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China's equipment manufacturing industry has developed rapidly, but the environmental pollution which is brought about by equipment manufacturing industry is very serious. The equipment manufacturing industry is one of the mainstays for implementation of circular economy. This paper mainly studies the development modes of equipment manufacturing industry under concept of circular economy. There are...
Since its introduction in the early 1990s, plastic ball grid array (PBGA) package had become the ldquopackage of choicerdquo due to its good electrical performance, lower cost, high assembly yield and self-alignment during board assembly process. Thermo-mechanical behavior of PBGA is highly dependent on the properties of the constituent components. The relative mechanical compliances and thermal expansion...
Objective Xanthine oxidase inhibitory activities of the total biflavonoids and eight biflavonoid compounds isolated from the medicinal plants of Selaginella labordei have been investigated. Method The active compounds were screened out by measuring the inhibition rate and the 50% inhibitory concentration (IC50) of each sample against xanthine oxidase (XOD) in vitro. Result Three kinds of biflavonoids...
The electromigration of flip chip solder joints is an ongoing reliability concern for manufacturers of integrated circuit (IC) components and electronic systems. As power levels of ICs continue to increase, current densities within individual solder bumps often increase, along with the operation temperatures of the die surface. Both of these factors have detrimental impact on the electromigration...
Integrated Heat Spreader (IHS) lids are increasingly being used in flip-chip package technology to enhance power and thermal capabilities. Adequate adhesion of the thermal interface material (TIM) and lid sealant materials are required to not only provide a continuous thermal interface, but also to permit manufacturability. This paper outlines criteria to aid in the material selection process for...
The thermodynamics analyse of systems of Ca-P2O5-H2O and Ca(OH)2-H3PO4-H2O in the water solution when synthesize hydroxyapatite using Sol-gel method was made. The relation figure of distributing coefficient of phosphorous acid and all the phosphorous acid radical hydroniums in the water solution and PH value and the relation figure of lg[Ca]T and PH value were drawn, and the appropriate condition...
Distribution center is a bridge connecting providers and clients. It plays an important role in logistics system. This paper put forward the least cost and the shortest time allocation models of materials distribution center. The integrated measure allocation models of materials distribution center considering the time and the cost together is built and a solution flow to the least cost and the shortest...
In this paper, the design of material structure and device structure , fabrication processing and characterization on GaAs based Resonant Tunneling Transistor (RTT) with groove and self-aligned gate structure have been described completely and systematically .The experimental results measured from our fabricated RTT show that : the maximum value of Peak to Valley Current Ratio (PVCR) is 46, the transconductance...
The study of polymers used in electrical insulation of wiring is important to the aerospace industry due to potential loss of life and aircraft in the event of an electrical fire caused by breakdown of wiring insulation. In this work, the effect of thermal exposure on the permittivity of PTFE is studied in order to examine the feasibility of developing of a capacitive nondestructive testing method...
Millimetre-wave imaging radars show great promise in a number of application areas. This paper briefly covers some of these application areas and describes two active coherent imaging systems that have been used by the authors to explore them. The architectures of these systems are explained along with a sample of measurements taken with the systems. The feasibility of these systems in the application...
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