The Experts below are selected from a list of 123 Experts worldwide ranked by ideXlab platform
Wen-hwa Chen - One of the best experts on this subject based on the ideXlab platform.
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Die Shift Assessment of Reconstituted Wafer for Fan-Out Wafer-Level Packaging
IEEE Transactions on Device and Materials Reliability, 2020Co-Authors: Hsien-chie Cheng, Chia-heng Chung, Wen-hwa ChenAbstract:This study aims to conduct a thorough investigation of the die shift of the reconstituted molded wafer for fan-out wafer level packaging (FOWLP) during the fabrication process. Both the fluid flow and thermo-mechanical effects are accounted for, where the former is simulated through the coupled fluid-structure analysis for exploring the die shift caused by the flow-induced drag forces, and the latter through process modeling for determining the die shift caused by the process-induced thermal-mechanical deformations. The effects of the temperature/conversion-dependent viscosity and cure shrinkage of the molding compound (MC), and the high temperature mold Tape Adhesive behavior on the die shifts are explored. The study starts from experimental characterization of the material properties, namely the high temperature mechanical properties of the mold Tape Adhesive, and the temperature-dependent Young's modulus and coefficient of thermal expansion of the MC. In addition, the cure state of the MC during compression molding and the corresponding cure kinetics model are established using differential scanning calorimetry tests together with mathematical modeling. Moreover, the temperature/conversion-dependent viscosity mathematical model is constructed using the developed cure kinetics model along with the measured MC's viscosity data The modeled die shift and warpage are compared against the online measurement data. Finally, the effects of some process, geometry and material parameters on the die shifts are also examined.
James P. Malone - One of the best experts on this subject based on the ideXlab platform.
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An Anatomic Model for Use in Surgical Skills Training of Tracheotomy
Otolaryngology-Head and Neck Surgery, 2011Co-Authors: Amy Ingram, Jennifer A. Bartlett, James P. MaloneAbstract:Objective: The objective would be to design a low cost, reproducible anatomic model to simulate tracheotomy in the surgical skills training laboratory. The model was adapted from a base model used previously for verification of proficiency (VOP) assessment of cricothyrotomy by general surgery residents.Method: The following materials were used: ventilator tubing, vessel loops, a 2x4x9-inch block of wood, red and white felt fabric, automotive ceiling headliner, cardboard, foam Tape, Adhesive spray, and foam. All materials were found easily at a local craft store or in medical discard.Results: The model was assembled by securing ventilator tubing to a block of wood to represent the trachea. Thyroid and cricoid cartilages were fashioned and secured to ensure palpable landmarks. An anterior section of ventilator tubing was removed and replaced with foam Tape to allow for a recyclable base. Finally, the thyroid and superficial tissue (including vessels and strap muscles) were assembled using headliner, felt, a...
Stefan Johansson - One of the best experts on this subject based on the ideXlab platform.
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Soft micromolding and lamination of piezoceramic thick films
Sensors and Actuators A-physical, 2002Co-Authors: Tobias Rosqvist, Stefan JohanssonAbstract:Combining ceramic thick film technology and lithographically based microstructuring technology we have performed micromolding of PZT thick films with lateral features down to 10 μm and aspect ratios up to 7:1 using soft reusable polydimethylsiloxane (PDMS) molds replicated from SU-8 resist masters. For multilayer applications microstructured Tapes were laminated using a green Tape Adhesive and low pressure to preserve dimensional stability. Single and multilayer bodies were fired and the resulting microstructures were studied. The presented work proves it possible to integrate channel microstructuring with multilayer ceramic technology opening up for numerous applications in areas of actuators, fluid handling components and ultrasonic transducers. Related microstructuring techniques for powder-based ceramics are compared regarding reached resolution and aspect ratio.
Michael H. Beck - One of the best experts on this subject based on the ideXlab platform.
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FS01.4 Hailey Hailey disease – a significant hazard to consider when patch testing
Contact Dermatitis, 2008Co-Authors: Stephen Walker, Jason Williams, J. B. O'driscoll, Michael H. BeckAbstract:A 42 year old man was referred to the Contact Dermatitis Investigation Unit because of a 12 month history of an inflammatory eruption affecting his neck. He was patch tested to our standard series, textile series and his own medicaments. At the 48 hour reading the patches were removed and there were large areas of unusual painful superficial erosions where the patch test Tape – Scanpora had been in contact with the skin. This appearance was difficult to explain. He denied interfering with the patches. The erosions were dressed with non-adherent dressings held in place by a different Tape- Microporea. At the 96 hour reading these dressings were removed and in the areas under the Microporea Tape there were further erosions around the edge and also some thin walled vesicles and small bullae. There were ++ allergic reactions to sodium metabisulphite, disperse blue 35, 124 and 106 all of which were felt to be relevant as he had used Trimovateâ cream and regularly wore dark nylon clothing when refereeing lacrosse matches. A biopsy was taken for histology and immunofluorescence from an area of blistering. This demonstrated suprabasal acantholysis with vesicle formation. There were occasional corps ronds. The immunofluorescence was negative. Anti-epidermal (skin) antibodieswere also negative. This striking and alarming clinical presentation after removal of patch tests had been encountered once previously in our Contact Dermatitis Investigation Unit. The possibility that the disorder was artefactual either due to an irritant introduced under the Tapes or perhaps due to a contaminant within the Tape Adhesive was considered but no conclusion was reached In this case the clue to diagnosis became apparent at the second patch test reading when small vesicles and bullae could be seen at the edge of where the Microporeâ had been. A diagnosis of Hailey Hailey disease (HHD) trigered by the trauma caused by the Adhesive Tapes and their removal was made. The relatively persistent nature of his presenting problem makes Grover’s disease less likely. The affected sites healed after two weeks. Allergic contact dermatitis particularly to medicaments is reported to be a frequent complication and routine patch testing has been advocated1. There has been a previous report of blistering at the site of patch testing however he was an individual already known to have HHD2. Despite having patch tested around 30 000 people in the last 22 years this complication had not been encountered until this year. We present this case whose clinical features are distinctive as we feel similar instances may have been or will be seen by colleagues. Diagnosis may be difficult if there are no blisters in association with the painful erosions.
Stephen Baumgart - One of the best experts on this subject based on the ideXlab platform.
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Acute Problems of Prematurity: Balancing Fluid Volume and Electrolyte Replacement in Very Low Birth Weight and Extremely Low Birth Weight Neonates
2012Co-Authors: Stephen BaumgartAbstract:Abstract In this chapter, we will discuss three problem areas for achieving fluid and electrolyte balance in the extremely low birth weight (ELBW) infant less than 1000 g at birth, and for his/her historical predecessor, the very low birth weight (VLBW) infant less than 1500 g at birth. The most recent clinical research on fluid and electrolyte therapy addresses these groups as separate; however, the principles for achieving fluid balance in each group represent the same physiology at different phases of fetal development. The first of these problems is poor epidermal barrier function. Especially in ELBW babies, thin, gelatinous skin promotes rapid transcutaneous evaporation, producing severe electrolyte disturbances in the first few days of life as well as presenting a poor barrier to the invasion of infections, and is also subject to trauma from Tape/Adhesive injury and from routine contact with bedclothes and handling. A second area of major concern is pulmonary edema formation. Increased lung water (pulmonary edema) has been suggested in the pathogenesis of several conditions (including patent ductus arteriosus [PDA], with congestive heart failure, and bronchopulmonary dysplasia [BPD]), leading to the controversy of fluid restriction versus fluid replenishment in preventing chronic lung disease in both VLBW and ELBW babies. Also controversial is the routine use of diuretics and steroids for the treatment of pulmonary edema with acute respiratory distress syndrome (RDS) and with BPD and chronic lung disease. Finally, a relatively new area of concern is the neurodevelopmental outcome of those infants manifesting severe electrolyte imbalances early in life, particularly in those who develop hyponatremia or hypernatremia/hyperosmolality in the first few weeks.
