first two – Faraday’s law and Ampère’s circuital law – are included in Maxwell’s equations. Together with Lenz’ law and the Lorentz force, these principles form the basis of electromagnetism.
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Displacement-Length Ratio of a Yacht: Skipper's Basics – no-frills-sailing.com
Saved by uncleflo on February 24th, 2019.
When sailors are talking about their boats they often refer to ratios and numbers. That´s a tendency in human behaviour to try to generalize things to make them comparable. Of course, everybody knows that you cannot really describe apple to pears and so it´s worthless to describe a let´s say Seventies IOR-era King´s Cruiser 33 like mine to a modern day cruising yacht but we nevertheless tend to do so. The Displacement-Length-Ratio in general is a non-dimensional number. It sets into relation the displacement of a boat (expressed in pounds) to the length of her waterline (in feet). So, in general, this ratio is looking for the relation between the (heavy?) volume of water being pushed aside by a boat´s hull and the length (and therefore speed potential see for my article Hull speed vs. Froude number here) of her hull. Sounds fair enough?
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How to Draw a Gothic Arch
Saved by uncleflo on November 29th, 2018.
The tools you'll need to draw a Gothic arch are little more than a pen and paper. Draw a Gothic arch with help from an artist in this free video clip.
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Gothic Window - How to design a full gothic window with sections
Saved by uncleflo on November 29th, 2018.
Gothic Window in Malbork Castle, Poland. How to design a gothic window with sections and colored glasses from one building in Poland. A step by step guide on how to do the Mathematics and designs to get to the finished result. Very nice for an engineer or other exterior designer.
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Elements of Gothic windows
Saved by uncleflo on November 29th, 2018.
The movie on youtube shows how to decorate the inner tops of the windows of gothic windows and doors. The film with the constructions was prepared as a part of the Comenius Project Why Maths by the students and the teachers from Gimnazjum named after Anna Vasa in Golub-Dobrzyń, Poland.
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Ergonomics and car seat design with diagrams (Asian Language)
Saved by uncleflo on November 29th, 2018.
An article about the seat and cockpit design of a car, all written in an Asian Language. The Diagrams are very useful for making chairs.
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Learn about Robot Inverse Kinematics
Saved by uncleflo on June 13th, 2015.
We've seen the forward kinematics problem. The inverse kinematics problem is much more interesting and its solution is more useful. At the position level, the problem is stated as, "Given the desired position of the robot's hand, what must be the angles at all of the robots joints?" Humans solve this problem all the time without even thinking about it. When you are eating your cereal in the morning you just reach out and grab your spoon. You don't think, "my shoulder needs to do this, my elbow needs to do that, etc." Below we will look at how most robots have to solve the problem. We will start with a very simple example.
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Nonlinear Systems Laboratory Homepage
Saved by uncleflo on April 5th, 2015.
The Nonlinear Systems Laboratory is headed by Professor Jean-Jacques Slotine. Members and affiliates. Videos of Some of Our Research. Books. Journal Articles.
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Objectives_template
Saved by uncleflo on April 4th, 2015.
Now, let us assume that we have measured all the engineering constants of an orthotropic material along principal directions. With these engineering constants we know the relation between the strain and stress components as given in Equation (3.42) and Equation (3.43). Thus, it is easy to see that we can relate the strain components to stress components through compliance matrix. Let us recall from previous lecture the stiffness matrix for orthotropic material (Equation (3.26)). The inverse of this matrix (compliance) will have the same form as the stiffness matrix. Thus, we write the relationship between strain and stress components using compliance matrix as follows
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www.marketingexperiments.com
Saved by uncleflo on April 4th, 2015.
C = 4*m + 3*v + 2*(i - f) - 2*a. Anxiety is one of the key elements in the MarketingExperiments Conversion Heuristic. In our Landing Page Optimization Online Course, anxiety is defined as “a psychological concern stimulated by a given element in the sales or sign-up process.” Essentially, anxiety is a negative element on your landing page that reduces the likelihood that a potential customer will take a desired action. It’s no big surprise that experiments with our Research Partners have found third-party privacy and security seals help reduce customer anxiety and improve conversion. So, let’s take a look at two types of seals that can help you reduce customer anxiety.
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Calculate distance and bearing between two Latitude/Longitude points using Haversine formula in JavaScript
Saved by uncleflo on March 26th, 2015.
This page presents a variety of calculations for latitude/longitude points, with the formulæ and code fragments for implementing them. All these formulæ are for calculations on the basis of a spherical earth (ignoring ellipsoidal effects) – which is accurate enough* for most purposes.
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Calculating reflected ray
Saved by uncleflo on February 22nd, 2015.
This short note gives the equation for a reflected ray as used in many computer rendering applications, eg: ray tracing. Given a ray Ri incident at a point on a surface with normal N one wishes to determine the reflected ray from that point. The geometry and nomenclature is given in the following diagram.
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graphics.stanford.edu/courses/cs148-10-summer/docs/2006--degreve--reflection_refraction.pdf
Saved by uncleflo on February 22nd, 2015.
When writing a ray tracer, sooner or later you’ll stumble on the problem of reflection and transmission. To visualize mirror-like objects, you need to reflect your viewing rays. To simulate a lens, you need refraction. While most people have heard of the law of reflection and Snell’s law, they often have difficulties with actually calculating the direction vectors of the reflected and refracted rays. In the following pages, exactly this problem will be addressed. As a bonus, some Fresnel equations will be added to the mix, so you can actually calculate how much light is reflected or transmitted (yes, it’s possible). At the end, you’ll have some usable formulas to use in your latest ray tracer.
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Snell's law - Wikipedia, the free encyclopedia
Saved by uncleflo on February 22nd, 2015.
Snell's law (also known as the Snell–Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air. In optics, the law is used in ray tracing to compute the angles of incidence or refraction, and in experimental optics to find the refractive index of a material. The law is also satisfied in metamaterials, which allow light to be bent "backward" at a negative angle of refraction with a negative refractive index.
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Ray / Triangle intersection code - Math and Physics - GameDev.net
Saved by uncleflo on December 7th, 2014.
Hallo, Im working on the collision detection part of my program and have it partially working. Right now it works in some cases, but fails in other A triangle made like this works.
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Nozzle Design
Saved by uncleflo on September 2nd, 2014.
A rocket engine uses a nozzle to accelerate hot exhaust to produce thrust as described by Newton's third law of motion. The amount of thrust produced by the engine depends on the mass flow rate through the engine, the exit velocity of the flow, and the pressure at the exit of the engine. The value of these three flow variables are all determined by the rocket nozzle design.
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The Engineering Toolbox - Area Moment of Inertia
Saved by uncleflo on September 2nd, 2014.
Resources, Tools and Basic Information for Engineering and Design of Technical Applications! This great website is a great lookup site for formulas and calculations used in the engineering world. Second Moment of Area or Area Moment of Inertia. Moment of Inertia of an Area, Area Moment of Inertia, also known as Second Moment of Area - I, is a property of shape that is used to predict deflection, bending and stress in beams.
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An Intuitive (and Short) Explanation of Bayes’ Theorem | BetterExplained
Saved by uncleflo on July 16th, 2014.
Bayes’ theorem was the subject of a detailed article. The essay is good, but over 15,000 words long — here’s the condensed version for Bayesian newcomers like myself:
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MathJax
Saved by uncleflo on June 3rd, 2014.
MathJax is an open source JavaScript display engine for mathematics that works in all browsers. No more setup for readers. No more browser plugins. No more font installations… It just works.
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2D Convolution
Saved by uncleflo on May 19th, 2014.
Convolution is the most important and fundamental concept in signal processing and analysis. By using convolution, we can construct the output of system for any arbitrary input signal, if we know the impulse response of system. How is it possible that knowing only impulse response of system can determine the output for any given input signal? We will find out the meaning of convolution.
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NACA 4 digit airfoil generator (NACA 4408 AIRFOIL)
Saved by uncleflo on April 2nd, 2014.
This NACA airfoil series is controlled by 4 digits e.g. NACA 2412, which designate the camber, position of the maximum camber and thickness.
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