Northeast Normal University

Domino effect enables dynamic electronic structure evolution for stable and efficient water purification

The purification of water contaminated by persistent organic pollutants remains a critical global challenge, largely due to the intrinsic trade-off between high catalytic activity and long-term stability in advanced oxidation processes. Despite the tremendous potential of single-...

Resource translocation facilitates restoration of saline-alkali degraded grasslands by altering resource acquisition of dominant species

Clonal functional traits such as physiological integration (resource translocation between connected individuals) can promote the performance of clonal plants and modify their environments. Such performance promotion of dominant clonal plants may help restore degraded communities...

Piezoelectric-Actuated Flexible Undulating Fins for Biomimetic Surface Robot Propulsion: Design, Modeling, and Experimental Evaluation

Small unmanned surface vehicles operating in confined, vegetation-rich, or ecologically sensitive waters require compact propulsion systems that minimize entanglement and unintended contact. Here, we present a 178 mm biomimetic surface robot propelled by bilateral flexible fins a...

Low-intensity fire-derived pyrogenic carbon decouples methane and carbon dioxide production in aerobic and hypoxic layers of permafrost peatlands

Wildfire frequency is increasing in high-latitude permafrost peatlands, leading to the input of pyrogenic carbon (PyC) into the active layer. The effect of PyC on the critical greenhouse gases CH 4 and CO 2 production in the active layer (aerobic and hypoxic) is poorly constraine...

AI investment (In)congruence and innovation resilience in knowledge-intensive firms: unpacking the boundary role of knowledge structure

Purpose Drawing on the knowledge-based view (KBV), this study aims to deconstruct firm-level artificial intelligence (AI) investment into a supply-demand structure to examine how the (in)congruence between supply-side AI investment (SAI) and demand-side AI investment (DAI) affect...

Locking Broadband Bi 3+ Luminescence Color From 6 to 423 K

ABSTRACT Wide‐temperature color‐stable luminescence is a critical requirement for high‐performance phosphor‐converted light‐emitting diodes (pc‐LEDs). However, broadband emitters, particularly Bi 3+ ‐activated phosphors, universally suffer from thermally induced spectral drift. T...

Regime shifts in shallow lakes: Modeling nonlinear feedbacks in submerged macrophyte-epiphyte-snail system

A three-dimensional dynamical model is formulated to investigate the interactions among submerged macrophytes, epiphytes, and snails in shallow lake ecosystems. The model incorporates key processes such as shading effect, selective grazing behavior, and nonlinear predation pressu...

Guanidinium-Induced Intermolecular Hydrogen-Bonding Networks: An Effective Strategy for Achieving Superprotonic Conductivity in Molybdenum–Oxygen Clusters

Abstract As a class of inorganic clusters with precisely tunable structures, polyoxometalates (POMs) demonstrate great potential in the field of proton-conducting materials due to their inherent proton-transfer sites and functionalizable surface properties. In this study, utilizi...

In-Situ Synthesis of CuF2 Integrated Cathodes for High-Performance Lithium Metal Batteries with Superb Stability

Abstract Copper fluoride (CuF2) exhibits high theoretical specific capacity and an attractive redox potential, making it a promising lithium metal batteries (LMBs) cathode material. Nevertheless, its cycling performance remains inadequate, with severe capacity loss occurring over...

Multiscale Structural Engineering of a Wearable Gas Sensor for Simulated Breath Ammonia Monitoring Under High‐Humidity Conditions

ABSTRACT Wearable gas sensors capable of monitoring volatile biomarkers in exhaled breath offer a promising approach for non‐invasive health monitoring. However, existing wearable sensors are hindered by insufficient sensitivity, limited selectivity, and pronounced humidity inter...

Programmable solar‐blind ultraviolet sensors enabling integrated single‐pixel sensing and neuromorphic processing

Abstract The physical segregation of sensing and processing in conventional architectures creates bottlenecks for real‐time vision, necessitating systems that mimic biological vision by first rapidly capturing images and then performing complex processing. Here, we report a multi...

Gain-switched all-fiber 3.5 μm laser with high pulse energy

We report the demonstration of an all-fiber pulsed laser at 3.5 μm based on gain-switching scheme. The cavity, formed by splicing two fiber Bragg gratings to a piece of Er-doped fluoride fiber, is dual-wavelength pumped by a pulsed 2 μm fiber laser and a continuous-wave 0.98 μm l...

The interactive influence of service recovery agent and language style on consumer forgiveness: mediation of perceived sincerity

Purpose This study aims to examine how the interaction between service recovery agent (human vs robot) and language style (formal vs informal) affects consumer forgiveness and investigates the mechanisms and boundary conditions of this effect, grounded in complementary fit theory...

Bollobás–Nikiforov conjecture holds asymptotically almost surely

Bollobás and Nikiforov (J. Combin. Theory Ser. B. 97 (2007) 859-865) conjectured that for a graph G that is not complete, with e ( G ) edges and the clique number ω ( G ) , then λ 1 2 + λ 2 2 ≤ 2 e ( G ) 1 − 1 ω ( G ) , where λ 1 and λ 2 are the largest and the second largest eig...

Endurance exercise and central fatigue

Background: Endurance exercise, characterized by sustained low-to-moderate intensity training, enhances physiological performance during prolonged physical activity and is widely used in sports training and the rehabilitation of chronic diseases. Central fatigue, a key issue in e...

Catalytic Shunt for Sustainable Photosynthesis of Hydrogen Peroxide from Hypersaline Organic Wastewater

Abstract Photosynthetic hydrogen peroxide (H2O2) production from organic wastewater offers a sustainable alternative to the energy-intensive anthraquinone process, yet it is severely hindered by rapid quenching of reactive precursors by concentrated salts in hypersaline organic w...

The nature of science in Chinese senior secondary geography textbooks under the context of sustainable development: Identifying the gaps and seeking reform

Within the context of sustainable development, UNESCO has recognized geography as a core discipline for advancing education for sustainable development. Addressing complex sustainability issues calls for geography education to make visible how geographical knowledge is produced,...

Mechanistic insights into HipA‐mediated bacterial persistence: Role of initial cellular states and toxin expression kinetics

Abstract Persistent bacteria subpopulations showing multidrug tolerance pose significant challenges to antibiotic therapy. While the HipBA toxin–antitoxin (TA) system is known to play a role in persister formation, existing studies predominantly focus on its kinase activity and i...

Small mammalian herbivores at moderate densities facilitate livestock growth by improving vegetation composition in grasslands

Small mammals and large herbivores have co-evolved in grasslands for millions of years, yet how they interplay remains unclear. Although large herbivores can significantly affect the smaller ones, the reversal effect is largely unknown. On the Qinghai–Tibetan Plateau, plateau pik...

Stereoselective polysubstituted bicyclo[1.1.0]butane synthesis by rhodium-catalyzed kinetic resolution

Bicyclo[1.1.0]butanes (BCBs) are a distinctive class of strained small-ring carbocycles of growing importance in synthetic and medicinal chemistry. However, the enantioselective synthesis of polysubstituted BCBs remains a largely unsolved challenge. Herein, we report a general ch...