Tootfinder

I'm pretty happy with the top side Samtec ARF6 launch simulations now.
S11:
* Red: No cutout, -12 dB at 10 GHz, -7 at 20 GHz, -4.8 at 30 GHz
* Blue: Rectangular ground cutout the size of the pad, -22.5 at 10 GHz, -16.4 at 20 GHz, -11.7 at 30 GHz
* Green: 30um larger than the pad on all sides (1.06 x 0.41 mm), -30.5 at 10 GHz, -22 at 20, -15 at 30.
With the oversized cutout it's more than good enough for QSGMII and 25Gbase-R.
TDR:
* Red: No cutou…

Mathematical proof concerning the additivity problem of nonlinear normalized citation counts
Xing Wang, Zhihui Zhang
https://arxiv.org/abs/2508.14595 https://

Mathematical proof concerning the additivity problem of nonlinear normalized citation counts
The issue of whether nonlinear normalized citation counts can be added is critically important in scientometrics because it touches upon the theoretical foundation of underlying computation in the field. In this paper, we provide rigorous mathematical proofs for the key theorems underlying this fundamental issue. Based on these proofs, we ultimately arrive at the following conclusion: a nonlinear normalization method for citation counts must be a non-equidistant transformation; consequently, th…

I've got a 3am start with derpmaster Mike coming up in the next few days. He normally gets up at 5.30am so I've got a feeling there's going to be no settling him after I arrive and his regular humans all leave.
Still, hot weather will mean an early walk and breakfast and then we can both snooze!
My fourth year of looking after Michael.
#Greyhounds

Top adviser to supreme leader dies in hospital following Israeli attack
Ali Shamkhani, Iran’s top adviser to its supreme leader, Ayatollah Khamenei,
has died in the hospital a day after Israel launched airstrikes across the country.
Shamkhani had previously served as Iran’s top national security official for a decade and had represented Iran in the China-facilitated rapprochement talks with Saudi Arabia

The first American ‘scientific refugees’ arrive in France
https://www.politico.eu/article/meet-first-academic-refugees-fleeing-us-france-science-program/?utm_sou…

Impact of particle-size polydispersity on the quality of thin-film colloidal crystals
Mariam Arif, Andrew B. Schofield, Fraser H. J. Laidlaw, Wilson C. K. Poon, Job H. J. Thijssen
https://arxiv.org/abs/2507.13258

Impact of particle-size polydispersity on the quality of thin-film colloidal crystals
Size polydispersity in colloidal particles can disrupt order in their self-assembly, ultimately leading to a complete suppression of crystallization. In contrast to various computational studies, few experimental studies systematically address the effects of size polydispersity on the quality of colloidal crystals. We present an experimental study of structural order in thin films of crystals vertically dried from colloidal dispersions with a systematically varying polydispersity. As expected, …

The first American 'scientific refugees' arrive in France (Victor Goury-Laffont/Politico)
https://www.politico.eu/article/meet-first-academic-refugees-fleeing-us-france-science-program/
http://www.memeorandum.com/250701/p4#a250701p4

On Friday, Trump’s border czar,
Tom Homan, said he plans to send the National Guard to Los Angeles
to combat protests against ICE that began this weekend following immigration raids in the city.
“We are making Los Angeles safer. Mayor Bass should be thanking us. She says they are going to mobilize—guess what?
We are already mobilizing.
We are going to bring the National Guard in tonight,”
Homan told Fox News.
California Governor Gavin Newsom respo…

LA protests live: National Guard to arrive within 24 hours after being deployed by Trump over immigration demos
Demonstrators clash with Immigration and Customs Enforcement (ICE) officials in hours-long stand-off

Computational Complexity of Model-Checking Quantum Pushdown Systems
Deren Lin, Tianrong Lin
https://arxiv.org/abs/2506.18439 https://…

Computational Complexity of Model-Checking Quantum Pushdown Systems
In this paper, we study the problem of model-checking quantum pushdown systems from a computational complexity point of view. We arrive at the following equally important, interesting new results: We first extend the notions of the {\it probabilistic pushdown systems} and {\it Markov chains} to their quantum analogues and investigate the question of whether it is necessary to define a quantum analogue of {\it probabilistic computational tree logic} to describe the probabilistic and branching-…

On Gy\'arf\'as' Path-Colour Problem
Ben Cameron, Alexander Clow
https://arxiv.org/abs/2506.19100 https://arxiv.org/pdf/25…

On Gyárfás' Path-Colour Problem
In their 1997 paper titled ``Fruit Salad", Gyárfás posed the following conjecture: there exists a constant $k$ such that if each path of a graph spans a $3$-colourable subgraph, then the graph is $k$-colourable. It is noted that $k=4$ might suffice. Let $r(G)$ be the maximum chromatic number of any subgraph $H$ of $G$ where $H$ is spanned by a path. The only progress on this conjecture comes from Randerath and Schiermeyer in 2002, who proved that if $G$ is an $n$ vertex graph, then $χ(G) \le…