Tootfinder

Characterizing the neutron component of extensive air showers with the Surface-Scintillator Detectors of AugerPrime
Tobias Schulz (for the Pierre Auger Collaboration)
https://arxiv.org/abs/2507.17318

Characterizing the neutron component of extensive air showers with the Surface-Scintillator Detectors of AugerPrime
Neutrons are the only neutral hadrons that remain stable over the timescale of an air-shower development. Their energy is lost only through hadronic interactions and quasi-elastic scattering, which results in their high abundance at the ground. The signals from the electromagnetic and muonic components in scintillation detectors typically span only a few microseconds. In contrast, the neutrons can cause delayed pulses in scintillation detectors up to and beyond several milliseconds after the pa…

Die #Batterie ist zentrale Schlüsseltechnologie der #Elektromobilität.
Doch aktuell dominieren asiatische Hersteller die gesamte #Wertschöpfungskette – von der

Starke Batterieindustrie, starker Automobilstandort
Neun Thesen zum Ausbau der Batterieproduktion für Elektromobilität in Deutschland und Europa

Negative capacitance overcomes Schottky-gate limits in GaN high-electron-mobility transistors
Asir Intisar Khan, Jeong-Kyu Kim, Urmita Sikder, Koushik Das, Thomas Rodriguez, Rohith Soman, Srabanti Chowdhury, Sayeef Salahuddin
https://arxiv.org/abs/2506.16758

Negative capacitance overcomes Schottky-gate limits in GaN high-electron-mobility transistors
For high-electron-mobility transistors based on two-dimensional electron gas (2DEG) within a quantum well, such as those based on AlGaN/GaN heterostructure, a Schottky-gate is used to maximize the amount of charge that can be induced and thereby the current that can be achieved. However, the Schottky-gate also leads to very high leakage current through the gate electrode. Adding a conventional dielectric layer between the nitride layers and gate metal can reduce leakage; but this comes at the p…

A solvable microscopic model for the propagation of light in a dielectric medium
Richard Dengler
https://arxiv.org/abs/2506.17415 https://

A solvable microscopic model for the propagation of light in a dielectric medium
This work examines a dielectric medium consisting of small, polarizable classical atoms arranged on a cubic lattice. Using a regularized variant of the discrete dipole approximation (DDA) method, we derive the solution for the propagation of light in this medium in the long wavelength limit. Under typical conditions, the atoms remain effectively stationary, but acquire momentum. The analytical solution is used to calculate the mechanical contribution to the the signal momentum from the electrom…

Unveiling two-dimensional electron systems on ultra-wide bandgap semiconductor $\mathrm{\beta}$-Ga$_2$O$_3$
Ryu Yukawa, Hiroshi Mizuseki, Suryo Santoso Putro, Y\'e-Jin L. Lee, Yuuki Masutake, Hinako Telengut, Boxuan Li, Hajime Yamamoto, Tadashi Abukawa, Junya Yoshida, Vladimir V. Kochurikhin, Taketoshi Tomida, Masanori Kitahara, Takahiko Horiai, Akira Yoshikawa, Nobuhiko Sarukura, Noriko Chikumoto, Toshihiko Shimizu, Marilou Cadatal-Raduban, Yoshiyuki Kawazoe, Ryuhei Kohno, Hiroshi…

Unveiling two-dimensional electron systems on ultra-wide bandgap semiconductor $\mathrmβ$-Ga$_2$O$_3$
Ultra-wide bandgap (UWBG) semiconductors promise to revolutionize power electronics, yet a fundamental understanding of their interfacial electronic structure has been hindered by the absence of direct experimental observation. Here, we report the first momentum-resolved observation of two-dimensional electron systems on a UWBG material, enabled by angle resolved photoemission spectroscopy (ARPES) on high-purity $β$-Ga$_2$O$_3$ single crystals. Alkaline-metal-induced electron doping forms an i…

Characterization of downward Terrestrial Gamma-ray Flashes detected at the Pierre Auger Observatory
Roberta Colalillo (for the Pierre Auger Collaboration), Joseph Dwyer, John Ortberg, David M Smith
https://arxiv.org/abs/2507.15669

Characterization of downward Terrestrial Gamma-ray Flashes detected at the Pierre Auger Observatory
Downward Terrestrial Gamma-ray Flashes (TGFs) are sub-millisecond bursts of MeV gamma rays produced in thunderclouds. According to the Relativistic Runaway Electron Avalanche model, gamma rays are produced, via bremsstrahlung, from electron cascades activated by a relativistic "seed" electron. It is not clear what mechanism is responsible for the acceleration of electrons to relativistic energies in electric discharges. To better understand the acceleration sites and the TGF production mechanis…

Self-Supervised Distillation of Legacy Rule-Based Methods for Enhanced EEG-Based Decision-Making
Yipeng Zhang, Yuanyi Ding, Chenda Duan, Atsuro Daida, Hiroki Nariai, Vwani Roychowdhury
https://arxiv.org/abs/2507.14542

Self-Supervised Distillation of Legacy Rule-Based Methods for Enhanced EEG-Based Decision-Making
High-frequency oscillations (HFOs) in intracranial Electroencephalography (iEEG) are critical biomarkers for localizing the epileptogenic zone in epilepsy treatment. However, traditional rule-based detectors for HFOs suffer from unsatisfactory precision, producing false positives that require time-consuming manual review. Supervised machine learning approaches have been used to classify the detection results, yet they typically depend on labeled datasets, which are difficult to acquire due to t…

I don’t agree in one respect:
Neither OOP nor FP (nor 4GLs nor IDEs nor SOAs nor any of the other new hotnesses past) had anything remotely resembling the current money behind them. None led to companies speculatively laying off tens of thousands of employees for imagined productivity boosts that had not actually arrived yet. None shaped whole election cycles, or led to national proposals for preemptive deregulation. None led to the construction of nuclear power plants or the draining of rivers. None sent oligarchs or fascists into spasmodic wet dreams of world domination. None started quasi-religious cults like EA.
All •that• is the part that feels like blockchain — but even worse, if such a thing is possible.
@…
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Toward an African Agenda for AI Safety
Samuel T. Segun, Rachel Adams, Ana Florido, Scott Timcke, Jonathan Shock, Leah Junck, Fola Adeleke, Nicolas Grossman, Ayantola Alayande, Jerry John Kponyo, Matthew Smith, Dickson Marfo Fosu, Prince Dawson Tetteh, Juliet Arthur, Stephanie Kasaon, Odilile Ayodele, Laetitia Badolo, Paul Plantinga, Michael Gastrow, Sumaya Nur Adan, Joanna Wiaterek, Cecil Abungu, Kojo Apeagyei, Luise Eder, Tegawende Bissyande

Toward an African Agenda for AI Safety
This paper maps Africa's distinctive AI risk profile, from deepfake fuelled electoral interference and data colonial dependency to compute scarcity, labour disruption and disproportionate exposure to climate driven environmental costs. While major benefits are promised to accrue, the availability, development and adoption of AI also mean that African people and countries face particular AI safety risks, from large scale labour market disruptions to the nefarious use of AI to manipulate public o…

Enhancing Neutron Measurement Accuracy with Bubble Detectors at Laser-Driven Neutron Sources
Stefan Scheuren, Maria Angeles Mill\'an-Callado, Jonas Kohl, Tim T. J\"ager, Markus Roth, Christian R\"odel, Aaron Alejo, Florian Kroll, Karl Zeil, Arnd Junghans, Carlos Guerrero, Benedikt Schmitz
https://arxiv.org/abs/2508.14463

Enhancing Neutron Measurement Accuracy with Bubble Detectors at Laser-Driven Neutron Sources
Bubble detectors are widely used to measure neutron flux from laser-driven sources employing a pitcher-catcher setup, due to their insensitivity to intense $γ$-ray backgrounds and strong electromagnetic pulses (EMP).\\ This paper presents a method to account for the neutron energy-dependent response of bubble detectors, enabling accurate conversion of bubble counts into neutron flux at the detector location. The proposed method is based on the accurate reconstruction of the response function u…