齐齐哈尔大学

Escalating climate volatility, particularly the El Ni & ntilde;o/Southern Oscillation (ENSO), poses severe operational and financial risks to corporate sustainability in the energy sector. However, quantitative evidence regarding how macro-level climate shocks transmit to micro-level operational performance remains scarce. Integrating dynamic capability and social network theories, this study analyzes a panel of 103 Chinese listed energy firms (2005-2022) using System GMM, mediation, and moderation models. The results indicate that ENSO intensity significantly impairs performance; specifically, a 1 degrees C rise in sea surface temperature anomalies decreases firms' return on assets (ROAs) by 0.142%. We identify supply chain resilience as a critical strategic mechanism for climate adaptation, where response capacity acts as the dominant mediating channel, while recovery capacity functions as an independent compensatory mechanism. Conversely, supply network complexity-across horizontal, vertical, and spatial dimensions-amplifies the negative impact of climate disruptions by hindering resource mobility. Heterogeneity analysis reveals that state-owned enterprises exhibit stronger institutional resilience, and firms in southern regions partially offset impacts through hydropower advantages. This study bridges climate science with operations management, offering strategic guidance for managers to configure resilient, sustainable supply chains capable of withstanding environmental turbulence.

The hollow structure of transition metal selenides can significantly boost the energy storage capability thanks to their attractive two-dimensional nanostructure and large exposed surface area. In this study, the heterostructured NiSe2/MoSe2/NF microspheres with cavity structure were obtained via a hydrothermal selenization process. The duration of the selenization process significantly affected both the electrode materials' morphology and capacity properties. Electrochemical testing conveyed that the NiMoSe-6 microspheres (NiSe2/MoSe2) treated with selenium for 6 h were the best, measuring 275 mAh g(-1) at 1 A g(-1). In addition, the NiSe2/MoSe2//AC device presented an impressive specific energy density of 53.7 Wh kg(-1) at a density of 749.9 W kg(-1). Furthermore, the two homemade pieces of the NiSe2/MoSe2//AC device in series (2 & times; 2 cm(2)) successfully powered multicolored LED lights or an electronic timer. The strategy of enhancing performance by regulating selenization time serves as a valuable guideline for designing advanced transition metal selenides.

To explore potential pathways for performance enhancement, this study investigates the effect of an external electric field on porphyrin-based dye-sensitized solar cells (DSSCs). Focusing on the porphyrin-based Dye 31, we systematically investigated the electronic structure characteristics of the dyes and Dye@TiO2 system, as well as the regulatory mechanism of the local electric field on some parameters. Comparative analysis revealed that Dye 31 exhibits superior overall performance over Dye 25 across multiple metrics, featuring a smaller energy gap (Eg), enhanced intramolecular charge transfer (ICT), and a longer excited-state lifetime (tau). The 31@TiO2 system exhibits significant charge separation, high electron injection, and better optoelectronic performance. Furthermore, the influence of local electric field strength on energy levels and gaps, spectra and charge transfer was discussed. This work provides insight into the photoelectric performance of chlorophyll derivative dyes and the mechanism of electric field influence.

Surface defects on perovskite films induce non-radiative charge recombination, which remains a primary factor limiting the open-circuit voltage (V OC) and overall performance of perovskite solar cells (PSCs). Herein, we introduce a passivation strategy employing two amine hydrochlorides, N-(2-aminoethyl)maleimide hydrochloride (AEMCl) and N-(2-aminoethyl)phthalimide hydrochloride (AEPCl), which yield distinctly different interfacial phase behaviors on the perovskite top surface. Intriguingly, AEPCl promotes the formation of n = 1 Ruddlesden-Popper (RP) phases at the interface, whereas AEMCl suppresses such low-dimensional phases and effectively passivates residual PbI2. Consequently, the AEMCl-treated device achieves a superior power conversion efficiency (PCE) of 26.14% with a V OC of 1.164 V, outperforming both the control (24.72%) and AEPCl-treated devices (25.46%). Furthermore, unencapsulated AEMCl-modified devices exhibited excellent durability, retaining 89.78% of their initial PCE after 4500 h of storage in N2 atmosphere. Under continuous one-sun illumination and maximum power point tracking (MPPT) in N2 at room temperature, the device maintained 85.01% of its initial efficiency after 1000 h. At the molecular level, this work demonstrates how molecular structure dictates the phase behavior of perovskites.

Bromodomain-containing protein 4 (BRD4) regulates transcription via its two homologous bromodomains, BRD4-BD2 and BRD4-BD1. The selective interaction mechanisms of three pyridinone inhibitors, Spd17, Spd21, and Spd33, with BRD4-BD2 and BRD4-BD1, were explored using multiple MD simulations, MM-GBSA, and SIE. The energy results indicate that these pyridinone inhibitors show greater selectivity for BRD4-BD1 compared to BRD4-BD2, while non-polar interactions, especially van der Waals interactions like CH-pi and pi-pi interactions are the key factors for interacting with BRD4-BD1 and BRD4-BD2. The energy differences of residues Val87/Val380, Leu92/Leu385, Asn140/Asn433, and Ile146/Val439 in BRD4-BD1 and BRD4-BD2 make contributions to their selectivity. The findings provide certain insights for the development of new BRD4 inhibitors.