With the rapiddevelopment of microelectronics industry, 3d integrated circuit (3d-IC) packaging technology is gradually applied in power electronic devices due to its high frequency, high integration and high intelli...
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ISBN:
(数字)9781665499057
ISBN:
(纸本)9781665499057
With the rapiddevelopment of microelectronics industry, 3d integrated circuit (3d-IC) packaging technology is gradually applied in power electronic devices due to its high frequency, high integration and high intelligence. Transient Liquid Phase (TLP) connection technology based on Cu/Sn/Cu system has the most practical background and research value. To improve the mechanical reliability of Sn solder joint, Nd particles were doped into solder. In this study, Sn interconnect solder doping Nd particles were fabricated by TLP technology, and then the impact of Nd particles on the interfacial reaction and shear behavior of the composite solder joints was investigated. By means of Nd element was added into solder to refine its microstructure, so as to improve the joint mechanical properties.
We investigate patterns of adoption of 175 social media services andweb businesses using data from Google Trends. For each service, we collect aggregated search frequencies from 45 countries as well as global average...
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ISBN:
(纸本)9781450327459
We investigate patterns of adoption of 175 social media services andweb businesses using data from Google Trends. For each service, we collect aggregated search frequencies from 45 countries as well as global averages. This results in more than 8.000 time series which we analyze using economic diffusion models. The models are found to provide accurate and statistically significant fits to the data and show that collective attention to social media grows and subsides in a highly regular manner. Regularities persist across regions, cultures, and topics and thus hint at general mechanisms that govern the adoption of web-based services.
In this paper, a 3d plastic packaging technology based on 2d-MCM stacking was proposed. Through PGA and embedded nut structure, the reliability of electrical interconnection between the module and PCB in high overload...
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ISBN:
(数字)9781665499057
ISBN:
(纸本)9781665499057
In this paper, a 3d plastic packaging technology based on 2d-MCM stacking was proposed. Through PGA and embedded nut structure, the reliability of electrical interconnection between the module and PCB in high overload environment could be improved. The finite element simulation result of the maximum stress of the 3d plastic packaging module under 20000g impact was 132.62 MPa, which was mainly distributed in embedded nuts area, while the stress of the PGA position was lower than 20 MPa. An anti-impact inertial navigation microsystem module was developed, which integrated a computing unit, an IMU (3-axis accelerometer and3-axis gyroscope) and a power management unit. The size of the microsystem module was 30mm x 30mm x 8.4 mm. After the temperature cycle of-55 degrees C similar to 125C and the impact test of 5000g, there were no delamination and cracking in the microsystem module. The firing test was carried out, and the measured result of X-axis acceleration was from -32g to -2g during 30s, and the angular velocity of the wy-axis were -30 degrees/s to 30 degrees/s.
Realization of components in gap-waveguide technology can he expensive and time-consuming due to demanding manufacturing procedure. To reduce the costs of production we hale investigated the characteristics of a 3d pr...
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ISBN:
(纸本)9781728155142
Realization of components in gap-waveguide technology can he expensive and time-consuming due to demanding manufacturing procedure. To reduce the costs of production we hale investigated the characteristics of a 3d printed leaky wave antenna metallized using loss-cost electroless process. As a proof of concept, leaky wave antenna is designed in grouse gap-ssaseguide technology for operation at 30 GHz. The antenna was simulated, manufactured and measured to verify the design and the quality of the used copper plating process.
In this paper, we aim at finding out which users are likely to publicly demonstrate frustration towards their jobs on the microblogging platform Twitter - we will call these users haters39;. We show that the profile...
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ISBN:
(纸本)9781450327459
In this paper, we aim at finding out which users are likely to publicly demonstrate frustration towards their jobs on the microblogging platform Twitter - we will call these users haters'. We show that the profiles of haters have specific characteristics in terms of vocabulary and connections. The implications of these findings may be used for the development of an early alert system that can help users to think twice before they post potentially self-harming content.
High density 3d heterogeneous integration technology used in electronic equipment microwave modules was studied in the paper,high aspect ratio through silicon via (TSV) function interposer preparation, high precision ...
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ISBN:
(数字)9781665499057
ISBN:
(纸本)9781665499057
High density 3d heterogeneous integration technology used in electronic equipment microwave modules was studied in the paper,high aspect ratio through silicon via (TSV) function interposer preparation, high precision wafer level flip chip, high reliable fan-out package, Si interposer hermetic bonding were researched in detail. High density 3d heterogeneous integration samples were manufactured. The results indicate that through silicon via (TSV) function interposer was made by deep via etching, copper plating hole filing and surface re-distribution layer (rdL), high reliable chip to wafer (C2W) flip chip was made by bump preparation and flip chip technology, fan-out packaging was made by high precision die thinning, bump preparing and high reliable plastic packaging technology, high precision interposer hermetic bonding was made by high precision pre-alignment of wafer lever bonding, and wafer level hermetic bonding technology. The paper supplies technology reference to high density 3d heterogeneous integration used in electronic equipment microwave module.
While mobile 3d maps are not a new idea, implementations have been sparse. One reason is the serious lack of computing resources in the mobile environment, while another has been the lack of feasible programming inter...
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ISBN:
(纸本)0889864640
While mobile 3d maps are not a new idea, implementations have been sparse. One reason is the serious lack of computing resources in the mobile environment, while another has been the lack of feasible programming interfaces. As the mobile 3d programming interfaces OpenGL ES1 and JSR-1842 have lately emerged, the remaining main obstacles are the limited resources. In this paper, we discuss the technical challenges in creating a mobile real-time 3d city map application with support for dynamic content, and present a set of feasible solutions.
Flexible electronics devices have many advantages, such as portability, transparency, good stretching and bending ability. In recent years, with the growing demand of the flexible electronics, it promoting the innovat...
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ISBN:
(数字)9781665499057
ISBN:
(纸本)9781665499057
Flexible electronics devices have many advantages, such as portability, transparency, good stretching and bending ability. In recent years, with the growing demand of the flexible electronics, it promoting the innovation of manufacturing method. direct ink writing (dIW) is a low-cost, flexible and efficiency method to patterning conductive circuits on the flexible substrate. In this paper, direct ink writing of commercial silver paste on PI substrates is introduced and the parameters that can be modified to tune the process include feed pressure, dispensing gap, moving speed and nozzle size are discussed. The results show that the commercial silver paste based on dIW method can obtain minimal trace width of 151 mu m on PI substrates under 0.11mm inner diameter nozzle, 100mm/min moving speed, 0.15Mpa feed pressure and 0.07mm dispensing gap. Then using the five-axis micro pen direct writing device developed by Ruite 3d, the silver paste pattern was successfully printed on the curved surface, which provided a useful reference for the subsequent application of the silver paste dIW technology in conformal antennas, flexible wearable devices and other 3d circuit fabrication directions.
Compressed sensing(CS) is a significant technology in MRI reconstruction, which can reconstruct the image with few undersampleddata and speed up the imaging. The conventional CS-based MRI is implemented on the global...
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ISBN:
(纸本)9781538668122;9781538668115
Compressed sensing(CS) is a significant technology in MRI reconstruction, which can reconstruct the image with few undersampleddata and speed up the imaging. The conventional CS-based MRI is implemented on the global image, which not only loss many local structures but also fails in preserving the detail information. To improve the reconstruction quality, we proposed a novel CS-based reconstruction model, which is incorporated with nonlocal technology to gain extra details preservation. The proposed model grouped the similar patches within the nonlocal area, and stacked them to form a 3d array. Then, to process the array in a realistic 3d way, a tensor-based sparsity constraint is developed as the regularization on the reconstructed image. Experimental results show that the proposed method is more effectiveness and efficiency than the conventional ones.
This paper presents a 3d video scanner design for human face performance capture by active illumination stereo vision, combining a computational stereo algorithm with pattern projection to add texture to the scene. Th...
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