A5033112635- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Hydraulic and Pneumatic Systems
- Iterative Learning Control Systems
- Fault Detection and Control Systems
- Industrial Technology and Control Systems
- Tribology and Lubrication Engineering
- Advanced machining processes and optimization
- Luminescence and Fluorescent Materials
- Lanthanide and Transition Metal Complexes
- Risk and Safety Analysis
- Advanced Sensor and Energy Harvesting Materials
- Mechanical stress and fatigue analysis
- Adhesion, Friction, and Surface Interactions
- Crystal Structures and Properties
- Engineering Diagnostics and Reliability
- Control Systems in Engineering
- Organic and Molecular Conductors Research
- Statistical Distribution Estimation and Applications
- Perovskite Materials and Applications
- Reliability and Maintenance Optimization
- Robotic Mechanisms and Dynamics
- Civil and Geotechnical Engineering Research
- Railway Engineering and Dynamics
Beijing Chaoyang Emergency Medical Center
2024
Beijing University of Technology
2024
Huazhong University of Science and Technology
2024
Wuhan National Laboratory for Optoelectronics
2024
Beijing Jiaotong University
2003-2013
For complex equipment, it is easy to over-evaluate the impact of failure on production by estimating reliability level only through probability. To remedy this problem, paper proposes a statistical evaluation method based fuzzy data considering multi-state characteristics equipment failures. In method, new reliability-evaluation scheme firstly presented traditional analysis using Weibull distribution function. scheme, failure-grade index defined, and fuzzy-evaluation also proposed...
Stabilizing β-CsSnI 3 at room temperature by crystal-phase engineering provides a novel and fundamental perspective to enhance the near-infrared emission of black-phase CsSnI perovskites.
The blue electroluminescence from titania nanotubes doped into poly(2-methoxy-5-(2-ethyl hexyloxy)-p-phenylene vinylene) (MEH-PPV) was studied. results of absorption and photoluminescence demonstrated that the observed in nanocomposites comes directly band-to-band transitions nanotubes. relative intensity enhanced by increasing content Moreover, polymer light-emitting diodes with showed higher carrier transport ability lower onset voltages. Electroluminescence one-dimensional materials has...
In order to increase the red emission of Eu complex doped in poly(N-vinylcarbazole) (PVK), series molar ratio coprecipitates [TbxEu(1−x)(aspirin)3(phen)∙H2O] (phen=1,10-phenanthroline) were prepared, which Tb3+ ion acts as an energy bridge enhance transfer between ligands and europium ion. The intramolecular from Eu3+ was studied via a time-resolved spectrum. It gave direct evidence two lanthanide ions terbium europium. photoluminescence electroluminescence spectra well performance device...
Contact stiffness and backlash in the harmonic drive significantly impact a robot's positioning accuracy vibration characteristics. The height of tooth pair is typically less than 1 mm, making measurement modeling contact inherently complex. This paper proposes model by establishing correlation between fractal parameters load. To obtain roughness real machined surface, combination noncontact optical profiler RMS method employed. Subsequently, study explores influence rough surface force on...
Computer numerical control (CNC)-based systems are key functional components of industrial manufacturing installations, and the servo drive system is main component CNC systems. The complex working environment facilities will lead to frequent failure systems, effective fault diagnosis measures important ensure normal operation machine tools. In this paper, application methods in considered, a method suitable for high-dimensional data presented. Using collected by physical related indicators,...
The internal feedback hydrostatic bearing features a distinctive structural design, playing pivotal role in high-precision machine tools. Its performance significantly influences the improvement of machining accuracy and stiffness. In this study, working principle closed is described, equivalent liquid resistance model oil circuit considering flow effect established, an analysis method for evaluating support proposed, rate correction methods are influence load-carrying capacity due to inlet...
Abstract A ball screw is a critical drive component capable of converting force into motion, with widespread applications in the high-precision mechanisms various machine tools. The degradation precision attributed to wear significantly impacts tool accuracy. Current models lack consideration for ramifications radial forces and size errors.This study introduces pioneering approach by formulating coupled model that integrates wear, preload degradation. Through rigorous analysis, we discern...
Wheel-set hunting is an important and random lateral movement when wheel-set running on the track. Firstly a vehicle-bridge dynamic interaction model established, in which wheel-rail defined by Kalker linear creep theory with calculation of detailed contact adhesion geometric parameters force. Then case high speed train passing 32 m simply-supported beam bridge, calculated according to relative vehicle bridge movement. And characteristics different stiffness are discussed. simple close no...
In this letter, we demonstrate that hole injection and transport in polymer light-emitting diodes with phosphorescent dye Ir(ppy)3 can be significantly enhanced by doping p-type conductive dehydrated nanotubed titanic acid into poly(vinylcarbazole) (PVK) films at 2wt.%. At the same time, both energy transfer exciton recombination efficiency are improved because of open straight conformation PVK molecule nanocomposite. The performance these devices was greatly improved, showing higher...