Chrüsimüsi

  • 37 Posts
  • 12 Comments
Joined 1 year ago
cake
Cake day: July 6th, 2023

help-circle

























  • Angular momentum is a measure of an object’s rotation around a point (#spin) 🌪️.

    Centripetal force is the force that keeps an object moving in a circular path, always pointing towards the center (#holdingtight) 🎯.

    One is about spinning momentum, the other about the force directing that spin.

    In this example:

    As you shoot the water jet at the skateboard wheel, you are continuously adding angular momentum to the wheel. This increases the wheel’s rotational speed.

    As the wheel spins faster and faster, the individual particles in the wheel experience a greater centripetal force, pulling them towards the center of the wheel’s rotation. However, at the same time, due to the increased rotational speed, the particles also experience a greater centrifugal force (which is not a real force but an apparent force observed in a rotating reference frame), pushing them outwards.

    At a certain point, this outward “force” (centrifugal effect) becomes too great for the material of the wheel to withstand, overcoming the cohesive forces holding the wheel together, and it starts to expand and eventually breaks.

    This being said, I’m not sure if that’s actually correct what I just wrote, so take it all with a grain of salt (as one should do anyway when reading something online…)





  • An academic book about emojis that can’t include emojis? That’s ironic and frustrating. Makes me sad that we live in a world where copyright hinders education and discussion 🙈

    Here is a Tl;Dr for the ones who don’t want to click the link:

    Oxford professor Jieun Kiaer published an academic book called “Emoji Speak: Communications and Behaviours on Social Media,” exploring how emojis are used across different cultures and ages, and considering their future in digital communication.

    Although the book discusses emojis in detail, Kiaer was unable to include actual images of many emojis due to copyright concerns, despite the fact that these symbols are ubiquitous in social media spaces, which are almost entirely copyright-free.

    Instead of using actual emojis, Kiaer hired an artist, Loli Kim, to draw similar representations, illustrating the barriers that exist between the online and offline worlds concerning copyright.

    The inability to use emojis in the book, even in an academic context, highlights the complications and absurdity of modern copyright laws, which some argue could have constituted a fair use situation.


  • I wonder if this technique can be expanded to other eye conditions 🤔

    Here is a Tl;Dr for the ones which don’t want to click the link:

    Researchers at Anglia Ruskin University in the UK have used 3D nanotechnology to successfully grow human retinal cells, offering a new way to treat age-related macular degeneration (AMD), a leading cause of blindness.

    AMD is categorized into two types: ‘dry’ and ‘wet,’ both of which cause vision loss due to the destruction or deterioration of the retina’s RPE cells.

    The team used electrospinning, a novel technique in this context, to create a 3D nanofibrous scaffold, composed of two polymers, which served as a base for growing the RPE cells. An anti-inflammatory coating was applied to the scaffold, enhancing the growth and functionality of the cells, which remained healthy and viable for up to 150 days.

    This innovative approach could lead to effective treatments for sight conditions like AMD, and the researchers are now focusing on transplanting these freshly grown cells into the human eye.