System level reliability assessment for high power light-emitting diode lamp based on a Bayesian network method

The increased system complexity in electronic products brings challenges in a system level reliability assessment and lifetime estimation. Traditionally, the graph model-based reliability block diagrams (RBD) and fault tree analysis (FTA) have been used to assess the reliability of products and systems. However, these methods are based on...

Correction to: Current evidence on the impact of medication optimization or pharmacological interventions on frailty or aspects of frailty: a systematic review of randomized controlled trials (European Journal of Clinical Pharmacology, (2021), 77, 1, (1-12), 10.1007/s00228-020-02951-8)

The article Current evidence on the impact of medication optimization or pharmacological interventions on frailty or aspects of frailty: a systematic review of randomized controlled trials, written by Farhad Pazan, Mirko Petrovic, Antonio Cherubini, Graziano Onder, Alfonso J. Cruz-Jentoft, Michael Denkinger, Tischa J. M. van der Cammen,...

New insights into guar gum as environmentally friendly polymer for enhanced oil recovery in high-salinity and high-temperature sandstone reservoirs

Chemical enhanced oil recovery (EOR) processes are usually used as additives for hydrocarbon production due to its simplicity and relatively reasonable additional production costs. Polymer flooding uses polymer solutions to increase oil recovery by decreasing the water/oil mobility ratio by increasing the viscosity of the displacing water....

Random voids generation and effect of thermal shock load on mechanical reliability of light-emitting diode flip chip solder joints

To make the light-emitting diode (LED) more compact and effective, the flip chip solder joint is recommended in LED chip-scale packaging (CSP) with critical functions in mechanical support, heat dissipation, and electrical conductivity. However, the generation of voids always challenges the mechanical strength, thermal stability, and...

Current evidence on the impact of medication optimization or pharmacological interventions on frailty or aspects of frailty: a systematic review of randomized controlled trials

Background: Frailty and adverse drug effects are linked in the fact that polypharmacy is correlated with the severity of frailty; however, a causal relation has not been proven in older people with clinically manifest frailty. Methods: A literature search was performed in Medline to detect prospective randomized controlled trials (RCTs)...

Machine Learning and Digital Twin Driven Diagnostics and Prognostics of Light-Emitting Diodes

Light-emitting diodes (LEDs) are among the key innovations that have revolutionized the lighting industry, due to their versatility in applications, higher reliability, longer lifetime, and higher efficiency compared with other light sources. The demand for increased lifetime and higher reliability has attracted a significant number of...

Stability of receding traveling waves for a fourth order degenerate parabolic free boundary problem

Consider the thin-film equation h _t +(hh _yyy ) _y =0 with a zero contact angle at the free boundary, that is, at the triple junction where liquid, gas, and solid meet. Previous results on stability and well-posedness of this equation have focused on perturbations of equilibrium-stationary or self-similar...

Lumen Degradation Lifetime Prediction for High-Power White LEDs Based on the Gamma Process Model

Nowadays, due to the advancement of design and manufacturing technology, there are many consumer products with high reliability. Similarly, the competition in the business sector influences the product development time to become shorter and that makes it difficult for manufacturers to evaluate the reliability of current products before new...

An effective approach for rotor electrical asymmetry detection in wind turbine DFIGs

Determining the magnitude of particular fault signature components (FSCs) generated by wind turbine (WT) faults from current signals has been used as an effective way to detect early abnormalities. However, the WT current signals are time varying due to the constantly varying generator speed. The WT frequently operates with the generator close...

The Density-Enthalpy Method Applied to Model Two–phase Darcy Flow

In this thesis, we use a more recent method to numerically solve two-phase fluid flow problems. The method is developed at TNO and it is presented by Arendsen et al. in [1] for spatially homogeneous systems. We will refer to this method as the densityenthalpy method (DEM) because the density-enthalpy phase diagrams play an important role in this...

Structural health monitoring of composite T-Joints based on distributed effects of localized damages

Application of the numerical density-enthalpy method to the multi-phase flow through a porous medium

In this paper we apply a new method to solve multi-phase fluid flow problem for 1D1D and 2D2D fluid systems. This method is developed at TNO and presented in [1] for spatially homogeneous systems. We call this method the numerical density-enthalpy method (or ??-hh method) because density-enthalpy phase diagrams (or ??-hh diagrams) play an...

Modeling of Ship Roll Dynamics and Its Coupling with Heave and Pitch

Noise-induced transition in ship roll oscillations