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This paper deals with the development of a new test stand for determination the thermal conductivity of metals, semiconductors, highly conductive die attaches and substrates using the steady state technique. We designed the test stand and optimized it by FE simulation to have flexibility for the selection of the sample size and measurement parameters. We determine the thermal conductivity from the...
This paper presents SPICE modeling of Phase-change Random Access Memory (PCRAM). Different models of PCRAM have been already proposed but those models still lack capability to exactly model the behavior of PCRAM. In this paper we have introduced various physical parameters in the programming, to accurately model PCRAM behavior. The modeling of PCRAM cell has been done in Verilog-A and simulation results...
To meet the requirements for future fine pitch and high-performance interconnects in advanced packaging, ICAs with nano-materials are attracting more and more interest due to their specific electrical, mechanical and optical properties. There has been extensive research on nano-conductive adhesives containing nanofillers such as nanoparticles, nanowires or carbon nanotubes. In this paper, copper nanoparticles...
According to Moore's Laws, complexity and power densities of electronic devices are increased during the last decades, moreover their dimensions are shrinking to nanometers causing hot-spot temperature escalation. Thermal management, therefore, becomes a critical issue for next generation of electronics. This scenario motivates development of novel thermal conductive adhesive (TCA) with enhanced thermal...
First principles-based calculations of the electronic and phonon properties of monolayer MoS2 are performed to assess the thermoelectric performance of this 2D material. By comparing monolayer MoS2 to bulk Bi2Te3, a good and well-characterized thermoelectric, it is found that the intrinsic properties of MoS2 are similar to Bi2Te3 in terms of thermoelectric figure-of-merit. While the advantage of Bi...
Thermal issues increase with the electronic industry pushing towards fast in high speed, high density, and high performance. Thermal conductive materials are strongly demanded for increasing heat dissipation and reducing operating temperature of devices. Hexagonal boron nitride (h-BN) nanosheet that owns high thermal conductivity and low coefficient of thermal expansion is a good filler candidate...
Thermal interface materials (TIMs) which consist of metal foil and soft cushion are used in the process of chip processor platform validation (PPV) process, and some defects, such as the stains caused by debris peeled off from TIMs due to stress concentration, were found on the surface of the chips and they had an hazardous influence in the testing process. As well as that, the thermal resistance...
This paper describes a study of automatic composition design software for human body-equivalent phantoms. Based on adaptive multiple regression analysis, this software enables engineers to efficiently design a target phantom for experiments. The materials water, silicone emulsion, glycerin, sodium chloride, and agar can be used to compose human body-equivalent phantoms. This paper will also present...
Measurements of physical transport properties of thermoelectric materials are plagued by large uncertainties (of tens of percent). Development of new materials towards larger efficiency in converting heat into electrical energy would benefit from improved measurement reliability. We are proposing to extend the 3ω method for the simultaneous measurement of the Seebeck coefficient, electrical conductivity...
Using absorption materials to reduce RF heating during MRI procedure is studied in this paper. Materials with different electromagnetic absorption characteristics are used to alter the EM and current distributions on the device. Consequently, the RF induced heating behaviors of external fixation devices can be reduced. Numerical and experimental studies are provided to demonstrate the potentials of...
Thin and flexible freestanding graphene nanoplatelets (GNPs)-based paper-like materials are fabricated and experimentally characterized to assess their employment as radiofrequency electromagnetic interference shields. Samples are obtained by vacuum filtration of ultrasonicated suspensions. Different suspensions are prepared by mixing either acetone/DMF or acetone/NMP and worm-like exfoliated graphite...
A multi-physics model is developed based on P2D model, including the electrochemical part, thermal part and the temperature distribution. It can simulate the physical and chemical phenomena from the scale of the active particles to the scale of whole battery. The charging optimization is also investigated, two internal characteristics, which can only be calculated by the proposed model, are treated...
This work investigates the fundamental properties of armchair single-wall carbon nanotubes (armchair-SWCNTs) dipole antenna at THz band using Drude method. Due to their metallic conducting properties, the armchair SWCNTs will be utilized in this work. The radiation pattern, s11 parameters, phase velocity and antenna directivity are presented for this antenna. The results demonstrate that armchair-SWCNTs...
Metasurfaces have paved the way for compact and flat electromagnetic systems with properties not readily available in nature. Graphene, naturally occurring two-dimensional material, may serve as a candidate for fully functional flatland photonics. Here we exploit the unique electronic properties of graphene and suggest a paradigm for a single-layer nonreciprocal graphene-based metasurface with extreme...
In the last decade, we have experienced a fascinating transformation in the research and development of atomically thin-layered material (ATLM) systems. Graphene and its compounds have enabled the development of novel devices for a wide variety of applications in an extremely short period of time. In addition, non-graphene ATLMs have recently been utilized to produce devices with exceptional performances...
Estimating the contact resistance and losses of Carbon-Nanotubes based devices is a challenging task. This work presents an effective model to calculate the contact resistance of single-walled carbon nanotube-based RF devices. The model realistically incorporates operational parameters beyond the quantum limits and it makes it feasible to implement the model in commercially-adopted COMSOL simulators...
Characterizing and tracking electrical conductivity, magnetic permeability and thermal conductivity in conductive material have promising potential for the detection and evaluation of material state undertaken by fatigue or residual stress. This letter proposes a spatial-transient-stage tensor mathematical model of eddy current pulsed thermography system and Tucker decomposition algorithm for characterizing...
Microvaristors are used particularly as lightning arrestors. In another case, they are used as the electrical field grading materials. Additionally, we especially focused on their low volume resistance at the composite material of the microvaristors to use it as the anti-electrostatic coating. In the previous study, we found a solution to disperse microvaristors uniformly. In that study, we used semi-conductive...
Polyethylene (PE) and oil impregnated paper are widely used as insulation materials in high voltage power equipment however, at high voltages the space charge inside the insulating material can distort the electric field distribution and thus greatly influence aging and degradation. Moreover, there is usually a temperature gradient across the insulation when the equipment is in service, and this can...
Most carbon nanomaterials are touted for their unusual conductive or semiconductive properties. In this paper, we compare the many-layered graphene oxide (GO) and GO-silver nanocomposite “papers” to elucidate their unusual resistive properties. We have observed significant nonlinearities in resistivity, its dependence on temperature, and current-induced effects on the resistivity of these materials.
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