Tsinghua University

Effect of Grain-Boundary Discontinuous Precipitation Evolution on the Transition of Creep-Rupture Failure Modes in Ni–Fe-Based Alloy/Inconel 617 Dissimilar Welded Joints

The creep-rupture behavior and microstructural evolution of Ni–Fe-based alloy/Inconel 617 dissimilar welded joints were investigated by creep-rupture testing, interrupted creep testing, and microstructural characterization. Tests were conducted at 630–750 °C under stresses of 130...

Effects of TiO2/ZrO2 Ratio on Microstructure, Mechanical Properties and Metallization Performance of 95 Al2O3 Ceramics

Alumina (Al2O3) ceramic sealing rings have attracted considerable attention in power battery packaging applications due to their excellent chemical stability, electrical insulation, and mechanical properties. In this study, 95% Al2O3 ceramics were fabricated using a CaO–SiO2–TiO2...

Topological Engineering of Perylene Diimide-Based Metallacycles through Multicomponent Self-Assembly for Fluorescence Sensing of Picric Acid

Abstract The rational construction of discrete supramolecular architectures with controlled topological complexity remains a significant challenge in coordination-driven self-assembly. Herein, we report a modular multicomponent self-assembly strategy for the construction of a hom...

Thermochemical Polarization-Driven Heterolytic Hydrogenation in an Electrochemical Palladium-Membrane Reactor

Abstract Heterolytic hydrogenation via hydride species transfer represents a fundamental transformation in industry for chemical synthesis, but H2 or organic hydride donors are often utilized as the hydrogen source. An electrochemical palladium (Pd) membrane reactor shows the abi...

Mapping the Excited State Dynamics of Gas-Phase Spiropyran with Time-Resolved Photoelectron Spectroscopy

Abstract We report a femtosecond time-resolved photoelectron spectroscopic study of the excited state dynamics of spiropyran (SP3mt) in the gas phase. Using 266 nm pump and 200 nm probe pulses with an overall instrument response function of 160 fs, the experiment directly resolve...

Three-dimensional reconfigurable magnetic microswarms with boundary-transcending capabilities

Swarm behaviors are prevalent in nature and have inspired many engineering designs. However, achieving artificial swarms capable of reversibly migrating through fluids against gravity and transcending physical boundaries, such as solid–liquid and liquid-air interfaces, remains ch...

Temperature field prediction based on a 3D-U-net model

The solidification process of castings involves intricate physical transformations and is critical in the final quality of castings. The temperature field during solidification serve as fundamental indicators for defect prediction and process optimization. Conventional approaches...

Seasonal predictability of winter PM 2.5 pollution severity in India through a strong pollution–extratropical storm connection

India suffers from severe fine particulate matter (PM 2.5 ) air pollution in winter that harms public health and disrupts economic activities. Seasonal prediction of pollution severity could facilitate proactive mitigation planning but is hindered by incomplete understanding of t...

Increased receptor binding and spike glycosylation, remodeled immune escape of surging SARS-CoV-2 subvariant BA.3.2.2/RE.2.2/Cicada

SARS-CoV-2 continues to evolve. The subvariant BA.3.2 (Cicada), a derivative of the Omicron BA.3 subtype first detected in late 2024, harbors multiple spike protein mutations, ORF7 and ORF8 deletions, and has recently evolved sublineages (BA.3.2.1 and BA.3.2.2), rendering it a cr...

Increasing risk of vapor pressure deficit exceeding critical thresholds for tree growth

With global warming, rising atmospheric vapor pressure deficit (VPD) has emerged as a critical driver of vegetation productivity and the terrestrial carbon sink. Yet, the thresholds beyond which VPD constrains tree growth remain poorly quantified. Using 2,953 tree-ring sites and...

PIK3CA promotes hepatic tumor growth through evasion of phagocyte-mediated anti-tumor immunity

Both primary and metastatic liver cancers are highly lethal diseases, for which effective treatment options remain limited. The unique hepatic microenvironment provides a niche that enables tumor cells to evade immune surveillance. To identify factors that mediate tumor growth wi...

Electrolyte materials and interfacial engineering for high-energy-density aqueous potassium-ion batteries

Abstract Aqueous potassium-ion batteries (AKIBs) have emerged as highly attractive candidates for grid-scale energy storage due to their intrinsic safety, low cost, and fast ion transport kinetics. However, their practical deployment is severely impeded by insufficient energy den...

Series-Connected Grid-Following and Grid-Forming Hybrid Control Strategy for VSC-HVDC Converters to Enhance Transient Voltage Stability in Receiving-End Power Grids

With an increase in the High-Voltage Direct Current (HVDC) infeed, the strength of the receiving-end AC grid decreases, leading to transient voltage instability. Voltage source converter (VSC)-HVDC stations have a large unit capacity and high controllability, offering great poten...

A cU-Net-based surrogate model for predicting rough surface contact parameters in line-contact friction

Abstract Accurate and efficient prediction of contact parameters on rough surfaces is critical for the tribological design, condition monitoring, and failure analysis of line-contact components. Although physics-based models offer high prediction fidelity, their multi-field coupl...

From Molecular Designs to Nanomaterials for Electrochemical PFAS Detection: A Review

Abstract The pervasive occurrence of per- and polyfluoroalkyl substances (PFAS) and the implementation of stringent regulatory guidelines necessitate rapid, highly sensitive analytical methodologies. Although liquid chromatography-tandem mass spectrometry (LC-MS/MS) remains the g...

Guns for butter: Trade effects of arms transfers

Abstract Using a global dyadic panel from 1950 to 2021, we find a positive association between arms transfers from an exporter to an importer and general goods exports to that partner. The effects are short‐run: export responses peak around the transfer and fade within a few year...

Layer-Controlled Intermolecular Coupling and Many-Body Effects in C60 Films

Abstract Crystalline C60 is a molecular solid whose electronic properties emerge from the interplay of intermolecular hopping, electron correlations, and electron–vibration coupling. Unlike moiré van der Waals heterostructures, where the interaction strength is commonly tuned by...

The Eventual Exact Value of g₅(n) in the Choi–Erdős–Szemerédi Pairwise-Sums Problem

This record contains a preliminary computer-assisted proof that g5(n) = 4 for every integer n >= 2^64, in the version of the Choi–Erdős–Szemerédi pairwise-sums problem where the five summands are distinct integers and may be non-positive. Different pairs may have the same sum. Th...

Decreased mechanosensitivity and metabolic reprogramming impair bone regeneration in type II diabetes: core mechanism and targeted scaffold design

Abstract Background Bone regeneration in individuals with type 2 diabetes mellitus (T2DM) is significantly impaired, even when autologous bone grafts are used. However, previous studies have failed to elucidate the physiological mechanism, and effective treatments are lacking. Th...

Metabolic Engineering Strategies for High-Level α-Pinene Production in Saccharomyces cerevisiae

Abstract α-Pinene is a biologically active monoterpene compound derived from coniferous plants, performing multiple ecological and physiological functions. Moreover, its strained bicyclic skeleton makes it an exceptional renewable feedstock for high-density renewable fuels. Howev...