Kevin Lynagh

Kevin Lynagh

@kevinlynagh.com

I design and build things. Mostly software, sometimes furniture, and a few small buildings once. American in Amsterdam.

178 followers44 following23 posts

Kevin Lynagh reposted

Patrick Dubroy
@dubroy.com

Here it is — very happy to officially release the book that @marianoguerra.org and I have been working on for the past 2½ years. If you bought it in early access, thanks for your support! 🙏 If you haven't bought it yet, please check it out!!

WebAssembly from the Ground Up@wasmgroundup.com

Excited to announce the official launch of our online book, WebAssembly from the Ground Up! 🎉 It's the book we wish we'd had 3 years ago. No messing with tools and frameworks. It's a hands-on guide to the core of Wasm: the instruction set and module format. Link below. 👇

Kevin Lynagh
@kevinlynagh.com

Reading about superellipses and ran into an offhand reference to "squigonometry". I assumed it was a joke, then I found the Wikipedia page and a Springer textbook. I still can't tell.

Kevin Lynagh
@kevinlynagh.com

Need a fun holiday activity? Consider Reversibly Sticking Metals and Graphite to Hydrogels and Tissues. pubs.acs.org/doi/10.1021/...

pubs.acs.orgReversibly Sticking Metals and Graphite to Hydrogels and TissuesWe have discovered that hard, electrical conductors (e.g., metals or graphite) can be adhered to soft, aqueous materials (e.g., hydrogels, fruit, or animal tissue) without the use of an adhesive. The adhesion is induced by a low DC electric field. As an example, when 5 V DC is applied to graphite slabs spanning a tall cylindrical gel of acrylamide (AAm), a strong adhesion develops between the anode (+) and the gel in about 3 min. This adhesion endures after the field is removed, and we term it as hard–soft electroadhesion or EA[HS]. Depending on the material, adhesion occurs at the anode (+), cathode (−), or both electrodes. In many cases, EA[HS] can be reversed by reapplying the field with reversed polarity. Adhesion via EA[HS] to AAm gels follows the electrochemical series: e.g., it occurs with copper, lead, and tin but not nickel, iron, or zinc. We show that EA[HS] arises via electrochemical reactions that generate chemical bonds between the electrode and the polymers in the gel. EA[HS] can create new hybrid materials, thus enabling applications in robotics, energy storage, and biomedical implants. Interestingly, EA[HS] can even be achieved underwater, where typical adhesives cannot be used.

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