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Phase change materials have been of increasing interest in thermal management of power batteries due to their high latent heat with minimum volume change. In this work, a numerical study of phase change materials is presented for the purpose of thermal control of the cylindrical power battery cells for applications in electric vehicles. Uniform heat density was applied at the battery cell surrounded...
Wearable devices are worn directly on man and one of the most important attribute for wearable devices is “user experience” friendly[1]. Wearable device is small in size, it is difficult to carry large capacity battery. the short duration of the battery and charging difficulties and other issues has become a universal response of all users, which seriously affect the user experience. Wireless energy...
Understanding the residual stress state in brazed joints is crucial for operational design and life time performance of the part in service. High magnitude residual stresses are expected in the joined materials following cooling from brazing temperatures (≈950C) due to large mismatches in material properties such as coefficient of thermal expansion and Young's modulus (E). This paper aims to further...
In this work, several design approaches are considered in the thermal analysis and enhancements of a 2.5-D package with multi chips on through silicon interposer (TSI), which include overmolding materials, metal slug, lid attachment, pin fin heat sink and fan-driven heat sink cooling. The analysis models consist of two dummy flip chips on a silicon interposer to represents the logic die and memory...
In this work, several design approaches are considered in the thermal analysis and enhancements of a 2.5-D package with multi chips on through silicon interposer (TSI), which include overmolding materials, metal slug, lid attachment, pin fin heat sink and fan-driven heat sink cooling. The analysis models consist of two dummy flip chips on a silicon interposer to represents the logic die and memory...
The losses of realistic litz wires are characterized while explicitly accounting for their construction, using a procedure that computes the current-driven and magnetic-field-driven copper losses using fast numerical simulations. We present a case study that examines loss variation in one- and two-level litz wires as a function of twisting pitch, over a wide range of values and in small increments...
In this work, a study of TSVs electrodeposition filling by the periodic pulse reverse current was performed in a plate solution without additives. A void-free filling was obtained at a lower current density while a hollow or seam structures were obtained at a higher current density. A “bottom-up” growth mode could be realized at the lower current density. The current distribution uniformity inside...
Graphene layers can be used as the conductive channel in metal oxide semiconductor field effect transistors, metallic electrodes in capacitors, etc. However, when graphene is grown by chemical vapor deposition (CVD), substrate-induced corrugations and strain-related wrinkles formed on the graphene layer impoverish the properties of these devices by lowering the conductance and increasing their variability...
We demonstrate flexible and highly sensitive capacitive sensor arrays that encapsulate DI water as dielectric. DI water, which is a ferroelectric liquid and has a relative dielectric constant of approximately 80, could increase the capacitance of the sensor and enhance the sensitivity while maintaining flexibility of the sensor with electrodes patterned on flexible PDMS substrates. The proposed sensor...
We have used a lift-off technique and X-ray photoelectron spectroscopy to probe initially buried interfaces of a CdTe solar cell after CdCl2 and contact treatments. We find that the cleavage takes place at or near the CdTe/CdS interface. On both surfaces, Cl is present, most likely due to diffusion through the CdTe layer during the high-temperature CdCl2 activation step. Te is present on both cleavage-exposed...
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