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The plight of ethnic medical technology, education, and industry in ethnic minorities was examined, and the combined “industry-education-research” experience of Jiangxi University of Traditional Chinese Medicine was analyzed. Facing key scientific issues and technological demands, the development of an innovative collaborative model for ethnic medical technology, education, and industry was examined,...
The power system in package (SIP) includes multiple chips such as power IGBT, diodes and IC controllers. With more chips encapsulated in one single package, the silicon die crack failure is becoming more and more challenging. In this paper, a leadframe based power SIP package is investigated. The warpage induced reliability in assembly process is studied. The initial leadframe pad warpage will induce...
The power system in package (SIP) includes multiple chips such as power IGBT, diodes and IC controllers. With more chips encapsulated in one single package, the silicon die crack failure is becoming more and more challenging. In this paper, a leadframe based power SIP package is investigated. The warpage induced reliability in assembly process is studied. The initial leadframe pad warpage will induce...
This paper studies the microstructure effects on electromigration in lead-free solder joints in wafer level chip scale package (WL-CSP). It is an extension of an earlier isotropic model [1]. The three dimensional finite element model for solder joints is developed and analyzed in ANSYS®. A sub-modeling technique combined with an indirect coupled electrical-thermal-mechanical analysis is utilized to...
Interference mitigation scheme is studied for Device-to-Device (D2D) communication in cellular networks to improve the overall system capacity and spectrum efficiency. Firstly a lower bound of the neighbor distance is derived for a D2D UE according to the transmitter density and the QoS requirement of a D2D pair. By using this distance, a neighbor set can be chosen adaptively based on the interference...
Bismuth layer-structured Sr2Bi4−xHoxTi5O18 (x = 0.0, 0.1, 0.2, 0.3) ceramics were prepared by solid state reaction. X-ray diffraction pattern showed that pure bismuth-layered structure of SBTi was not affected by Ho-doping. SEM images showed that dense microstructures with uniform gain size were obtained in all samples. Dielectric, ferroelectric and piezoelectric properties of Sr2Bi4−xHoxTi5O18 ceramics...
Piezoceramics (K0.5Na0.5)0.94−3xLi0.06LaxNb0.95Ta0.05O3 (KNLNT-Lax) were synthesized by the conventional solid-state reaction process. The effects of (La,Ta)-doping on the phase structure and electrical properties of (KNLNT-Lax) ceramics were investigated. X-ray diffraction analysis showed that the crystal structure of the ceramics with high level of La-doping possessed pseudo-cubic phase and the...
The concentration of Cu, Ni, Cr, Zn, Pb and As in urban street dust collected from Kunming were analyzed by using X-Ray fluorescence spectrometry. Spatial technique was applied to study the content level and the spatial distribution character of heavy metal pollution in street dust of Kunming. The ecological risks of heavy metals in street dust were assessed by the potential ecological risk index...
In this paper, a novel power system module (PSM) is developed by integrating the vertical input capacitor inside the package. Comparing with the traditional PSM, the novel PSM has better electrical performance with less parasitic inductance and switching loss, due to a small loop from the input capacitor to the MOSFETs. A comprehensive modeling study is carried out to assess the assembly stress, thermal...
Power electronic packaging is one of the fastest changing areas of technology in the power electronic industry due to the rapid advances in power integrated circuit (IC) fabrication and the demands of a growing market in almost all areas of power electronic application such as portable electronics, consumer electronics, home electronics, computing electronics, automotive, railway and high/strong power...
The electrical performance (such as electrical resistance, inductance and fusing current capability) is a key factor for a power electronic product. Studying the impact of the defect on package electrical performance, especially for the parasitic effect is very important. It can help to understand the potential root causes and failure mechanisms, as well as to ensure the electrical performance meets...
In this study, corncobs biomass was utilized as an adsorbent to remove Pb(II) from aqueous solution. The adsorption behavior of Pb(II) was studied under different conditions, including solution pH, contact time and metal concentration. Ground corncobs were modified with CH 3 OH and NaOH to investigate the effect of chemical modification on Pb(II) binding capacity. Results showed that Pb(II)...
The problem of partner selection for virtual enterprise recombination is resolved by the parameterized service matching in this paper. A process model for this kind of service matching is established by means of adopting Petri net. Service and request in matching are formally described and a mathematical model is formulated for the matching. Based on this model, relevant service matching algorithm...
The unique characteristics of service mean that service has higher inherent risks than tangible product for the prospects. On the basis of previous reviews of the perceived-risk concept, a descriptive model of risk perception and reduction activity before service purchase is formulated, and consumers' risk-reduction activities are expatiated. Finally, the effective communication strategies for service...
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