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@mcdanlj@social.makerforums.info
2025-06-01 02:25:20

Baby's first unun!
My #AmateurRadio journey continues with making some of my own equipment...
I wanted to be able to connect either an EFHW or an EFRW to my KX3, but move the actual antenna away from the radio, so that I can POTA with other people close enough to talk, while keeping the antennas for the different out of each others' near field so they don't interere. To …

Partially-assembled unun. A nut on the upper right is connected to the coax shield, and is connected to a brass screw on the right for a counterpoise connection. A blue 100pf capacitor is in the upper left of a purple 3d-printed box, connected between ground and the center terminal of the input. At the bottom, the 6th turn is tapped and run to another brass screw which provides the 9:1 random wire connection. A strand of red magnet wire goes up to the upper left over the blue capacitor; it conn…
The internals of the unun with kapton tape covering the torroid, and the 49:1 antenna connection brass screw in the lid at the upper left.
The assembled unun with two wires attached. At the top is a wire next to a ground symbol on the side of the 3d-printed box. This wire is the counterpoise. On the lower right is another wire connected to the side of the box. This is the random wire connected to the 9:1 antenna connection. At the lower left, in the middle of the lid, is the antenna connection for an end-fed half-wave antenna. Each of the terminals uses a heat-set insert as a finger nut to connect the antennas.
@arXiv_condmatmtrlsci_bot@mastoxiv.page
2025-06-30 09:31:30

Wurtzite AlScN/AlN Superlattice Ferroelectrics Enable Endurance Beyond 1010 Cycles
Ruiqing Wang, Feng Zhu, Haoji Qian, Jiuren Zhou, Wenxin Sun, Siying Zheng, Jiajia Chen, Bochang Li, Yan Liu, Peng Zhou, Yue Hao, Genquan Han
arxiv.org/abs/2506.22212

Wurtzite AlScN/AlN Superlattice Ferroelectrics Enable Endurance Beyond 1010 Cycles
Wurtzite ferroelectrics are rapidly emerging as a promising material class for next-generation non-volatile memory technologies, owing to their large remanent polarization, intrinsically ordered three-dimensional crystal structure, and full compatibility with CMOS processes and back-end-of-line (BEOL) integration. However, their practical implementation remains critically constrained by a severe endurance bottleneck: under conditions where the remanent polarization (2Pr) reaches or exceeds 200 …

@NFL@darktundra.xyz
2025-05-30 17:20:48

Lions' Dan Campbell excited to be 'scarred up' at end of tough 2025 schedule: 'It's the right kind of brutal' nfl.com/news/lions-dan-campbel

Lions' Dan Campbell excited to be 'scarred up' at end of tough 2025 schedule: 'It's the right kind of brutal'
Lions head coach Dan Campbell knows Detroit must start from scratch on its newest Super Bowl quest, a journey made more difficult by a grueling schedule, but he's excited for the season ahead.

@arXiv_astrophEP_bot@mastoxiv.page
2025-06-04 07:48:12

Predictions of the LSST Solar System Yield: Discovery Rates and Characterizations of Centaurs
Joseph Murtagh, Megan E. Schwamb, Stephanie R. Merritt, Pedro H. Bernardinelli, Jacob A. Kurlander, Samuel Cornwall, Mario Juri\'c, Grigori Fedorets, Matthew J. Holman, Siegfried Eggl, David Nesvorn\'y, Kathryn Volk, R. Lynne Jones, Peter Yoachim, Joachim Moeyens, Jeremy Kubica, Drew Oldag, Maxine West, Colin Orion Chandler

Predictions of the LSST Solar System Yield: Discovery Rates and Characterizations of Centaurs
The Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) will start by the end of 2025 and operate for ten years, offering billions of observations of the southern night sky. One of its main science goals is to create an inventory of the Solar System, allowing for a more detailed understanding of small body populations including the Centaurs, which will benefit from the survey's high cadence and depth. In this paper, we establish the first discovery limits for Centaurs throughout th…