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We measured the current-voltage and infrared optical transmission characteristics of thin film VO2 wires over the metal-insulator phase transition. The phase transition had electrical or thermal characteristics depending on the wire geometry and applied current.
Electrical and thermal conductivity of electrode materials in Electrical Discharge Machining (EDM) is the main factors that determine the suitability of these electrodes. These electrodes are usually made from graphite, copper and copper alloys because these materials have high electrical and thermal conductivity in additional to high melting temperature. The objective of this paper is to simulate...
The cable ampacity is closely related with its laying way and heat dissipation performance of the surrounding medium. With multi laying ways, the cable in ducts is the thermal bottleneck that constrains the whole cable line's ampacity. The cable conductor temperature could be reduced and the current-carrying capacity of the duct laying cable could be enhanced by filling medium with low thermal resistivity...
The surface properties of an object and the environment in which it is located are important for robot grasping and manipulation. Physical contact with an object using tactile sensors can enable the retrieval of detailed information about the object, i.e. compressibility, surface texture and thermal properties. This paper describes a system that classifies materials based on their thermal properties...
We review recent results concerning reliability and failure (due to heating) of interconnects based on metallic singlewalled carbon nanotubes (SWNTs), graphene, and graphene nanoribbons (GNRs). We examine both intrinsic power dissipation within the interconnect as well as extrinsically to adjacent materials. Fundamental reliability limits are different in the diffusive and quasi-ballistic transport...
Synthesis of Li4Ti5O12/soda lime silica composites has been carried out for anode component on lithium ceramic battery. The method for synthesis Li4Ti5O12 was SSR (solid state reaction) from Li2CO3 and TiO2 powders. All lithium based material was calcined at 700°C for 2 hours, then ball milling to achieve the particles finer and pass through to the filter of less than 400 mesh. Prior to sintering...
In this paper a new approach of ultra sensitive sensor based on coplanar waveguide is proposed. This sensor consists of two Wilkinson power dividers, makes use of the path difference of the two branches resulting in the opposite in phase, thus the weak signal changes emerge from the dramatically reduced background and the sensitivity is greatly improved.
The study of electrical insulating materials can never be overemphasized. When these materials are subjected to either electrical or thermal stresses each one respond in a uniquely different way from one another. The response of insulating materials to its stressors is a stochastic process with varying dependent variables. The discovery of newer or composite insulating materials, having better electrical...
This paper describes the aging performance of high-temperature vulcanized silicone rubber (HTV-SiR) resulting from a 2000h UV radiation exposure and a sand-blow test. In this study, HTV-SiR specimens were respectively exposed to an UV exposure chamber and a sand-blow chamber; furthermore, physicochemical analyses were conducted on the specimens before and after the treatment. The results showed that...
Calderon's method was generalized to deal with the image reconstruction of electrical resistance tomography (ERT) from partial boundary measurements. The electrodes of the ERT sensor are located on part of its boundary, which indicates that the Dirichlet-to-Neumann map is obtained on an open subset of the whole boundary. However, the Dirichlet-to-Neumann map is typically approximated from the data...
A model is developed to determine the peak current required to weld closed contacts. The model considers: (1) the total contact resistance of the closed contacts by including the expected constriction resistance as well as the resistance resulting from the high temperature of the contact spot; (2) the effect of the 'blow-off' force from the passage of the current through the contact spot; and (3)...
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...
This paper presents a textile patch antenna designed for WBAN applications at 2.45 GHz ISM band. The antenna uses denim as substrate and conductive fabric for the ground plane and radiator layers. The main purpose of this paper is to analyze the influence of typical deviation of denim properties and patch radiator dimensions on the performance of the antenna. The parameters considered in the analysis...
Three-dimensional numerical simulation model is constructed. Temperature field of the package with power chip (3W) is analyzed under unsteady-state condition during its working process. Five convection boundary conditions are applied to analyze their influence on heat dissipation; then, three cover materials and three thickness adhesives between the cover and the chip are used to study their influence...
In this study, Li2MnSiO4 as a candidate cathode material for lithium-ion battery was synthesized by sol-gel method and the precursors were fired in a N2 atmosphere at 900 ° C for 6 h. The electrochemical prosperities of the material cathode were measured by Electrochemical Integrated Test Instrument. The material is able to deliver a charge capacity of 302mAh g"1 and the first discharge capacity...
In this paper, the mould for producing high conductivity aluminum alloy used in electronic packaging has been designed. The three-dimension model is established and extrusion process is simulated by the software DEFORM-3DTM. The paper researches the distribution of the stress and strain under different extrusion velocities and temperature. The numerical simulation results show that the optimum temperature...
Low-dimensional thermoelectric materials are believed to have higher energy transformation efficiency compared to bulk materials. In this work, the thermal conductivities in normal direction of bismuth telluride thin films have been studied using Non-equilibrium Molecular Dynamics (NEMD) with a two-body potential. We predict the thermal conductivity in films with a thickness range of 6–40nm at 100,...
Air quality monitoring system that can monitor gas such as CO and SOx on ambient air in a real-time and can be accessed with internet line have been developed. Sensor element on this system is based on nano structured zinc oxide thin film synthesized using wet chemical route. Monitoring system is designed using arduino uno microcontroller as analog to digital converter, and ethernet shield for data...
The increasing requirements for heat dissipation in modern microelectronic devices makes it necessary to develop new materials (e.g. thermal interface materials) with high thermal conductivity. Due to excellent thermal and thermo-mechanical properties some nanomaterials, like carbon nanotubes, are increasingly being used to create new thermally conductive composites. The development of such composites...
AgI nanoparticle has been reported to exhibit size-dependent properties. In the paper, we reported the use of combinations of surfactants, such as AOT, SDS, PVP and TWEEN20, to control the AgI synthesis. AgI nanoparticles can be obtained with different sizes. Measured and confirmed by DLS and TEM, the nanoparticles can be massively and evenly prepared with the sizes less than 20nm. The post-processing...
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