Acta Energiae Solaris Sinica•2026•DOI: 10.19912/j.0254-0096.tynxb.202608_9683
This study addresses the inherent volatility and uncertainty in photovoltaic (PV) power generation by proposing a short-term forecasting model that integrates fuzzy C-means (FCM) clustering, hybrid scale feature extraction (HSFE), and a multi-head dynamic sparse attention (MDSA) mechanism within a bidirectional gated recurrent unit (BiGRU) framework. The methodology begins with preprocessing historical PV data, including outlier removal via boxplot analysis and feature selection using Pearson correlation coefficients. Principal component analysis (PCA) reduces dimensionality, followed by FCM clustering to classify weather patterns. The clustered data feeds into a BiGRU model augmented with HSFE to capture multi-scale temporal dependencies, while MDSA dynamically adjusts focus on critical time steps. Comparative simulations demonstrate that the proposed FCM-BiGRU-HSFE-MDSA model achieves superior accuracy and generalization across diverse climatic conditions. The integration of HSFE and MDSA mitigates noise, enhances robustness, and reduces overfitting, offering a reliable tool for intelligent dispatch in PV systems. The model's performance validates its effectiveness for short-term PV power forecasting, providing a novel pathway for improving operational scheduling in renewable energy grids.
Environmental Chemistry•2026•DOI: 10.7524/j.issn.0254-6108.2025010306
Sulfur autotrophic denitrification (SAD) has attracted increasing attention due to its low cost, no need for external carbon sources, and low sludge production. This review systematically examines the reaction principles and key material elements of various electron donors for SAD, including elemental sulfur, sulfide, thiosulfate, and iron sulfide. It discusses recent research progress on different SAD processes and the influence of environmental factors. A comparative analysis between heterotrophic denitrification and SAD highlights SAD's advantages in reaction rate, secondary pollution, and cost-effectiveness, underscoring its promising application prospects. Notably, iron sulfide-based autotrophic denitrification maintains stable pH and produces fewer by-products (e.g., sulfate, nitrous oxide). When developed into an aggregate sulfur concrete system, it can purify nitrogen and phosphorus from secondary effluent standards to Class IV surface water standards within a hydraulic retention time of only 0.5–2 hours, addressing the contradiction between SAD reaction rate and engineering demands. This enables efficient simultaneous nitrogen and phosphorus removal, making it viable for groundwater remediation, advanced wastewater treatment, eutrophication control, and deep nitrogen removal. The national 'Dual Carbon Strategy' (carbon neutrality and peak) positions SAD as a promising method for wastewater treatment plants to meet increasingly stringent nitrogen and phosphorus discharge standards.
Environmental Chemistry•2026•DOI: 10.0000/202605-1
A method for the determination of hydrazoic acid and sodium azide in workplace air was established using ion chromatography with suppressed conductivity detection. Vapor and mist states of hydrazoic acid were collected in 40 mg·L−1 KOH absorption solution, while sol states of hydrazoic acid or sodium azide were collected on microporous membranes and eluted with 40 mg·L−1 KOH. Separation was performed on a Dionex IonPac™ AS11-HC (250 mm × 4.0 mm) anion analytical column with KOH gradient elution, followed by suppressed conductivity detection. The azide ion (N3−) exhibited good linearity in the range of 0.005–0.5 mg·L−1, with a correlation coefficient (r) of 0.9997. The limit of detection (S/N=3) was 0.002 mg·L−1, and the limit of quantification (S/N=10) was 0.005 mg·L−1. The minimum quantifiable concentrations in air were 0.00256 mg·m−3 for hydrazoic acid and 0.00387 mg·m−3 for sodium azide, based on a 10.0 mL sample solution and a 20 L air sample. Spiked recoveries ranged from 92.0% to 100.4%, with relative standard deviations (RSD, n=6) between 0.76% and 2.51%. The method is efficient, accurate, and sensitive, suitable for monitoring and safety assessment of hydrazoic acid and sodium azide in workplace air.
Journal of Fuel Chemistry and Technology•2026•DOI: 10.1016/S1872-5813(25)60618-9
Aromatic hydrocarbons, essential chemical feedstocks for fuels, synthetic fibers, and pharmaceuticals, are predominantly derived from petroleum refining. The catalytic conversion of lignin, a major lignocellulosic component, offers a renewable route to these chemicals. This review systematically examines the influence of pyrolysis methods, catalysts, and reaction conditions on the catalytic pyrolysis of lignin to aromatic hydrocarbons. Key parameters include catalyst acidity and pore structure, which govern selectivity and yield. Reaction temperature, catalyst-to-lignin ratio, and residence time critically affect product distribution. The review outlines catalytic mechanisms, such as deoxygenation, cracking, and aromatization, and highlights the role of zeolite catalysts, particularly HZSM-5, in enhancing monocyclic aromatic hydrocarbon yields. Metal modification (e.g., Fe, Ni, Ga) and pretreatment strategies (e.g., torrefaction) are discussed for improving efficiency. Challenges remain in catalyst deactivation due to coking and the complexity of lignin structure. Future research directions include developing robust catalysts, optimizing reactor designs, and integrating processes for industrial viability. This review provides theoretical and technological guidance for advancing lignin-to-aromatics conversion.
SCIENCE CHINA Materials•2026•DOI: 10.1007/s40843-026-4332-3
This correction addresses an error in the affiliations of the authors of the article 'Intrinsic pseudocapacitive Na0.44MnO2 prepared by novel ion-exchange method for high rate and robust sodium-ion batteries' originally published in Science China Materials, volume 66, issue 10, 2023, pages 3810–3816. In the original publication, one affiliation of the first author (Yuge Cao) was missing, and the affiliations of the authors were incorrectly labeled. The corrected affiliations are as follows: Yuge Cao is affiliated with the State Key Laboratory of High-Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; the Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China; and the Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China. The other authors' affiliations are also corrected accordingly. The corresponding authors are Hui Bi ([email protected]) and Fuqiang Huang ([email protected]). This correction does not affect the scientific content of the original article.
SCIENCE CHINA Materials•2025•DOI: 10.1007/s40843-025-3395-4
Magnetic transition metal dichalcogenides (TMDs) offer intrinsic spin polarization for spintronic devices, yet ferromagnetic TMDs remain scarce. The theoretically predicted nontrivial topological 1T NbTe2 is thermodynamically unstable relative to the 1T′ phase under ambient conditions, impeding its spintronic application. Heteroatom doping can stabilize the 1T phase and introduce magnetism. We synthesized Nb1−xCrxTe2 (x = 0, 0.1, 0.2, 1/3, 0.4) crystals and discovered the 1T Nb2/3Cr1/3Te2 phase. Cr doping induces a 1T′-to-1T structural transition in NbTe2. Density functional theory confirms the thermodynamic stability of 1T Nb2/3Cr1/3Te2. Magnetic measurements reveal a transition from diamagnetic to ferromagnetic behavior with increasing Cr content. The ferromagnetism in 1T Nb2/3Cr1/3Te2 originates primarily from localized Cr 3d electrons, achieving a Curie temperature (TC) of 254 K, surpassing most Cr-based van der Waals ferromagnets. The compound exhibits metallic behavior coexisting with the Kondo effect and a positive magnetoresistance of 32.1% at 2 K under μ0H = 9 T. This work unveils a doping-induced phase transition mechanism and provides a new layered ferromagnetic material for spintronic devices.