Fight Waves With More Waves!

Proof without words - Pi

This was intended to be posted on Pi-day earlier this month, but somehow that didn’t happen.

Hope this beautiful pi gif on this sizzling Saturday puts a smile on your face and guides you through the day.

Have a good one!

Photo credit: Lucas V. Barbosa via Wikimedia Commons

** FYP’s Pi-day post ( if you are interested )

Looping thunderstorm gifs by Mike Hollingshead

A sponge can’t soak up mercury. (Video) Facebook | Instagram | Scary Story Website

Centrifugal force and seat belts

The basic concept of a seatbelt is to protect you in an automobile collision by holding you in your seat. This prevents you from flying forward and colliding with the dashboard or windshield.

How do you do that ?

Many common seat belts design have something known as a centrifugal clutch. This arrangement has a weight attached to the end of a spool

When the spool rotates at a low speed, the weight is held through spring action and is allowed to spin freely.

But you must have noticed that if you try to pull the seat belt faster then it kinda gets stuck.

This is because as you rotate the spool faster, centrifugal force causes the weight to be pushed out and that stops the spool from rotating further.

This adds tension to your seat belt and holds you to your seat at the time of a crash. 

Have a great day!

* Other seatbelt mechanisms

** Seatbelt physics

Crazy Looking Bamboo Tower Creates 25 Gallons of Drinking Water Per Day From Thin air

This crazy looking tower creates 25 gallons of drinking water per day from thin air. It’s basically an atmospheric water collector which gathers dew from the air.

“…The 9 m tall bamboo framework has a special fabric hanging inside capable to collect potable water from the air by condensation…”

It’s called the WarkaWater:

“…The name ‘WarkaWater’ comes from the Warka Tree, a giant wild fig tree native to Ethiopia, traditionally used for public gatherings and school education. The Warka Tree is an archetype of the Biennale theme ‘Common Ground’…”

The simple and practical, yet elegant design powers out ahead of any of the commercial atmospheric water generators on the market which cost thousands more to build than this.

This is a wonderful water generation idea, that’s inexpensive, and actually beautiful to look at.

Water is life, and being designed after a tree. This is a real Tree of Life.

It’s a good Sunday. 🤗

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Experimental Saturday

Meet the ‘400k pie’

Banana whey protein bread

Interesting and fun stuff

Work vs Hobbies [Comic]

Use a Pencil to Freeze Sauce into Usable Portions

Bake the Perfect Pound Cake

Best Chocolate Chip Cookie Bake Off

Recipe lists

10 PUMPKIN SPICE FAVORITES

Ten Minute Meal Prep Recipes and Prep Ideas

10 DESSERTS AND COOKIES TO TRY FOR FALL

20 PUMPKIN RECIPES FOR FALL

25 APPLE RECIPES TO GET YOU READY FOR FALL

19 OF THE BEST EASY & HEALTHY ONE PAN MEALS

Our Favorite Pumpkin Recipes

Food days

Cheeseburger 🍔

Butterscotch Pudding

Rum Punch 🍹

Pecan Cookies

White Chocolate

Top recipes!

Classic Snickerdoodles

Fresh & Flavorful Strawberry Cake Recipe

Double Chocolate Brownies

RED VELVET SUGAR COOKIES RECIPE

BROWN SUGAR POUND CAKE

Ginger Fig Tart with Chestnut-Almond Crust {vegan & gluten-free}

RED VELVET MACARONS WITH CREAM CHEESE FROSTING

My Mom’s Homemade Spaghetti and Meat Sauce

APPLE FRITTER PANCAKES

Bacon Tomato and Spinach Spaghetti

PUMPKIN PIE SPICE PROTEIN SMOOTHIES

Apple Spice Ricotta Donuts

pumpkin gnocchi with sage butter sauce

Mashed Potato Fries

QUICK POTATO ROLLS

Follow for recipes

Get your FoodFfs stuff here

Blackest is the new black: Scientists have developed a material so dark that you can't see it...

Puritans, Goths, avant-garde artists, hell-raising poets and fashion icon Coco Chanel all saw something special in it. Now black, that most enigmatic of colours, has become even darker and more mysterious.

A British company has produced a “strange, alien” material so black that it absorbs all but 0.035 per cent of visual light, setting a new world record. To stare at the “super black” coating made of carbon nanotubes – each 10,000 times thinner than a human hair – is an odd experience. It is so dark that the human eye cannot understand what it is seeing. Shapes and contours are lost, leaving nothing but an apparent abyss.

NTU and JTC develop enhanced fire protection for steel

Credit: shutterstock/Anusorn Abthaisong

Scientists from Nanyang Technological University (NTU), Singapore, and national industrial developer JTC have unveiled what they are calling a 3-in-1 coating for better fire and corrosion protection.

‘In a fire, our coating forms a compact charred layer that acts as a protective barrier against the heat,’ explained Aravind Dasari, a Principal Investigator at the NTU–JTC Industrial Infrastructure Innovation Centre.

Called FiroShield, the coating functions like regular paint and is easy to apply, according to the research team. It can be applied on bare steel without the need for sand blasting, and provides protection against fire for two hours. 

Dasari explained, ‘While typical fire coatings will also form a charred layer, those are thick and foam-like, which can fall off easily and leave the steel exposed to the fire. What we aimed at was an innovative coat that works differently from conventional intumescent coatings and can stick to the steel surface for as long as possible under high temperatures, and yet has durability and weather resistance under normal conditions without a need for a top coat of paint.’

To find out more see the January issue of Materials World or visit  bit.ly/2nft8Z3

We started looking at fluctuating loads last time - that is, loads that feature some combination of non-zero mean and alternating stresses - and how to account for them using a Goodman diagram. Let’s re-examine the bracket design problem we did earlier. This time, instead of a fully-reversed load, we’ll assume a fluctuating load with a mean force of 200 lbs, a minimum force of 50 lbs, and a maximum force of 350 lbs. We’ll say the dimensions of the bracket are those we calculated earlier that could handle the fully reversed load. (Problem adapted from Machine Design: An Integrated Approach, 4th Ed., by Robert L. Norton.)

Most of the calculations we did earlier will still hold. We won’t need to recalculate the endurance limit or stress concentration factors. The only new things we need to do are calculate the mean and alternating stresses and the new safety factors.

First step is to calculate the mean and alternating force.

From here, we get the mean and alternating moment.

We’re dealing with a situation of simple bending, so we can calculate mean and alternating stress using the basic bending stress equation.

The geometry of the part hasn’t changed, so we’ll apply the same stress concentration factors that we used before.

Great. We’ve got our new stresses. Now we need to figure out safety factors. As we mentioned earlier, this is now a slightly more complicated proposition. Which safety factor is appropriate will depend on how the alternating and mean stress behave in relation to each other. The possible failure states are shown as points A, B, C, and D on the Goodman diagram for this situation.

We’ll step through all the possible situations one by one using the new stresses we calculated and the endurance limit we got earlier.

Case 1: Constant alternating stress, variable mean stress.

Case 2: Variable alternating stress, constant mean stress.

Case 3: Alternating and mean stress are proportional to each other.

Case 4: Alternating and mean stress vary independently.

We take the worse case, with the failure state F being as close as possible to the current stress situation.

Our design will survive all four cases. Note that Case 4 is always the most conservative case - if you don’t know what your stresses are going to do, this is the one to go with.

These giant mesh nets provide drinking water in the driest desert on Earth.