158 research outputs found
Recommended from our members
3D packaging for integrated circuit systems
A goal was set for high density, high performance microelectronics pursued through a dense 3D packing of integrated circuits. A {open_quotes}tool set{close_quotes} of assembly processes have been developed that enable 3D system designs: 3D thermal analysis, silicon electrical through vias, IC thinning, mounting wells in silicon, adhesives for silicon stacking, pretesting of IC chips before commitment to stacks, and bond pad bumping. Validation of these process developments occurred through both Sandia prototypes and subsequent commercial examples
Process development for automated solar cell and module production. Task 4: Automated array assembly
A process sequence which can be used in conjunction with automated equipment for the mass production of solar cell modules for terrestrial use was developed. The process sequence was then critically analyzed from a technical and economic standpoint to determine the technological readiness of certain process steps for implementation. The steps receiving analysis were: back contact metallization, automated cell array layup/interconnect, and module edge sealing. For automated layup/interconnect, both hard automation and programmable automation (using an industrial robot) were studied. The programmable automation system was then selected for actual hardware development
A three-axis accelerometer for measuring heart wall motion
This thesis presents the work carried out in the design, simulation, fabrication and
testing of miniaturised three-axis accelerometers. The work was carried out at the
Faculty of Science and Engineering at Vestfold University College (Tønsberg, Norway),
the MIcroSystems Engineering Centre (MISEC) at Heriot-Watt University
and in collaboration with the Interventional Centre at Rikshospitalet University
Hospital (Oslo, Norway). The accelerometers presented in this thesis were produced
to be stitched to the surface of human hearts. In doing so they are used to
measure the heart wall motion of patients that have just undergone heart bypass
surgery. Results from studies carried out are presented and prove the concept of
using such sensors for the detection of problems that can lead to the failure of heart
bypasses. These studies were made possible using commercially available MEMS
(MicroElectroMechanical Systems) three-axis accelerometers. However, the overall
size of these sensors does not meet the requirements deemed necessary by the medical
team (2(W) 2(H) 5(L) mm3) and fabrication activities were necessary to produce
custom-made sensors. Design verification and performance modelling were carried
out using Finite Element Analysis (FEA) and these results are presented alongside
relevant analytical calculations. For fabrication, accelerometer designs were submitted
to three foundry processes during the course of the work. The designs utilise the
piezoresistive effect for the acceleration sensing and fabrication was carried out by
bulk micromachining. Results of the characterisaton of the sensors are presente
Proceedings of the Low-Cost Solar Array Wafering Workshop
The technology and economics of silicon ingot wafering for low cost solar arrays were discussed. Fixed and free abrasive sawing wire, ID, and multiblade sawing, materials, mechanisms, characterization, and innovative concepts were considered
- …