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PCBD-Nov2014

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November 2014 • The PCB Design Magazine 39 Dr. istvan Novak is a distin- guished engineer at oracle, working on signal and power integrity designs of mid-range servers and new technology de- velopments. With 25 patents to his name, Novak is co-author of "Frequency- Domain Characterization of Power Distribu- tion Networks." To read past columns, or to contact Novak, click here. we improve the connection of the capacitor by driving L c down, we also make these structural resonances more pronounced. As we demonstrated, in spite of their physi- cally small sizes, ceramic capacitors can exhibit structural resonances, too. If you want to read more on the subject, check out the cited refer- ences. PCBDESIGN References 1. "A Black-Box Frequency Dependent Mod- el of Capacitors for Frequency Domain Simula- tions," DesignCon 2005 East, High-Performance System Design Conference, Worcester, MA, Sep- tember 19–22, 2005, available here. 2. Grid sweep projected view, available here. 3. "Slow Wave Causal Model for Multi Layer Ceramic Capacitors," DesignCon 2006, Santa Clara, CA, February 6-9, 2006, available here. by Real Time with... NEPCON South China automotive, aerospace, and machinery in- dustries, among others, are resorting more and more to the use of 3D printing methods to pro- duce manufacturing components. There is a strong demand that the technologies involved in this process produce parts with stronger func- tional properties. This requires the development of new adaptable materials. researchers at the university of lorraine in France say that quasicrystals, a type of complex metal alloy with crystal-like properties, can be useful in the design of new composite materials for this purpose. in a review published by sci- ence and Technology of ad- vanced Materials, samuel Ken- zari and co-authors summarized recent developments related to the use of complex metal alloys in additive manufacturing. additive manufacturing, commonly thought of as 3D printing, is a process that in- volves the manufacture of components from a digital model. in additive manufactur- ing, lasers are employed to build layers based on a digital model, ultimately resulting in the final component. additive manufacturing methods are be- coming widespread and affect many indus- tries. in 2012, they generated global revenues of $2.2 billion. But the range of materials used is still restricted despite a real demand for man- ufacturing lighter parts with better functional properties. incorporating complex metal alloys (CMas), such as quasicrystals, in the design of new com- posite materials can help meet this demand. Complex metal alloys are promising because of their potentially useful properties such as low friction, relatively good corrosion resistance, and good resistance to wear. They are also, however, intrinsically brittle, preventing their use as bulk materials. sci- entists, reports the university of lorraine team of research- ers, have found alternatives to circumvent this problem. one is to use CMas as reinforce- ment particles. The other is to use them as a coating material. The researchers are cur- rently working on the develop- ment of functional parts made using CMas that have health applications. 3D Printing Incorporates Quasicrystals VERTICAL RESONANCES IN CERAMIC CAPACITORS continues quiet power

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