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𝐇𝐨𝐰 𝐭𝐨 𝐦𝐚𝐤𝐞 𝐚𝐝𝐚𝐩𝐭𝐢𝐯𝐞 𝐭𝐮𝐧𝐧𝐞𝐥 𝐟𝐚𝐦𝐢𝐥𝐲 Last post about tunnels - though it probably should have been the first one :) It takes about 3 minutes to build one from scratch. 𝐊𝐞𝐲 𝐩𝐨𝐢𝐧𝐭𝐬:  – Two adaptive points (start and end of segment) – Solid form between them – Rotation and offset parameters at each end for curve alignment – Profile can be nested and swapped later Want to follow along? Full walkthrough in the video above. If you need a different section type - same logic applies. Crown, invert, haunch - just swap the profile geometry.

Day 4: Longest Subarray with Sum K(positives) Today's problem introduced me to the sliding window technique, a pattern that's becoming essential for array problems involving subarrays or subsequences. I used two pointers to create a dynamic window that expands and contracts based on the current sum. The right pointer expands the window by adding elements, while the left pointer shrinks it when the sum exceeds the target. The logic is straightforward. Expand the window by moving right and adding elements to the sum. If the sum exceeds k, shrink from the left by removing elements. When the sum equals k, calculate the window length and update the maximum. Time Complexity: O(n) Space Complexity: O(1) The sliding window technique is incredibly efficient for subarray problems. Instead of checking every possible subarray (which would be O(n²)), we maintain a valid window and adjust it in a single pass. The key is understanding when to expand and when to contract the window. This approach avoids nested loops and extra space, making it optimal for problems where we need to find contiguous subarrays with specific properties.

Most engineering failures happen in the "In-Between." Day 11: Eleven Pipers Piping 🎶 🎄 12 Days of CFD Christmas | Day 11 of 12 The secret to a piper's 🎶 smooth, clear note lies in stable airflow! We're diving into Laminar Flow and the Reynolds Number the metrics used to predict smooth vs. chaotic flow. Swipe to see how nature, like the shark's skin, uses texture to manipulate flow and reduce drag. #CFD #FluidDynamics #LaminarFlow #ReynoldsNumber #CFDXmas12

👀 Watch closely — especially the ceiling. In this video, two installers on scissor lifts are marking anchor points on the ceiling before drilling. If you look carefully at the black ceiling, you’ll notice small green laser dots already projected in place. Those dots are coming from the LightYX device on the floor. Instead of measuring, calling out offsets, or rechecking dimensions, the crew simply marks exactly where the laser indicates — then drills. ✔ Faster setup ✔ No interpretation ✔ Consistent anchor placement This workflow allows teams to mark ceiling anchor points 10–20× faster than manual layout, and significantly faster than any other layout technology used today. Tip: The laser points are small — watch the ceiling carefully.

Let’s talk about stability maps. In these maps, the boundary separates combinations of spindle speed and axial depth that are unstable/chatter (above) from those that are stable (below). The stability map depends on the structural dynamics, the workpiece material, and the tool geometry. For all four panels in the figure, the workpiece material is 6061-T6 aluminum. In the top left panel, the tool tip dynamics are varied. The stiffness is 5e6 N/m and the damping ratio is 0.01. There are 4 teeth on the endmill. The natural frequency is varied. In the top right panel, the tool tip dynamics are varied. The natural frequency is 750 Hz and the damping ratio is 0.01. There are 4 teeth on the endmill. The stiffness is varied. In the bottom left panel, the tool tip dynamics are varied. The natural frequency is 750 Hz and the stiffness is 5e6 N/m. There are 4 teeth on the endmill. The damping ratio is varied. In the bottom right panel, the tool tip dynamics are fixed. The natural frequency is 750 Hz, the stiffness is 5e6 N/m, and the damping ratio is 0.01. The number of teeth on the endmill is varied.

🔥 Following on from yesterday’s post on balcony spill plumes, it’s worth stepping back to the ideal case: the axisymmetric fire plume. This is the textbook plume vertical, perfectly symmetric, with entrainment from all sides, and it underpins most plume correlations used in fire engineering. But the moment a wall or balcony is introduced, axisymmetry is lost, entrainment is restricted, and the physics changes. That’s why spill plumes behave differently, and why this series will continue building from theory to real buildings. #FireEngineering #FireDynamics #SmokeControl #AtriumDesign #PerformanceBasedDesign #axi #symmetric #vertical #balcony #spill #plume #fire #heat #EbA #صدقة_العلم_نشره

PROBLEM 7.33 For the beam and loading shown, (a) draw the shear and bending-moment diagrams, (b) determine the maximum absolute values of the shear and bending moment.

Clip No. 3 Now, let's look at the heat-rebound dynamics acting on the aluminum plate. We are still within the LWIR spectral range. To interpret the footage, keep in mind that we are using a grayscale thermal palette, where dark colors represent cold areas and light colors represent warm areas. On the left side of the Al plate, the insulating paint was extended a few centimeters to the right, increasing the coated surface but with a thickness of 300 microns. Observe how quickly the surface cools down once the flow of hot air stops.

The Archimedes screw , It traditionally lifts water upward when rotated manually or mechanically, trapping liquid in pockets formed by the helix and gravity. When placed under a flowing water tap, the setup reverses: cascading water from the tap strikes the inclined helical surfaces, imparting downward force and momentum. This pushes the blades, causing the screw to rotate continuously as water flows through the spirals, demonstrating hydrodynamic energy transfer. ======== This video appears to demonstrate a reverse effect where falling water rotates a helical object, potentially causing it to rise—physically possible in principle. However, many analyses suggest this clip might be edited or use a string for the illusion. You can try replicating it with a lightweight spiral to test!