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This study presents an integrated approach for the simulation of hygro-thermo-vapor-deformation analysis of electronic packages by using peridynamics. This theory is suitable for such analysis because of its mathematical structure. Its governing equation is an integro-differential equation and it is valid regardless of the existence of material and geometric discontinuities in the structure. It permits...
Statics is the foundation course upon which much of the Civil and Mechanical Engineering curriculum is based. A solid understanding in this course can help to propel students through their engineering studies. In this paper, we investigate the performance of students who took part in a “flipped” mastery based engineering Statics course. Compared to the tradition classroom, where students can pass...
In this work we present the design and fabrication of a test chip to be used for the characterization of the main electrical, mechanical and thermal properties of the structural materials involved in the development of polysilicon-based electrothermal actuators. With this combined bulk/surface micromachined chip, parameters such as Young's modulus (E), stretching or compression stresses (±σ), stress...
Simple, easy-to-use and physically meaningful analytical predictive models are developed for the evaluation of thermal stresses in bi- and tri-material bodies employed in various aerospace electronic and photonic packaging designs. The numerical examples are carried out for a bi-material assembly comprised of a silicon IC and a ceramic substrate, and for 2) a tri-material body obtained as a result...
The memristor, the recently discovered fundamental circuit element, is of great interest for neuromorphic computing, nonlinear electronics and computer memory. It is usually modelled either using Chua's equations, which lack material device properties, or using Strukov's phenomenological model (or models derived from it), which deviates from Chua's definitions due to the lack of a magnetic flux term...
Taking into account the increasing power issues arising due to scaling of feature size to nano scale regime, the design of a fixed-fixed beam geometry nano electromechanical (NEM) switch has been proposed here as a possible alternative for conventional complementary metal-oxide semiconductor (CMOS) based devices. Three dimensional (3D) finite element analysis (FEA) simulation tool CoventorWare2010...
Detailed theoretical analysis of how QD size variation and band-offset affects the confinement energy of InN QD is presented. Low dimensional structures show a strong quantum confinement effect, which results in shifting the ground state away from the band edge and discrete eigen-states. Graphically solving 1D Schrödinger ground quantized energy levels of electrons were computed and using Luttinger-Khon...
Photovoltaic (PV) modules based on silicon solar cells are widely used to convert solar energy into electrical energy. The energy output of these modules is very low due to their low power conversion efficiencies of approximately 15%. Reflectors are used to improve the power output of PV modules, by increasing the effective capture area. The performance of the solar panel with reflector depends mainly...
An abnormal narrowing of a blood vessel (stenosis) is investigated in this study. The present work provides a simulation of blood in a vessel with 50% stenosis. In addition, the effects of tissue surrounding the blood vessel on displacements and stresses in stenotic vessel wall are considered. The analysis consists of two distinct but coupled procedures: first, a fluid-dynamics analysis including...
Anchoring technology is necessary for the lander to land on the asteroid. Four types of anchoring modes and their characteristics are discussed, and then an anchoring system is introduced. Some key factors related to the performance of the anchoring system are presented. These factors include characteristics of the asteroid, penetrating energy and shape of the anchor tip. Penetrating energy and shape...
Real-time three dimensional simulations of the electrical tree initiation process in needle-plane geometry under DC field with practical parameters were conducted. The evolution of physical parameters in this dynamic process was presented. Three governing equations: the continuity equation, the transport equation and the Poisson equation, were used to describe charge injection and motion, and an iteration...
This paper discusses numerical properties of volume integral equation formulations in electromagnetic scattering by isotropic, anisotropic and bi-anisotropic objects. The volume integral equation formulation written in terms of the volume current densities and discretized with element-wise defined discontinuous functions is found to lead to more robust and efficient solutions on a wide range of material...
This paper provides an introduction to high-power electromagnetics. For the nuclear electromagnetic pulse, lightning, high-power microwave coupling, and some of the more energetic forms of electromagnetic compatibility problems, the fields are often high enough to produce nonlinear response in the scattering and coupling materials — often air. At lower fields, circuits and some magnetic materials...
Abstract An analytical model of circular contact spots was used in conjunction with numerical methods to estimate the impact electro-migration has on separable power contacts. A single spot model was developed using relative variables to estimate the rate of degradation. The single spot model was generalized to include variations in spot size and change in contact voltage and subsequently used to...
The dynamic non-linear material response of graphene is introduced into finite-difference time-domain simulations using a carrier rate equation. Experimental measurements of grapheme's relaxation time and saturation intensity are used to demonstrate sub-picosecond pulse formation via passive mode-locking in a 95 μm long Bragg cavity.
This paper describes the effect of transmission backlash on web tension in roll-to-roll manufacturing systems and provides a method to mitigate this effect. The term web is used to refer to flexible materials which are manufactured and processed in a continuous form by transporting the material on rollers through processing machinery; this type of manufacturing is referred to as Roll-to-Roll (R2R)...
In this work, the regional level set is employed to track interfaces in multiphase fluid simulations, while considering the behavior of the film between distinct phases. Also, properties of each phase are tracked as they merge or split, and an algorithm to apply these operations is proposed. Furthermore, it is introduced a method to handle undesired volume changes that tries to minimize the total...
Classification is a rather omnipresent problem in many of the technological areas ranging from image processing to medical applications. With complex-valued neural network classifiers posing better decision making capabilities due to its orthogonal decision boundaries and it's comparatively better computational capability many complex valued neural network (CVNN) classifiers has been presented in...
In this paper, we observe that an education that ends with a conventional transform-oriented course in signal processing leaves students inadequately prepared to engage with the research literature. A course built upon vector space methods, as we describe, provides an introduction to a broad range of applied mathematics topics that will prepare students to work on a variety of signals related problems...
This article deals with the modeling of a strain-displacement transducer conceived for extending the FBG measurement range. The intrinsic fragility of the optical fiber limits their application to cases characterized by relatively small deformations. To extend the employ to the large displacement field (i.e. morphing applications), a dedicated device was conceived, constituted by a circular ring connected...
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