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The @…, in celebration of their 40th anniversary, has declared May to be the month in which enjoyers of free and open hardware and software will meet up at LibreLocal events. In that spirit, May 12th’s Tech Pizza Monday will host its own LibreLocal meetup! Same place and time as usual (Victory Cafe, 440 Bloor St. W., 6 PM). Demos are strongly encouraged!

Enhancing PySCF-based Quantum Chemistry Simulations with Modern Hardware, Algorithms, and Python Tools
Zhichen Pu, Qiming Sun
https://arxiv.org/abs/2506.06661

Enhancing PySCF-based Quantum Chemistry Simulations with Modern Hardware, Algorithms, and Python Tools
The PySCF package has emerged as a powerful and flexible open-source platform for quantum chemistry simulations. However, the efficiency of electronic structure calculations can vary significantly depending on the choice of computational techniques and hardware utilization. In this paper, we explore strategies to enhance research productivity and computational performance in PySCF-based simulations. First, we discuss GPU acceleration for selected PySCF modules. Second, we demonstrate algorithmi…

OpenCCA: An Open Framework to Enable Arm CCA Research
Andrin Bertschi, Shweta Shinde
https://arxiv.org/abs/2506.05129 https://arxiv.o…

OpenCCA: An Open Framework to Enable Arm CCA Research
Confidential computing has gained traction across major architectures with Intel TDX, AMD SEV-SNP, and Arm CCA. Unlike TDX and SEV-SNP, a key challenge in researching Arm CCA is the absence of hardware support, forcing researchers to develop ad-hoc performance prototypes on non-CCA Arm boards. This approach leads to duplicated efforts, inconsistent performance comparisons, and high barriers to entry. To address this, we present OpenCCA, an open research platform that enables the execution of CC…

HARNode: A Time-Synchronised, Open-Source, Multi-Device, Wearable System for Ad Hoc Field Studies
Philipp Lepold, Tobias R\"oddiger, Michael Beigl
https://arxiv.org/abs/2506.03219

HARNode: A Time-Synchronised, Open-Source, Multi-Device, Wearable System for Ad Hoc Field Studies
Research into human activity recognition (HAR) suffers from a lack of comprehensive, freely available field data. Commercial systems are rarely open source, offer little expandability, and have shortcomings in node synchronisation, data throughput, placement clarity, setup complexity, and cost. As a result, only a few intuitively placed sensors are often used, and field trials are generally reduced. HARNode addresses these obstacles as a fully open-source hardware and software platform for rapi…

Nosey: Open-source hardware for acoustic nasalance
Maya Dewhurst, Jack Collins, Justin J. H. Lo, Roy Alderton, Sam Kirkham
https://arxiv.org/abs/2505.23339

Nosey: Open-source hardware for acoustic nasalance
We introduce Nosey (Nasalance Open Source Estimation sYstem), a low-cost, customizable, 3D-printed system for recording acoustic nasalance data that we have made available as open-source hardware (http://github.com/phoneticslab/nosey). We first outline the motivations and design principles behind our hardware nasalance system, and then present a comparison between Nosey and a commercial nasalance device. Nosey shows consistently higher nasalance scores than the commercial device, but the magnit…

NELM: Modern Open-Source Software for Multipurpose Impedance Spectra Analysis
Natalia A. Boitsova, Anna A. Abelit, Daniil D. Stupin
https://arxiv.org/abs/2506.01997

NELM: Modern Open-Source Software for Multipurpose Impedance Spectra Analysis
Nowadays electrical impedance spectroscopy (EIS) has become an advanced experimental technique with a wide range of applications: from simple passive circuits diagnostics to semiconductor high-end device development and breakthrough technologies in bio-sensing. Although hardware for EIS today is well developed, the EIS analysis software is mainly custom, old fashioned, i.e. it is limited by features, does not utilize the progress in the modern computer science and hardware, and is usually imple…

The next Tech Pizza Monday is a Sticker Club edition! Bring your stickers to exchange, or just marvel in the stickers people do bring. The usual discussions of free and open software, free and open hardware, and free and open society will of course ensue! #Toronto #tech

Design and Analysis of Power Consumption Models for Open-RAN Architectures
Urooj Tariq, Rishu Raj, Dan Kilper
https://arxiv.org/abs/2505.24552 https://

Design and Analysis of Power Consumption Models for Open-RAN Architectures
The open radio access network (O-RAN) Alliance developed an architecture and specifications for open and disaggregated cellular networks including many elements that are being widely adopted and implemented in both commercial and research networks. In this paper, we develop transaction-based power consumption models of a centralized O-RAN architecture based on commercial hardware and considering the full end-to-end data path from the radio unit to the data center. We focus on recent fanout limi…

The next Tech Pizza Monday happens on the first Monday of the month, so you know what that means! That's right: Sticker Club! Bring your stickers and we will exchange them! Follow your heart and trade 1 for 1, or take one and promise to pass it along to a friend. As usual, the pizza is real, and we encourage hardware demos, especially if they're free and open. (The hardware, we mean.) April 7th, 6 PM, Victory Cafe, 440 Bloor St. W. Meet us at the sign!

​The Tech Pizza Monday meetup yesterday was so successful that we’re doing it again, you guessed it, next Monday! Come for the pizza and stay for the tech discussions. Got an open hardware demo? Cool! Those are the best! The more you believe in free and open software and hardware in service of a free and open society, the more you’re welcome to join us. The location is Victory Cafe, 440 Bloor St. W., Toronto, ON. The start time is 6 PM.
RSVP is not required, or even encouraged, frankl…

We are Toronto’s GrapheneOS, Qubes OS, Linux, and free and open software and hardware weekly meetup! Join us this coming Monday when we will talk about those things and how they relate to a free and open society. As usual, there will be pizza! The next meetup is March 24th starting at 6 PM, Victory Cafe, 440 Bloor St. W. RSVP! Or not! Just look for the sign when you get there. #Toronto

Be sure to vote our Election Night Edition this upcoming Monday, as the polls close at 9:30 PM. Then, come for the pizza and stay for the tech discussions. We don’t know if the venue (Victory Cafe, 440 Bloor St. W.) will turn on the TVs for election results. We usually adjourn before that time, anyway. The festivities start at 6 PM!
Got a hardware demo? Cool! Those are the best! The more you believe in free and open software and hardware in service of a free and open society, the more …

Toronto’s best pizza-themed tech meetup, not to mention the best tech-themed pizza meetup, happens tomorrow. Same time as usual (6 PM), same place as usual (Victory Cafe, 440 Bloor St. W.), same day of the week as usual (Monday). If you have a free and open hardware demo, we will shower you with attention! RSVP, or don’t, at the Luma link! #Toronto

Victory Cafe is open today, which is Victoria Day! So we will hold Tech Pizza Monday tonight! #Toronto #tech #pizza

Hey hey! We’re still doing Tech Pizza Mondays. We understand there’s a certain conference in town, one that rhymes with “blanimé sporth”, so if you’re a part of that, join us tomorrow! #Toronto #tech #pizza

Last night’s Tech Pizza Monday was amazing, assumes whoever is posting to this account, who wasn’t there. We’re looking forward the next one on, you guessed it, Monday night at 6 PM Victory Cafe, 440 Bloor St. W. #Toronto #tech