Category Painting

What is the “wall of humanity”?

The Wall of Humanity' is a noble initiative where people leave their old clothes, toys, books, furniture and other usable household items near a designated wall which may later be collected by the needy. The concept originated in Iran in 2015. At the time, Iran's economy was in bad shape and people with limited means were finding it tough to deal with the harsh Iranian winter. That's when some youths in the city of Mashhad came up with the idea of helping the poor in a manner which would not make them feel embarrassed.

"Leave what you don't need, take what you do"

They began to hang their old clothes on the city walls and it soon became a trend known as 'Deewar-e-Meherbani. A similar campaign was started in Pakistan by a young boy, which came to known as 'Deewar-e-Insaniyat. It included donations of food, clothes, medicines and books for the needy.

In India this concept first immerged in form of 'Neki ki Deewar in Bhilwara, Rajasthan. Today, similar such walls of humanity have sprung up in dozens of Indian cities including Mumbai, Chandigarh, Mysore, Allahabad, Pune, Nagpur, Nashik, Aurangabad, Bhopal.  

Picture Credit : Google

What is a 3D printed robotic hands?

Researchers have succeeded in printing robotic hands with bones, ligaments and tendons for the first time. Using a new laser scanning technique, the new technology enables the use of different polymers.

Additive manufacturing or 3D printing is the construction of a 3D object from a 3D digital model. The technology behind this has been advancing at great pace and the number of materials that can be used have also expanded reasonably. Until now, 3D printing was limited to fast-curing plastics. The use of slow-curing plastics has now been made possible thanks to a technology developed by researchers at ETH Zurich and a MIT spin-off U.S. start-up, Inhabit. This has resulted in successfully 3D printing robotic hands with bones, ligaments and tendons. The researchers from Switzerland and the U.S. have jointly published the technology and their applications in the journal Nature.

Return to original state

 In addition to their elastic properties that enable the creation of delicate structures and parts with cavities as required, the slow-curing thiolene polymers also return to their original state much faster after bending, making them ideal for the likes of ligaments in robotic hands.

The stiffness of thiolenes can also be fine-tuned as per our requirements to create soft robots. These soft robots will not only be better-suited to work with humans, but will also be more adept at handling delicate and fragile goods.

Scanning, not scraping

In 3D printers, objects are typically produced layer by layer. This means that a nozzle deposits a given material in viscous form and a UV lamp then cures each layer immediately. This method requires a device that scrapes off surface irregularities after each curing step.

While this works for fast-curing plastics, it would fail with slow-curing polymers like thiolenes and epoxies as they would merely gum up the scraper. The researchers involved therefore developed a 3D printing technology that took into account the unevenness when printing the next layer, rather than smoothing out uneven layers. They achieved this using a 3D laser scanner that checked each printed layer for irregularities immediately.

This advancement in 3D printing technology would provide much-needed advantages as the resulting objects not only have better elastic properties, but are also more robust and durable. Combining soft, elastic, and rigid materials would also become much more simpler with this technology.

Picture Credit : Google 

WHAT IS VAN GOGH SELF- PORTRAIT DISCOVERY?

It has been found on the reverse side of one of his painting, hidden behind glue and cardboard. Vincent van Gogh was a Dutch painter, generally considered to be the greatest after Rembrandt van Rijn, and one of the greatest of the Post-Impressionists. He sold only one artwork during his life, but in the century after his death he became perhaps the most recognized painter of all time.

The sensational discovery was made when an x-ray image was taken of Van Gogh’s Head of a Peasant Woman” (1885) in advance of a forthcoming Impressionism exhibition at the Scottish National Gallery in Edinburgh, the U.K.

Currently, the self-portrait is covered by layers of glue and cardboard believed to have been applied to the reverse of “Head of a Peasant Woman” before being framed for an exhibition held in Amsterdam around 1905. Experts are researching to see if they can uncover the self-portrait, but warn that removing the glue and cardboard will require delicate conservation work to avoid harming the painting on the other side It’s believed Van Gogh painted the self-portrait after he moved to Paris and was exposed to the work of French Impressionists.

“Head of a Peasant Woman”, which shows a local woman from the town of Nuenen in the Netherlands, was donated to the National Gallery of Scotland collection in 1960 by a prominent Edinburgh lawyer. It will feature in the “A Taste for Impressionism” exhibition on The Mound in Edinburgh on till November 13, 2022, together with an illuminated copy of the x-ray image.

Picture Credit : Google