Rozenburg Windwall in the Netherlands

Rozenburg Windwall

Rozenburg is a small port town and former municipality in the west of the Netherlands, in the province of South Holland. After World War II, the port of Rosenburg developed rapidly from the Nieuwe Maas to the sea. In order to cope with the increasing volume of shipping traffic, a new shipping canal was built in the late 1960s, parallel to the existing Nieuwe Waterweg canal.

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

The Caland canal, named after the Dutch civil engineer who built the Nieuwe Waterweg, served ships with large drafts, in particular dry bulk carriers and tankers of increasing size, that were coming to Europoort. However, as the size of the ships increased, the wide canal soon became inconvenient to navigate during strong winds, in particular near the Calandbrug Bridge.

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

In the mid-1980s, architect Martin Strujis and artist Frans de Wit were commissioned to create an effective and at the same time good-looking windbreak. The result of their work was the Rozenburg Windwall.

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

The Rozenburg Windwall looks like a large-scale installation of landscape design and consists of 125 individual concrete slabs installed and made according to a certain pattern. They cover a length of 1.75 kilometers and reduce the wind force by 75%.

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

At the southern end of the canal the slabs are in the shape of semicircles – 18 meters wide and 25 meters long. However, closer to the Kalandbrugh Bridge the girths of the semicircular formations of the Wind Wall decrease, and each wall is located closer to the others.

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

Near the bridge, the walls are only 4 meters wide. In the north of the wall, the semi-circular slabs are replaced by cubic slabs of 10 meters, which are located on an embankment 15 meters high, achieving the same 25 meters as in the other sections. The barrier maintains this shape all the way to the end, where the gas reservoir is located among the trees.

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

Wrote (a) penssioner Today, 5:53 pm Saten and the Ural Mountains

I drove around the Netherlands with my wife as a tourist and understood why Peter the Great learned to build there – the guys really can! On land, on water, under water, pouring earth into the sea, pouring water in the center and digging something out under it – they can do it, they build in an enviable way. The best roads are not in Germany – there are potholes there occasionally, but I have not seen any in Holland. For example, let’s take The Hague: in the center of the city there is a park, near the park there is a canal and under the canal there is a parking lot with several stories. You put your car in a glass box and the car leaves to wait for you with the number you have on the ticket (see the picture). The automatics dump it the fuck off into the canal and it sails into the North Sea! Just kidding, of course, the elevator comes back to the owner, and he’s already dumping her into the sea.

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Rozenburg Windwall - Rozenburg Windwall Windwall, Wind barrier, Rozenburg, Longpost

We tilt it up a bit, put a turbine on top of it,

and we enjoy the cheap energy.

Rozenburg Windwall - Rozenburg Windwall Windwall, Wind barrier, Rozenburg, Longpost

Yeah, that’s what slows down the Earth’s rotation!

You should put one of those around Peter, pleas.

And we plant trees here. barbarians =)

I lived in Rosenburg for 2 months in 2015 (our firm rented us an apartment there in the beginning). Saw it and could not understand what it was for. Now I know. Picaboo is informative.

– You can seriously argue with that.

At least they would have written something on them.

Strange that they didn’t put turbines between them.

Rozenburg Windwall - Rozenburg Windwall Windwall, Wind barrier, Rozenburg, Longpost

A world of pink ponies.

Illustration for commentary

Onions in terms of physics

Once upon a time in a high school physics textbook I encountered a task – to describe a physical model of an onion. I don’t know what answer the writers planned to get, because, as you will see later in the post, an onion is not such a simple thing.

Let’s say we want to make an onion. And not just any onion, but a good onion. The first thing we will make sure is that the bow is tight.

The tighter the bow, the harder it will push the arrow. Of course, it will be difficult to stretch it. But this is a matter of practice.

At first glance it seems simple – you have to take a thicker stick. But let’s look at the bow from the side:

Pink Pony World.

And now let’s stretch it:

Pink Pony World.

It is easy to see that the outer side stretches and the inner side shrinks. And this effect is stronger the thicker our bow is:

Pink Pony World.

Wood can elastically deform – both stretching and compressing – only to a degree. After that, the fibers on the outside will start to burst, and on the inside they will go “in waves”. Of course, this is not good for anything.

We can’t stretch the bow very far – we need the force to last as long as possible. So what’s the solution? Make the bow itself as long as possible, so that the curvature is not so noticeable:

Pink Pony World.

That’s how you get a longbow. The most famous English longbow is from the 13th-14th century, but generally speaking, long bows have been around since the Paleolithic era. That’s understandable – taking a longer stick isn’t a goddamn invention.

Pink Pony World.

A bow from the Shnideyoch Pass (Alps) is dated 2900-2700 BC. It is 162 cm long – quite a longbow, considering the average height at the time.

However, the long bow has a number of disadvantages, the most significant of which is the difficulty of using it on horseback.

The Japanese made a clever bow with shoulders of different lengths – a short lower one and a long upper one:

Pink Pony World.

But the Central Asians of the steppe went the other way, inventing the composite bow. The outside consisted of animal veins, which stretched well, and the inside consisted of horn or bone, which shrank better. It is unclear whether the reason for this invention was the desire to strengthen the bow or the need to reduce the amount of scarce wood. But whatever the case, in the end they managed to get a fairly powerful and compact bow at the same time.

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The first composite bows were known in the times of the Scythians, and go back to the Neolithic. But its evolution was going on all the time of its existence, so that the Mongolian or Turkish bow was much more developed than the Scythian one.

Pink Pony World.

The Mongolian onion on the left and the earlier Gunn on the right

It is not difficult to notice that the steppe bow is characterized not only by its structure but also by its special shape including a reverse bend. In archery terminology, such a bow is called a recursive bow. Why is it necessary? Let’s get to the bottom of it.

If we take a straight (conventional) bow and start pulling it, the applied force will increase. Simply put, the harder we stretch, the harder it gets. You can draw a graph:

Pink Pony World.

So, the work done, or what’s the same, the accumulated potential energy, is the area under the graph:

Pink Pony World.

This is actually called a definite integral, but I don’t want to scare readers :)

As we can see, the picture is far from optimal. The ideal would be like this:

Pink Pony World.

It turns out that we need a bow that has the same applied force throughout.

This is exactly what the recursive bow is trying to achieve. When we pull it, the center part bends first. Then, as the force on the center part increases and the angle of the bowstring changes, the shoulders begin to bend and finally the ends themselves.

Pink Pony World.

Thus, the applied force changes within a smaller range and the graph becomes closer to the optimum:

Pink Pony World.

As a result, a recursive bow will be more efficient with the same pulling force.

And just pulling the bow with more or less constant force, in my humble onion experience, is somehow more pleasant. However, perhaps this is a matter of taste.

Now let’s see what happens when we lower the bowstring. Some of the potential energy will go into the kinetic energy of the arrow, but all of it?

Unfortunately, no. Even if we ignore losses such as heat, sound, and material fatigue, there is a purely mechanical loss. The point is that after the bowstring is dropped, the bow straightens, i.e. the shoulders of the bow come into motion. Movement = work = energy loss.

In that sense, the lighter the bow arms and the less they move, the less precious potential energy will be lost and the more of it will go into the motion of the arrow.

But that’s not all. Remember, in last week’s article it was discussed that hand throwing objects has a limited velocity, so no projectile will fly faster than your hand?

It’s the same problem with the bow. The straightening speed, while great, is still limited. And there is no way to make the arrow go faster, no matter how powerful the bow is.

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Both of these problems are solved by the block bow:

Pink Pony World.

First, most of the bow is static, with only the very ends of the shoulders bent, which means less loss of straightening.

Second, the blocks allow the arrow to get several times the speed of the shoulders straightening. It works as a polycoupler, only inversely – at the expense of loss in force we get gain in speed.

And at the same time the problem of constant pulling force is solved.

Modern block bows have a lot of devices that facilitate aiming and shooting: shelf, release (bowstring release device), sighting slat, all sorts of vibration absorbers. This allows modern sportsmen to reach the results that even the historic “Robin Hoods” could not dream of. However, this sports tool looks like a historical weapon only remotely.

Since the topic came up unexpectedly, I thought I would look at a couple more weapons. And for today, thank you for your attention.

The Lord of the Rings series

The first series of “The Lord of the Rings: Rings of Power” so far gets the worst ratings in the history of premium series in the twenty-first century.

So far, the viewer score is 2.7 out of 10 ♂

The Onion from a physics perspective Physics, The Onion, Sciencepop, Longpost

Who doubted it would?)

For good measure.

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Happy birthday to Kianca Reeves.

♪ On a good day... ♪

Babakin and customer centricity

Came across a post a week ago, about how our favorite knife maker (without sarcasm) messed up with the knife, which he forgot to sharpen and how he got out of this situation, well, I’ll tell you my story: Oh, just flashbacks …. Ordered a knife from Babakin in March, it was a birthday present from my wife. The order was made two months before the date, and the master promised to meet the deadline of 28 days (there were no problems with the material, all in stock). Did not hurry, once every 3 weeks to write a message that I have not been forgotten and further in anticipation. Worried 10 days before the day X. Babakin assured me that everything is normal and if anything he will just refund the money, etc. Two days before my birthday, after another reminder skimmed me track, well, of course, terms are screwed up and the master does not give a shit about me, but I’m waiting, cut this track still hanging in the mail system as assigned, but sending the post office is not accepted. A day after my birthday, I wrote in anger Babakin, that it is not worthy to behave this way and cheat me to put it mildly, and that he returned the money because the departure to the post office, but just remotely created the track, ok, returns….. listened to a story about SWO, negligent employee and the damn May holidays, which were so bad timing. I think ok, the money was returned, but I was waiting for 2 months for the knife (assuming that I should not have seen it in the process), not the wasted nerves and get the money back. I wrote to the master and asked him to send me a picture of the knife, and he sent me a beautiful pchak. I melted heart at what I saw, included the master excuses mode (the child was born, the May holidays, etc.) Ok, I say, finish it, send, money will pay. Waiting has begun, and the track and not beats, I say Babakin in 10 days, go to the post office to find out what’s up. Master writes: “Your knife was lost post office, I’ll make you the same one, and absolutely free, give me another month. Sin, happy at first, that the knife and get and the money will stay, but half of me saddled, badly said, for all you have to pay, I reasoned, but also said in advance the money did not go. Again, a month of waiting. The master writes that the knife is ready and will be sent in a minute. After another reminder to get the track and oh my god, it is tracked. I am waiting for the package like a child, it is still in the waiting room at the post office, and I am already sitting at the window, waiting. I take the package with trembling hands and rush to spouse, in my head long ago forgave the master for the mistakes. I tell my spouse, I’ll close my eyes, and you open it and hand it to me… the rustling of the package and her words, “And what is this….?” I felt like a kid who was promised a dandy for his birthday, and gave him a plastic gun without a trigger. Yes the knife, yes the pechak, but a different one, huge, crooked, with scratches and potholes on the blade and an incomprehensible bird. Which I did / remade was good and correct (judging by photos), according to my wishes, and this is a huge pchak with a lot of flaws … I immediately wrote all what I think the knife maker, to which he told me that this knife is a gift and for him to pay, that this work was done while he was young and I myself need to resharpen, although at that time Babakin invited himself to a free sharpening. So wait, and what you were re-sharpening my knife this month wait. You promised the same, well, according to the terms of reference! It turns out you were doing my head for a few months, and then pulled out of a dusty box illiquid, who the hell no one will buy who even know a little bit about knives. Well, I sent the money for the knife to the charity, because you always have to pay for the knife, which I told Babakin, and I can not take the knife in my hands, at first I wanted to throw it into the sea, but I changed my mind.

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I have it hanging on a magnet over the stove as a living reminder… What do we have in the end: 1-spoiled birthday present; 2-spoiled nerves; 3-knife, which I will never use. Yes, you can say, “What more do you want dog?”, got the knife for free. Only I didn’t ask for a free knife, I was very careful when choosing a master and a knife, and hoped to get a helper, but it turned out to be a hat. P.S. I didn’t want to make it public at all. And admirers of @Babakin’s work there are enough, but after reading the post just could not smolt. Enclose photo expected (in progress) and received. P.P.S. I wrote this post at night, just because of emotions. But unless we’re on Pikabu not in order to read posts and sometimes write.

Rozenburg is a small port town and former municipality in the west of the Netherlands, in the province of South Holland. After World War II, the port of Rosenburg developed rapidly from the Nieuwe Maas to the sea. In order to cope with the increasing volume of shipping traffic, a new shipping canal was built in the late 1960s, parallel to the existing Nieuwe Waterweg canal.

The Caland canal, named after the Dutch civil engineer who built the Nieuwe Waterweg, served ships with large drafts, in particular dry bulk carriers and tankers of increasing size, that were coming to Europoort. However, as the size of the ships increased, the wide canal soon became inconvenient to navigate during strong winds, in particular near the Calandbrug Bridge.

The Caland canal, named after the Dutch civil engineer who built the Nieuwe Waterweg, served ships with large drafts, in particular dry bulk carriers and tankers of increasing size, that were coming to Europoort. However, as the size of the ships increased, the wide canal soon became inconvenient to navigate during strong winds, in particular near the Calandbrug Bridge.

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In the mid-1980s, architect Martin Strujis and artist Frans de Wit were commissioned to create an effective and at the same time good-looking windbreak. The result of their work is the Rozenburg Windwall

Near the bridge, the walls are only 4 meters wide. In the north of the wall, the semi-circular slabs are replaced by cubic slabs of 10 meters, which are located on an embankment 15 meters high, achieving the same 25 meters as in the other sections. The barrier maintains this shape all the way to the end, where the gas reservoir is located among the trees.

Near the bridge, the walls are only 4 meters wide. In the north of the wall, the semi-circular slabs are replaced by cubic slabs of 10 meters, which are located on an embankment 15 meters high, achieving the same 25 meters as in the other sections. The barrier maintains this shape all the way to the end, where a gas reservoir is located among the trees.

Happy birthday to Kianca Reeves.

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