Hacker News Reader

jf___on A chemical reaction in ancient Roman concrete makes it stronger over time (2017)

A material science professor at TU Delft [1] and this material is commercially available [2].

From the abstract of `Bacteria-Based Self-Healing Cementitious Composite for Application in Low-Temperature Marine Environments` [3]: "The composite displayed an excellent crack-healing capacity, reducing the permeability of cracks 0.4 mm wide by 95%, and cracks 0.6 mm wide by 93% following 56 days of submersion in artificial seawater at 8 ◦C. Healing of the cracks was attributed to autogenous precipitation, autonomous bead swelling, magnesium-based mineral precipitation, and bacteria-induced calcium-based mineral precipitation in and on the surface of the bacteria-based beads. "

[1] https://www.tudelft.nl/citg/over-faculteit/afdelingen/materi...

[2] https://www.basiliskconcrete.com/hoe-werkt-het/?lang=en

[3] doi:10.3390/biomimetics2030013

jf___on OpenJSCAD

no, CadQuery is a wrapper on top of PythonOCC

jf___on OpenJSCAD

PythonOCC [1] wraps the OpenCASCADE kernel and is easily installed through conda:

conda install -c dlr-sc pythonocc-core=7.4.0

[1] https://github.com/tpaviot/pythonocc-core

jf___on Dispatch – Open-source release of Netflix's crisis management framework

Fun to see `sentry.io` as one of the dependencies, kind of an interesting level of recursion on an incident mgmt app

jf___on Jupyter Notebooks to Web App

A mature implementation exists, called voilà, see https://github.com/voila-dashboards/voila, which is developed by members of the Quantstack.

jf___on Fangle: create interactive documents from plain text

impressive, the quality of the documents is stunning, especially when you think of the potential for didactic / documentation purposes.

https://mathisonian.github.io/trig/etymology

jf___on Ask HN: What tasks do you automate?

carving up marble with industrial robots

https://vimeo.com/94076571

Cad -> robot code compiler is built on top of pythonocc

jf___on True3DGlass: A Revolution in Glass Processing

extruding glass as in the MIT project is very different then from printing material that is then thrown into an oven. the resulting piece has really different properties I imgagine

jf___on Enaml: A declarative UI library with a Cassowary layout system for Python

TraitsUI was a cool idea, but not implemented that well. Enaml carries it to perfection. I love how enaml provides a ton of functionality, while it doesnt get in the way of experimentation. Just see the matplotlib widget [1] how easy it is to integrate other widgets.

[1] https://github.com/nucleic/enaml/blob/master/enaml/widgets/m...

jf___on Enaml: A declarative UI library with a Cassowary layout system for Python

the live demo ( ~23:40 ) is cool and insightful of what enaml provides