The University of Tokyo

Optimality of Quasi-Monte Carlo Methods and Suboptimality of the Sparse-Grid Gauss–Hermite Rule in Gaussian Sobolev Spaces

Abstract. Optimality of several quasi-Monte Carlo methods and suboptimality of the sparse-grid quadrature based on the univariate Gauss–Hermite rule are proved in the Sobolev spaces of mixed dominating smoothness of order [Formula: see text], where the optimality is in the sense...

Quiescence to proliferation transition regulates asynchronous mitochondrial DNA replication dynamics

Each human cell contains hundreds to thousands of mitochondrial DNA (mtDNA) copies, only a small fraction of which replicates independently of the cell cycle. An asynchronous replication of the leading and lagging strands has been proposed to represent a major replication mode in...

Age-and sex-specific variation in diet quality across the lifespan and its lifestyle and socio-demographic determinants in Japan

Variations in diet quality across the lifespan remain insufficiently characterised, particularly in non-Western populations. We aimed to examine age-and sex-specific variation in diet quality and identify associated dietary components and socio-demographic and lifestyle factors i...

Automatic Termination Strategy of Inelastic Neutron-scattering Measurement Using Bayesian Optimization for Bin-width Selection

Currently, an excessive amount of event data is being obtained in four-dimensional inelastic neutron-scattering experiments. A method for automatic bin-width optimization of multidimensional histograms has been developed and recently validated on real inelastic neutron-scattering...

Trace Amines Scavenge Terpenoid-Derived Criegee Intermediates at Air–Liquid Interfaces to Form Atmospheric Organic Nitrogen

Abstract Organic nitrogen (ON) represents a chemically diverse fraction of atmospheric aerosols that profoundly modulates particle aging, toxicity, and light absorption. However, the exact kinetic pathways and timing of interfacial ON formation remain poorly constrained. Utilizin...

Characteristics of quasi‐stationary band‐shaped precipitation systems in Japan between 1989 and 2022

Abstract Quasi‐stationary band‐shaped precipitation systems (QBPSs) are the major cause of localized heavy‐rainfall events (HREs) in Japan. Using hourly radar/raingauge‐analysed precipitation amounts from 1989 to 2022, we statistically examined the occurrence characteristics of Q...

Seismic and tsunami hazard potential of the Negros–Sulu megathrust, Philippines

Abstract. The Negros–Sulu megathrust poses an imminent threat to coastal communities surrounding the Sulu Sea, but with limited information on past tsunamis, megathrust geometry, and locked segments, robust seismic and tsunami hazard assessments are hindered. To identify highly e...

In-flight receiver calibration of the Ganymede Laser Altimeter (GALA) by passive Earth observations

Abstract. Post-launch characterization of the receiver telescope of the laser altimeter is essential for achieving precise georeferenced planetary measurements and for radiometric calibration to passively measure surface reflectance. For the Ganymede Laser Altimeter (GALA) aboard...

A putative nursery pollination mutualism between Japanese Chrysosplenium plants and Nipponorhynchus sawflies

Societal Impact Statement Understanding ecological interactions is increasingly important for biodiversity conservation. This study reveals a unique nursery pollination mutualism between Japanese endemic plants and sawflies. These partners exhibit tightly synchronized life cycles...

Resolution Dependence of the Climate Feedback Parameter in Km‐Scale Climate Models

Abstract Global storm‐resolving models (GSRMs) provide new opportunities to investigate the climate response to warming with explicitly resolved deep convection. However, the limited number of existing studies has so far precluded the systematic assessment of similarities and dif...

Neglected carbonation effect on moisture profiles in hardened cement paste during short-term drying

This study investigates the influence of atmospheric CO₂ on moisture transport during drying in cementitious pastes with different microstructures, namely ordinary Portland cement (OPC), volcanic glass powder (VGP), and limestone-calcined clay cement (LC 3 ) pastes. To isolate th...

From traffic-flow capacity to recovery capacity: An episode-based framework for multi-sector urban resilience

Urban systems experience disruptions that differ in magnitude, duration, and final recovery outcome. Existing resilience measures commonly emphasize performance loss, recovery duration, or trajectory area, but they do not directly represent the peak rate at which a disrupted syst...

What happens to wavepackets of fermions when scattered by the Maldacena-Ludwig wall?

A bstract We study wavepackets of exotic excitations after two-dimensional fermions are scattered by the boundary condition constructed by Maldacena and Ludwig, which turns elementary excitations into exotic fractionally-charged objects. They are of interest in the s-wave approxi...

Unveiling the Chasm in Japanese robot-assisted surgery diffusion: the interplay of surgical volume and intra-specialty spillover

To examine structural factors associated with the diffusion of robot-assisted surgery (RAS) in Japan, this study examined the associations of annual surgical volume, defined as the sum of open, conventional laparoscopic, and RAS cases, and prior intra-specialty experience with ad...

Depressive and Anxiety Symptoms in Vestibular Migraine and Probable Vestibular Migraine

ABSTRACT Introduction It has been previously reported that patients with vestibular migraine (VM) are more prone to anxiety and depressive symptoms. However, the association between the pathophysiology of VM and anxiety and depressive symptoms is still unclear. This study aimed t...

Intrinsic Defect Energetics and Fluorine Doping Effects in Li2CO3 and Li2O2: A First-Principles Study

Abstract Lithium carbonate, Li2CO3, is a thermodynamically stable carbonate phase whose defect energetics are closely related to its stability and decomposition behavior in various lithium-based electrochemical systems. These properties of Li2CO3 are particularly important in lit...

Unlocking low overpotential and fast reaction kinetics for high-performance Li-CO2 batteries via single-atom-tailored MoN2

Li-CO 2 batteries suffer from high overpotential and sluggish kinetics, calling for efficient cathode catalysts to enhance their charge-discharge performance. Transition metal nitrides have attracted wide attention owing to their high conductivity, good mechanical strength and ex...

Electrochemical Ammonia Oxidation Catalyzed by Ruthenium Complexes Bearing 4,4’-Substituted Bipyridine Dicarboxylate Ligands

Abstract We have examined electrochemical ammonia oxidation catalyzed by ruthenium complexes bearing 4,4’-substituted 2,2’-bipyridine-6,6’-dicarboxylate (bda) ligands and axial isoquinoline ligands. Bulk electrolysis revealed that a ruthenium complex bearing 4,4’-dimethyl substit...

Fourier Neural Operator-based surrogate modeling of offshore tsunami propagation and its application to rapid tsunami source inversion

The accurate and rapid estimation of tsunami sources immediately after an earthquake is essential for real-time tsunami forecasting. Recent advances in offshore tsunami observation networks have made it increasingly feasible to estimate tsunami sources from observed waveforms usi...

Self-Catalyzed Hastelloy Fiber Paper (HAP) Porous Transport Layer for Oxygen Evolution Reaction in Anion Exchange Membrane Water Electrolysis

Abstract Hastelloy fiber paper (HAP) can be used as the oxygen evolution reaction porous transport layer (PTL) without using a catalyst layer in anion exchange membrane water electrolysis. It is combined with Ru on nickel fiber paper (NFP) (hydrogen evolution reaction PTL) to for...