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Reliability problems heavily hinder light-emitting diode (LED), especially high brightness LED, from developing rapidly and putting into mass production. One of the most important reasons is that it has so many interfaces which are always the weakest places. LED chip's working temperature is about 90°C and the high mismatch of coefficient of expansion of different materials can inevitably cause failures,...
Impact behaviors of high-power LED are essential due to the possible poor adhesion of interfaces and should be studied. In this study, the analysis of dynamic response for high-power LED module under impact load is conducted with simplified theoretical analysis, experimental testing and numerical simulation. A self-made microelectronics drop impact tester is established. Then reliability performances...
The effects of different shapes of silver; particles, flakes and dendrites on the electrical property of polydimethyl siloxane (PDMS)-based electrically conductive adhesives (ECA) under mechanical deformation are investigated. It is found that the high aspect ratio of silver dendrites helps to construct more conduction pathways in the ECAs compared with silver particles and flakes, therefore reducing...
The frequency limits in intrinsic fT of the nano-scale HEMTs with various channel materials are investigated by using the quantum-corrected Monte Carlo simulation. The device C with the InSb channel exhibits the higher intrinsic fT from the lower Vds because of the higher electron velocity. Owing to the shorter limit in the Lg scaling at the lower Vds, the device C also exhibits the higher frequency...
Friction and wear study of sliding surfaces plays a prominent role in the development of materials for various applications. The development of a low-cost multipurpose reciprocating tribometer at constant sliding speed to study the tribological properties of a material under dry, wet and high temperature conditions is presented in this paper. The tribometer has the ability of changing its stroke length...
Problem statement: The purposes of this study are twofold: First, to check the failures in Finite Element model of 2010 Toyota Yaris Sedan driver seat, when loaded as per Federal Motor Vehicle Safety Standards 207/210. And second, to enhance the strength of failure component of seat to pass the standards 207/210. Approach: Toyota Yaris Sedan Passenger Vehicle driver seat model is taken from the National...
With recent advancement in Radio Frequency Identification (RFID), RFID-based track-and-trace anti-counterfeiting has attracted considerable research interests. A track-and-trace anti-counterfeiting system requires an integral and reliable electronic pedigree (e-pedigree) to ensure high product visibility along the supply chain. With the continuous movements of large volumes of products along the supply...
We have developed an inexpensive inkjet printing process to fabricate percolation-based resistive strain gauges in a paper substrate. These strain sensors were fabricated by inkjet printing different suspensions containing conductive carbon black (CB). We have measured the resistance of these elements as a function of strain under low frequency cyclic loads to characterize the sensitivity of these...
The quasi-static capacitance-voltage (CV) characteristics of buried channel n-InGaSb MOSFET is investigated using SILVACO's ATLAS device simulation package. Self-consistent method is applied to solve the coupled one dimensional Schrödinger-Poisson equation taking into account of wave function penetration and strain effect. It is found that the CV profiles and threshold voltage are strongly depended...
We report the design, fabrication, and characterization of a high-resolution biaxial strain sensor based on guided-mode resonance (GMR) in a two-dimensional, asymmetric titanium dioxide nanograting embedded at the surface of a polydimethylsiloxane slab. The highly-compliant strain sensing technique used in this 2D GMR sensor relies on the shifting of the reflected resonant wavelengths, demonstrating...
Management of patient flow, especially the flow resulting from health crises (exceptional situations) in emergency departments (ED), is one of the most important problems ED managers have to deal with. Emergency departments require significant human and material resources to handle this influx of patients, but these are limited and so the medical and paramedical staff are often confronted with strain...
Ferroelectric (e.g., PZT), ferromagnetic (e.g., Terfenol-D) and ferroelastic (e.g., shape memory alloy (SMA)) materials offer unique design and control capabilities for a range of present and emerging control applications. However, all of these materials exhibit creep, rate-dependent hysteresis, and constitutive nonlinearities that must be incorporated in model-based control designs to achieve stringent...
Locomotion is the most important characteristic of living matter. To clarify the factor makes observers find out autonomy in locomotion of living organism is significant from the perspective of artificial intelligence or emergence. In considering physical basis of autonomy of locomotion, we have to remark following three biotic features; “unidirectional movement generated from asymmetric architecture”,...
The edge stresses, which are responsible for all physical properties of nanoribbons, always involve two sided non-equivalent edge effects for zigzag honeycomb nanoribbons of two dimensional binary compounds such as BN and MoS2. In present work, we develop an approach to determine the edge stresses of individual non-equivalent zigzag edges. For prototypical system of BN zigzag nanoribbon, the edge...
Dual-phase steel is characterized by an interesting combination of high strength, good ductility, continuous yielding, high initial work hardening rates, and a low yield stress to tensile strength ratio. The changes in the yield stress and appearance of prolonged lüder's strain in the stress strain curves of static strain aged dual phase steel motivate studying the parameters affecting the formation...
New technologies for the fabrication of Multi-Layer-Composites with sensor and actuator functionality were used. The compounds consist of Macro-Fiber-Composites (MFC) embedded in a layer of epoxy adhesive between two aluminum sheets. Forming takes place in an uncured state of the adhesive, so that a relative displacement between the layers is possible. This paper deals with the experimental and numerical...
We address the numerical analysis of piezo MEMS square extensional resonators and show that interfacial losses are dominant. These are formulated in terms of the stress jump across the interface yielding a viscous type of dissipation. The model developed is then employed to perform an optimization of the pattern of the piezo-layer so as to excite selected mechanical modes
The purpose of this study was to measure the rolling shear modulus of Cross Laminated Timber (CLT), which was achieved by conducting 3-point bending tests with variable span using downscaled sandwich specimens. Two types of sandwich specimens were employed: steel-wood-steel (SWS) and wood-wood-wood (WWW). Experimental results from SWS specimens were verified with those predicted from WWW ones through...
The study of students' preconceptions and how they affect their learning in science, technology, engineering and mathematics (STEM) fields is of nationally recognized importance. There are, however, various and contradictory theoretical approaches to conceptual change, and none of them have been rigorously applied in the context of engineering education. This paper is part of a larger study drawing...
In order to study how the Blank Holder Force (BHF), Die Radius and Drawbead (with or without) affect the stamping performance, this paper takes the automobile oil pan as the example, simulates the drawing procedure on Dynaform. And then analyzes the FLD (Forming Limit Diagram), Thickness or thinning figure and forming results. Finally, we get the optimal BHF and die radius.
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