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Excited-State Engineering of Chalcogen-Bridged Chiral Molecules for Efficient OLEDs with Diverse Luminescence Mechanisms.
Angew Chem Int Ed Engl
December 2024
South China University of Technology School of Materials Science and Engineering, State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices, 381 Wushan Road, 510640, Guangzhou, CHINA.
The exploration of circularly polarized luminescence is important for advancing display and lighting technologies. Herein, by utilizing isomeric molecular engineering, a novel series of chiral molecules are designed to exploit both thermally activated delayed fluorescence (TADF) and room-temperature phosphorescence (RTP) mechanisms for efficient luminescence. The cooperation of a small singlet-triplet energy gap, moderate spin-orbital coupling (SOC), and large oscillator strength enables efficient TADF emission, with photoluminescence quantum yields exceeding 90%.
View Article and Find Full Text PDFCASSAD: Chroma-Augmented Semi-Supervised Anomaly Detection for Conveyor Belt Idlers.
Sensors (Basel)
November 2024
School of Information and Physical Sciences, The University of Newcastle, Newcastle, NSW 2308, Australia.
Idlers are essential to conveyor systems, as well as supporting and guiding belts to ensure production efficiency. Proper idler maintenance prevents failures, reduces downtime, cuts costs, and improves reliability. Most studies on idler fault detection rely on supervised methods, which depend on large labelled datasets for training.
View Article and Find Full Text PDFApplication of FCEEMD-TSMFDE and adaptive CatBoost in fault diagnosis of complex variable condition bearings.
Sci Rep
December 2024
School of Big Data, Baoshan University, Baoshan, 678000, China.
The mode mixing problem and inherent mode function selection bias in Fast Ensemble Empirical Mode Decomposition (FEEMD) result in ineffective extraction of fault components during the denoising stage, the loss of coarse-grained information in Multiscale Fuzzy Dispersion Entropy (MFDE) reduces the stability of fault features, and the lack of adaptability of CatBoost hyperparameters leads to reduced diagnostic accuracy. Therefore, a complex variable operating condition fault diagnosis method based on Fast Complementary Ensemble Empirical Mode Decomposition (FCEEMD) - Time-shift Multiscale Fuzzy Dispersion Entropy (TSMFDE) and adaptive Optuna-CatBoost is proposed. We introduce paired white noise with opposite signs in the construction of FCEEMD, effectively suppressing mode aliasing by neutralizing the residual noise generated during decomposition.
View Article and Find Full Text PDFA shape-changing haptic navigation interface for vision impairment.
Sci Rep
December 2024
MakeSense Technology Ltd, London, UK.
Article Synopsis
- * A new shape-changing haptic interface (Shape) was tested, showing that individuals with VI were able to locate virtual targets much faster and more efficiently using Shape compared to traditional vibration feedback.
- * Shape received better user experience ratings than vibration feedback, and its performance matched that of natural vision, indicating potential for this technology in enhancing navigation for those with VI.
Real-Time CASSCF (Ehrenfest) Modeling of Electron Dynamics in Organic Semiconductors. Dynamics Reaction Paths Driven by Quantum Coherences. Application to a Radical Organic Semiconductor.
J Phys Chem A
December 2024
Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus 80 Wood Lane, W12 0BZ London, United Kingdom.
We present a strategy for the modeling of charge carrier dynamics in organic semiconductors using conventional quantum chemistry methods, including the analytic gradient for nuclear motion. The theoretical approach uses real-time CASSCF (Ehrenfest) all-electron dynamics coupled to classical nuclear dynamics for the special case of a small number (4-8) of molecular units. The objective is to obtain mechanistic/atomistic insight at the electronic structure level, relating to spin density dynamics, to the effect of crystal structure (e.
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