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Electrical conductivity of electrically conductive adhesives is controlled with three mechanisms. These mechanisms are described — a phonon-electron interaction, a constriction mechanism and a tunnel mechanism. If the phonon-electron and constriction mechanisms dominate; the temperature dependence of resistivity is positive and linear, and the temperature coefficient of resistivity is positive. If...
We experimentally investigated the device performance of n+- poly-Si/PVD-TiN stacked gate FinFETs with different Hfin's. It was found that mobility enhances in the tall Hfin devices due to the increased tensile stress. However, as Lg decreases, Ion for tall Hfin case becomes worse probably due to high Rsp. It was also confirmed that Vth variation increases with increasing Hfin due to the rough etcing...
Constant voltage electromigration was investigated as a method for assessing reliability in narrow Cu conductors. It is demonstrated theoretically that constant voltage (CV) testing can offer advantages over constant current (CC) testing for material that may vary significantly in geometry (thickness or line width) from sample to sample. Using known misprocessed material, this anticipated result was...
Charge transport in amorphous-chalcogenide materials used for manufacturing memory devices is determined by two mechanisms: hopping of trapped electrons and motion of band electrons. Electron-electron interaction is investigated here as one of the mechanisms mainly responsible for the trap-to-band transitions. The problem is tackled using a fully quantum-mechanical approach by numerically solving...
Contact resistance is important to integrated circuits and thin film devices, carbon nanotube based cathodes and interconnects, field emitters, wire-array z-pinches, metal-insulator-vacuum junctions, and high power microwave sources, etc. In other applications, the electrical contacts are formed by thin film structures of a few microns thickness, such as in micro-electromechanical system (MEMS) relays...
Fe-Cr matrix composites reinforced with Al2O3 particulates fabricated by powder metallurgy (PM) method offer potential for cheaper wear resistance materials and high temperature application. The influence of Al2O3 amount on densification, micro-hardness, wear resistance and strength of the composites were evaluated. The results showed that Al2O3 yield good influence on Fe-Cr matrix composites. Increases...
This paper developed a module system which can automatically determine the stamping direction of the sheet metal part in UG system based on the three-dimensional digital model of the product. According to the knowledge and expertise of mould design the principle of the stamping direction is determined and thus the fundamental mathematical model is established. Using advanced optimization algorithms...
This paper illustrates an application of the FMEA method to study and analyze the defect causes in order to reduce the defects from failure of the magnetic reader head used in the 3.5-inch desktop hard disk drive assembly process. The failure ratio of 11.27% was observed at the hard disk drive assembly operation. The solution approach started from identifying sub-processes, where the PCBA Assembly...
Thermal interface resistance of solids is an important factor for heat conduction from one solid to another. Interface resistance disrupts heat flow in systems like CPUs and various solid state devices like LEDs. Interface materials play an important role in heat transport through interface. In this study, Al203 with different thickness was coated on a copper substrate. The overall thermal conductivity...
Thermal interface resistance of solids is an important factor for heat conduction from one solid to another. Interface resistance disrupts heat flow in systems like CPUs and various solid state devices like LEDs. Interface materials play an important role in heat transport through an interface. In this study, TiN/Ti with different Ti thickness and Ti/TiN was coated on a copper substrate. In general...
The electromagnetic field radiated by a multiwall carbon nanotube is predicted in the frequency domain using the equivalent single conductor (ESC) formulation, and it is compared with the field radiated by a single wall carbon nanotube bundle having circular cross section and the same external diameter. The effect of the frequency and of the configuration on the near field level is investigated, in...
The Cr3C2/Fe/Al composite coating on 20g steel substrate was prepared by arc spraying method. The microstructure and hot-corrosion resistance at 650°C were investigated by means of XRD, SEM and etc. The results show that the coating exhibits the typical lamellar structure with great combinability. The porosity of coating is 8.6% With the increasing of temperature, the hot-corrosion rate of coating...
Bilingual education comes to be a significant strategy developing interdisciplinary talents and international human recourses in Chinese colleges and universities. The research takes the case study of bilingual education for Economics teaching strategy in the context of Chinese-foreign cooperation programme. A perspective of cross culture adjustment is studied for both the reaction of students and...
This paper discusses the influences of various underfills and adhesives on board-level bend performance of ChipArray® Thin Core Ball Grid Array (CTBGA) assemblies through an the monotonic three-point bending test. It is found that the bonding materials do enhance the bend performance for all the test categories as compared with the control assemblies which are without bonding materials, but the degrees...
Through analysis on the interaction and relationship between materials and airflow in the vertical pipe of an impeller blower, movement equations of materials flowing through the vertical pipe was established and the movement of materials was numerically simulated with the adoption of computer analysis software MATLAB. The reliability of the equations and numerical simulation was verified through...
Based on the friction partition theory (Einstein 1942) and affections of breadth depth ratio on roughness(Knight 2002), the relationship between bed and wall roughness coefficient is researched though 28m flume experiment. The measured water level agree with the calculated one which supposed n = nb = nw. And it proves that bed roughness coefficient equal to wall roughness coefficient while the rectangle...
In order to look into the post-fire bearing capacity of the steel tabular columns protected with different materials, the fire test was conducted for a set of circular steel tubes protected with different materials such as gypsum fireproof panel, bamboo plywood and the ordinary lumber core plywood, and the steel tube without any protective material. The axial compressive bearing capacity of the specimens...
SiCp/Cu composites were fabricated by the dual-directional extrusion process of the floating die. The microstructure, wear behavior and conductivity of SiCp/Cu composites were studied by optical microscope, abrasion test and current conductivity instrument. The results show that the SiCp/Cu composites with SiC particle distributed uniformly can be obtained, and the conductivity of composites decreased...
The degradation of insulation materials of the multi-contacts electrical connector often resulted in malfunction of the electronic system in harsh environment, due to which, we put up a model for the electrical connector with degraded insulation and the simulation for the model was also investigated. It was found that a current leakage channel was formed because of the degradation of the insulation...
Taking a super high-rise building as the engineering background, a wind resistant design method of high-rise buildings installed with viscoelastic dampers (VED) is presented in this paper. The mechanical model of VED system and the structure is established through the following steps. Firstly, the typical impulsive wind load is obtained by the impulsive wind simulation program developed by the author...
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