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16 SMT007 MAGAZINE I FEBRUARY 2019 All in all, when Ag, Cu, and Bi can "comfort- ably" reconcile together within the Sn matrix, and when each element is at its optimal dos- age, the system delivers wonders. SMT007 References 1. H-Technologies Group Inc., "Internal Reports," 1990– 1999. 2. Jennie S. Hwang, Environment-Friendly Electronics: Lead-Free Technology (Chapter 10), Electrochemical Pub- lications LTD, Great Britain, 2001. Dr. Hwang, an international business- woman and speaker, and business and technology advisor, is a pioneer and long-standing contributor to electronics hardware manufactur- ing as well as to the environment- friendly lead-free electronics implementation. Among her many awards and honors, she was inducted to the International Hall of Fame—Women in Technology, elected to the National Academy of Engineering, an R&D-Stars- to-Watch, and YWCA Achievement Award. Having held senior executive positions with Lockheed Martin Corp., Sherwin Williams Co., SCM Corp, and CEO of International Electronic Materials Corp., she is currently CEO of H- Technologies Group providing business, technology and manufacturing solutions. She is the Chairman of Assess- ment Board of DoD Army Research Laboratory, serving on Commerce Department's Export Council, National Materi- als and Manufacturing Board, Army Science and Technol- ogy Board, various national panels/committees, interna- tional leadership positions, and the board of Fortune-500 NYSE companies and civic and university boards. She is the author of 500+ publications and several books, and a speaker and author on trade, business, education, and social issues. Her formal education includes four academic degrees as well as Harvard Business School Executive Program and Columbia University Corporate Governance Program. For more information, please visit To read past columns or contact Hwang, click here. To make modern communications possible, today's mobile devices make use of components that use acous- tic waves to filter or delay signals. However, current so- lutions have limited functionalities that prevent further miniaturization of mobile devices and constrain the avail- able communication bandwidth. Now, a research team led by Chiara Daraio, Caltech professor of mechanical engineering, has developed pho- nonic devices that could find uses in new kinds of sen- sors, improved cellphone technologies applied physics, and quantum computing. The phononic devices in- clude parts that vibrate ex- tremely fast, moving back and forth up to tens of mil- lions of times per second. The team developed these devices by creating silicon nitride drums that are just 90-nm thick. The drums are arranged into grids with dif- ferent grid patterns having different properties. Daraio, along with former Caltech postdoctoral scholar Jinwoong Cha, showed that arrays of these drums can act as tunable filters for signals of different frequencies. They also showed that the devices can act like one-way valves for high-frequency waves. The ability to transmit waves in only one direction helps keep the signal stronger by reducing interference. These findings open opportunities to design new de- vices—such as phononic transistors and radio-frequency isolators—based on phonons instead of electrons. Their findings appear in two papers published in Nature Nano- technology and Nature. Support for the research was provided by the Na- tional Science Foundation, the Binnig and Rohrer Nano- technology Center at IBM Research—Zurich, and the Kavli Nanoscience Institute at Caltech. (Source: California Insti- tute of Technology) Phononic Devices Could Allow Smaller Mobile Devices

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