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In this paper, Ni-coated graphene nanosheets (GNS-Ni) were synthesized by an in situ chemical reduction method. Such GNS-Ni sheets, by varying their weight fractions (0.05, 0.1 and 0.2wt.%) were successfully incorporated into the SAC305 solder matrix to fabricate composite solders through the powder metallurgy processing method. The samples of composite solders were then investigated in terms of their...
A novel SiC doped SAC305 composite solder was developed by mechanically mixing various amount of the SiC whiskers with Sn-3.0Ag-0.5Cu solder paste. The effect of SiC whiskers addition on microstructure, microhardness and wettability of the composite solders was investigated. It was found that the eutectic structure was refined in the composite solder, and both of the microhardness and wettability...
NiCu is one of the widely used thin-film materials, which is now commonly used as sensor and resistor in very-large-scale-integration (VLSI) because of its high resistivity and stability. However, with the scale decreasing and the temperature increasing in service condition, the limited reliability of NiCu thin-film material has been a key issue in microelectronics and packaging industry mainly due...
A novel SiC doped SAC305 composite solder was developed by mechanically mixing various amount of the SiC whiskers with Sn-3.0Ag-0.5Cu solder paste. The effect of SiC whiskers addition on microstructure, microhardness and wettability of the composite solders was investigated. It was found that the eutectic structure was refined in the composite solder, and both of the microhardness and wettability...
In this paper, Ni-coated graphene nanosheets (GNS-Ni) were synthesized by an in situ chemical reduction method. Such GNS-Ni sheets, by varying their weight fractions (0.05, 0.1 and 0.2wt.%) were successfully incorporated into the SAC305 solder matrix to fabricate composite solders through the powder metallurgy processing method. The samples of composite solders were then investigated in terms of their...
NiCu is one of the widely used thin-film materials, which is now commonly used as sensor and resistor in very-large-scale-integration (VLSI) because of its high resistivity and stability. However, with the scale decreasing and the temperature increasing in service condition, the limited reliability of NiCu thin-film material has been a key issue in microelectronics and packaging industry mainly due...
The electromechanical coupling phenomenon in CNC machine tool has an important influence on the dynamic precision of the feed system. The complicated dynamic characteristics and their evolutions with different parameters will aggravate the research difficulty of the electromechanical coupling mechanism. In this paper, taking SL250 lathe as the research object, the servo torque and mechanical structure...
To investigate an efficient and cost effective method to catalyze transesterification reaction, the lipase immobilized on chitosan beads was introduced in the present paper with a hypothesis that the immobilized lipase could catalyze transesterification to get a high triglyceride conversion. Four immobilization methods namely cross-linking using glutaraldehyde (GLA), activation with 1-Ethyl-3 (3-dimethyl-aminopropyl)...
This paper starts with the ecological corridor analysis, and then demonstrates that the traditional methods didn't discuss about this in land consolidation. Through adopting the related landscape pattern model and other methods in analyzing the pattern of land consolidation area, the study used the length, width, area of ecological corridor for representing spatial structure feature and connectivity...
The antioxidant activity of triterpenes from Caculis of Schisandra Chinensis(Turcz.) baill by means of ethanol extraction were evaluated by various methods in vitro systems, including total reducing power, superoxide anion radical, hydroxyl radical, DPPH radical-scavenging assays and the POV value. The experimental results show: Triterpenes have better reducing power, stronger antioxidation effect...
As a clay mineral material, the vermiculite does well in the auto-absorption to the pollutants in the flowing water on the pavement. The paper according to the passage collecting pool purifying filtration system of the project of Hengda Section belonging to Daguang Freeway in Hebei Province, giving a briefly introduction of the apply of the vermiculite in this system.
In present paper, the effect of miniaturization on the microstructure and mechanical property of solder joints is investigated. With the miniaturization of solder joints, the thickness of IMC decreases, while, the IMC proportion to the solder joint increases; meanwhile, the concentrations of base materials in the bulk also increase with the reducing stand-off height (SOH). Due to the interaction of...
The relationship among the electrical resistance, the thickness of the IMC layer and the aging timer of the micro SOH solder joints is investigated in present paper. It's found that the composition of compositions of the intermetallic compounds are Cu3Sn near the Cu side and Cu6Sn5 near the solder side; With the increasing of aging time, the thickness of the Cu3Sn increased while the thickness of...
In this paper, the effect of the stand-off height (SOH) on the microstructure and tensile strength of Cu/Sn-8Zn-3Bi/Cu and Cu/Sn-9Zn/Cu solder joints with SOH of 100 mum, 50 mum, 20 mum and 10 mum were studied. The results show that as the SOH is reduced, the needle-like Zn-rich phase steadily decrease until completely disappeared in both of the two solder joints. For Cu/Sn-9Zn/Cu, Cu5Zn8 IMC is formed,...
This paper analyzes the characteristics of the traditional DEILPHI method, pointing out that the method has the shortcomings of strong subjectivity, complex data acquisition, and lack of real-time circumstance-specific solutions. It proposes an improved DEILPHI method based on objective preferences. According to the characteristics of evaluation indicators and the specific situation of actual evaluation...
Complex adaptive system (CAS) approach is effective for modeling supply chain system with structural and behavioral dynamics. This paper proposes a complex adaptive supply chain framework based on information message transfer in terms of the forming mechanism of supply chain. The dynamical growth of the whole network is simulated: isolated nodes randomly distributed in the environment build connections...
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