It’s great amateur radio. Which I’ve learned is not about reliable communication. It is the sport of “can you here me now?”. Lots of tinkering and testing. The fun of Seeing the network open up when someone attaches a node to an airplane. Or occasional conversations that pop up. Set expectations low and get into appreciating direct EM wave communication.
If I might also plug ‘the Atlas of Fourier Transforms’. If your interested in understanding building intuition of symmetry and phase in fourier space, the book illustrates many structures.
Some context for HN: This is a self-published book, which is nonstandard in my field. Usually you work with large academic publishing groups. The choice of self-publishing is an unknown process to most academics in science and engineering. It afforded me an opportunity to learn more about publishing, bookmaking, marketing, and distribution. Self-publishing allows the author to retain creative control on how the book is made, presented, and shared.
I know HN is interested in academic publishing policies, copyright, DRM, etc. This project presents an alternative for researchers to share knowledge.
The “Atlas of Fourier Transforms” caters to enthusiasts of all proficiency levels. Here, the reader embarks into the world of Fourier transforms through carefully curated images of Fourier pairs. As the atlas unfurls, it includes concepts of symmetry, rotation, translation, addition, multiplication, and interference. For those well-versed in the art of Fourier analysis, ”The Atlas of Fourier Transforms” offers an unparalleled dictionary of structures and their corresponding Fourier counterparts.
The article does not explain how they entered it into the public domain. One cannot just declare something is public domain. Public domain is a special circumstance.
Blatant fraud is rare in physics, engineering, chemistry. Lying is rare. Quality is high at the highest institutions of physics and chemistry. Exaggerated claims occur, but much less than in day to day life. Top visibility work is quickly reproduced. Reproduction is the essence of science.
The algorithm is made available; may be of interest to HN comp sci community. Fused multi-modal electron tomography reconstructs three-dimensional chemical models by solving an optimization problem seeking a solution that strongly agrees with (1) the HAADF modality containing high SNR, (2) the chemically sensitive spectroscopic modality (EELS and/or EDX), and (3) encourages sparsity in the gradient domain producing solutions with reduced spatial variation.
Measuring the three-dimensional (3D) distribution of chemistry in nanoscale matter is a longstanding challenge. Here, high-resolution 3D chemical imaging is achieved near or below one-nanometer resolution. Multi-modal data fusion enables high-resolution chemical tomography often with 99% less dose by linking information encoded within both elastic (HAADF) and inelastic (EDX/EELS) signals. We thus demonstrate that sub-nanometer 3D resolution of chemistry is measurable for a broad class of geometrically and compositionally complex materials.
A lot of non-quantum waves have discrete allowed values. EM cavities, guitar strings, etc. Quantum waves are described by a special wave equation, actually a complex diffusion equation (first order in time, second order spatially).
Headline is misleading. Waterbears are quite fragile, albeit tougher than most. I bought some and found nearly all would die after short exposure to low vacuum. Manuscripts seem to corroborate our findings. It is the exaggerated headlines that lead me to believe they are indestructible.
I’ve yet to have ChatGPT produce useable content for my technical writing, or even lighter portions of proposal writing, rec letters, emails etc. I found it has done well at cleaning up text, fun language games, and quickly sourcing readily available information. I don’t think 2023 is the year books are replaced (maybe low novelty blogs). I feel a disconnect with how GPT is being exalted, and my underwhelming experience for useable content.