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Total synthesis of iejimalide B. Q Chen, D Schweitzer, J Kane, VJ Davisson, P Helquist. The Journal of organic chemistry 76 (13), 5157-5169. , 2011. 39. 2011. The use of an acetoacetyl‐Co A synthase in place of a β‐ketothiolase enhances poly‐3‐hydroxybutyrate production in sugarcane mesophyll cells.
Feb 12, 2024 · Dirk Schweitzer, formerly CEO of Splendid Medien, is the new CEO of Cologne studio MMC, charged with expanding the studio's international profile.
Aug 9, 2021 · 1 person has recommended Dr. Dirk. Experienced Chemist with hands-on expertise in (alphabetical order): <br>Chemicals for…. · Experience: Impact Nano · Education: University of Washington ...
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Jul 25, 2014 · Check out professional insights posted by Dr. Dirk Schweitzer, Earth Citizen since 328 ppm CO2. Experienced Chemist/Scientist: New Product Development; Optimize Current Products; Process ...
- Introduction
- Effective Heat Spreading Profile
- Effective Heat Spreading Angle
- Benefits of The Effective Heat Spreading Concept
- Final Remark
- References
To accurately compute the thermal resistance of a layered structure, such as the Junction-to-Case thermal resistance of a power semiconductor, the heat spreading inside the structure has to be considered. The calculation of the spreading resistance is not a trivial problem and analytical solutions exist only for extremely simple geometries. Using F...
To explain this concept we consider a silicon chip on a copper (Cu) leadframe as shown in figure 1. A power of PH = 10 W is dissipated homogeneously on an active area of 1.01.0 mm2 on the 3.03.0 mm2 chip whereas the bottom temperature of the leadframe is kept constant (ideal cooling). Monitoring the local heat flux density p(x) from the center of...
Based on the effective heat spreading profile y(x) the corresponding effective spreading angle can be easily computed (figure 5): Using Equation (2) we obtain for the heat spreading cone with square cross section:
The attentive reader will now object: That is all well and good but how do I know the heat flux density p(x) along the heat flow path which is required to calculate the effective spreading profile? Which is a valid objection since p(x) can only be obtained by Finite Element (FE) simulation. There would be little motivation to perform a FE simulatio...
We could also try to define the spreading cone by a surface that intersects all isothermals at 90° angle thus ensuring zero heat flux across that border. But contrary to the approach presented above the resulting heat spreading cone would be useless when it comes to computing the associated thermal resistance since the heat flow density over parall...
1. Clemens J.M. Lasance, “Heat Spreading – Not a trivial Problem”, Electronics Cooling, Vol. 14, No. 2, May 2008. 2. Bruce Guenin, “The 45° Heat Spreading Angle – An Urban Legend?”, Electronics Cooling, Vol. 9, No. 4, Nov. 2003. 3. Yasushi Koito, Shoryu Okamoto, and Toshio Tomimura, “Two dimensional numerical investigation on applicability of 45° h...
Dirk Schweitzer's 12 research works with 377 citations and 2,767 reads, including: On the Reproducibility of Thermal Measurements and of Related Thermal Metrics in Static and Transient Tests of ...
Dirk Schweitser movie reviews & film summaries | Roger Ebert
