Hidden Math in Pearls Reveal Their Remarkable Strength (Natural Treasure Contains the Secret) - Popular Mechanics

hovden · 2022-08-31T03:38:39+00:00

Link to the relevant peer reviewed article: https://www.pnas.org/doi/10.1073/pnas.2107477118

hovden · 2022-08-23T01:17:58+00:00

My interpretation is similar to the OP's. This book is clearly discussing metaphysical laws that are outside physical interpretation. Easy to find / google discussions of the Trial focus on the more superficial parody of bureaucracy (which is also fascinating).

hovden · 2022-08-22T20:43:55+00:00

Right on. Not a high-tilt holder, which limits the angular range which projections can be acquired, which in turn limits the quality of the 3D reconstruction. The mechanics of sample rotation using the goniometer are the same.

hovden · 2022-08-22T20:39:56+00:00

Direct link to manuscript (no paywall, CC license): https://www.nature.com/articles/s41467-022-32046-0

hovden · 2022-08-22T20:33:28+00:00

Direct link to manuscript (no paywall, CC license): https://www.nature.com/articles/s41467-022-32046-0

hovden · 2022-08-12T03:16:05+00:00

Transmission electron microscopes rotate specimens using a complex goniometer that drives geared mechanical motion. High-angle rotation is fundamental to electron tomography; a 3D imaging technique that reveals nanoscale structure in all dimensions. In this video the mechanics of rotational motion inside a high-resolution transmission electron are shown from a vantage not often seen.

hovden · 2022-08-08T21:28:39+00:00

Real time tomography is integrated into tomviz, an open source and cross platform 3D analysis tool that contains intuitive graphical user interfaces (GUI) to enable any scientist to characterize biological and material structure in 3D.

hovden · 2022-08-04T01:18:05+00:00

From Article: We demonstrate real-time tomography with dynamic 3D tomographic visualization to enable rapid interpretation of specimen structure immediately as data is collected on an electron microscope. Using geometrically complex chiral nanoparticles, we show volumetric interpretation can begin in less than 10 minutes and a high-quality tomogram is available within 30 minutes. Real-time tomography is integrated into tomviz, an opensource and cross-platform 3D data analysis tool that contains intuitive graphical user interfaces (GUI), to enable any scientist to characterize biological and material structure in 3D.

hovden · 2022-05-12T00:55:58+00:00

Quote: "The study (https://www.pnas.org/doi/10.1073/pnas.2107477118), focuses on nacre’s structure at the nanoscale level—lengths of a billionth of a meter, even smaller than a wavelength of light. Using an electron microscope, the researchers noticed that inconsistencies in the nacre’s brick-and-mortar structure led to “corrections” in future layers. When an asymmetrical nacreous layer corrupted the pearl’s symmetry, future layers “adjusted” their thicknesses to make the pearl more spherical."

hovden · 2022-05-12T00:52:43+00:00

Quote: "The study, published in Proceedings of the National Academy of Sciences, focuses on nacre’s structure at the nanoscale level—lengths of a billionth of a meter, even smaller than a wavelength of light. Using an electron microscope, the researchers noticed that inconsistencies in the nacre’s brick-and-mortar structure led to “corrections” in future layers. When an asymmetrical nacreous layer corrupted the pearl’s symmetry, future layers “adjusted” their thicknesses to make the pearl more spherical."

hovden · 2022-01-28T14:59:03+00:00

I can help. In most of the images, the dots (e.g. Fig 3) are atoms. In many materials atoms are periodically arranged, so you see an array of dots. It's remarkable we can resolve and image atoms using electron beams. This manuscript is about identifying which element on the periodic table each dot belongs to.

hovden · 2022-01-21T02:34:58+00:00

From manuscript: "The stabilization of ordered electronic phases with 2D polytype engineering has significant implications for routes to access fragile, exotic correlated electron states."

hovden · 2021-10-29T00:50:29+00:00

From the manuscript: "Regarding layered growth of nanomaterials, of course, external templates are limited and rare. Mesoscale periodicity—defined here as long- range translational order of mesoscopic building blocks—is thus improbable, due to natural variations in the unit sizes, without the aid of some additional countervailing mechanism. The rare instances where nature assembles mesoscale periodicity therefore merit our attention”

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