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Sn-Ag-Cu (SAC) solder is one of the most promising candidates to replace Sn-Pb (SnPb) solder alloys. Reducing the amount of Ag phase is an important approach to obtain new SAC solders with lower cost. In this article, different proportions of Bi element were added into Sn-1.0Ag-0.5Cu (SAC105) lead-free solders. The melting points of these alloys are examined and the corresponding tensile properties...
In this study, a steady and comparatively smooth Ni-P coating on the surface of diamond/Al composite substrate was fabricated by electroless plating, which can outstandingly improve solderability of the composite. By controlling the deposition time, we obtained the growth curve of the Ni-P coating, and as a result we can adjust the thickness of the coating. The solderability was tested by soldering...
In the electronic industry, the packaging substrate is mainly made of copper, hence the interfacial reaction between solder and Cu during the soldering and the service process of solder joint always draw peoples' attention. In this study, a Sn3.8Ag0.7Cu1.5Sb3.0Bi0.15Ni (tentatively named as SACSBN) solder paste was evaluated on Cu substrate with comparison to Sn3.0Ag0.5Cu (SAC305). The effects of...
An electrocardiosignal acquisition and processing system based on standard 12-lead system is proposed, which is small, portable, real-time and able to barrage jamming. On the basis of completing the overall design of the system, every subsystem module of hardware was being detailed designed, including electrocardiosignal preprocessing module, AD convert module, electrocardiosignal control and store...
According to an analysis of the status quo of current local government debts in China and the modern history of bonds issued by Jiangxi Provincial Government, this paper argues that the present local bonds issuing system in our country is not only feasible, but also necessary and that a strict local bonds regulatory regime must be established. What's more, a scientific and rational issuance approach...
This paper addresses the problem of stabilizing an unstable time-invariant linear system by means of dynamic output feedback, where both the output measurements and the control signals are quantized, coded and transmitted over a noisy digital communication channel which connects the sensors, controllers and plants. It is found that there exists a quantization, coding and control strategy above a lower...
Hydropower project construction is becoming increasingly susceptible to various factors that give rise to time extension and cost overrun. Hydropower project construction contract claim is becoming both more numerous and more costly. Increasing attention is today being focused on the issue of claims and disputes resolution in the hydropower project construction. Although the hydropower project construction...
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