https://padlet.com/azeng2019/secondary_research For CAPStone en-us 2018-10-08 20:46:54 UTC 2018-10-08 21:31:13 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Diskette.png azeng2019 https://padlet.com/azeng2019/secondary_research/wish/290492587 Three of the authors, Dr. Thomas A. Campbell, who specializes in nanocomposites research, Dr. Christopher B. Williams, who received the 2010 Emerald Engineering Outstanding Doctoral Research Award in additive manufacturing, and Dr. Olga S. Ivanova, whose research is on nanocomposites in additive manufacturing, work at Virginia Tech. These three worked alongside Dr. Banning Garrett, a director for many of the programs at the Atlantic Council, to create Strategic Foresight Report based on the effects of 3D printing and additive manufacturing on the world. This report, published by the think tank Atlantic Council, introduces two unique ideas of the effects on additive manufacturing, among other ideas posed in the article, being that its presence can add to the forefront of research development in disciplines such as NBIC (nanotechnology, biotechnology, information technology, and cognitive sciences) and that it can pose a disruption to traditional manufacturing and the economy. The article definitely seems to have a bias that additive manufacturing will be extremely good for the world, although they do make counterpoints and try to stay objective about facts.]]> 2018-10-08 21:01:45 UTC https://padlet.com/azeng2019/secondary_research/wish/290492587 azeng2019 https://padlet.com/azeng2019/secondary_research/wish/290492915 Major Source - purple
Supporting Source - blue]]> 2018-10-08 21:03:13 UTC https://padlet.com/azeng2019/secondary_research/wish/290492915 azeng2019 https://padlet.com/azeng2019/secondary_research/wish/290493130 This book, written by Hod Lipson, a professor of Mechanical Engineering at Columbia University and director of the university's Creative Machines lab, and Melba Kurman, an author who focuses on technology’s impact on our society, focuses on the changes in the world due to the adoption of 3D printing into all walks of life. Inside the book, the authors explain ten principles of 3D printing that were recurring ideas from their research. These ten principles are the ideas that allow 3D printing to be utilized effectively and efficiently. Lipson shares one of his stories where he was working with a colleague who was doing research on cuneiforms in the Middle East. Saddened that he may not be able to bring data home, the two experimented with CT scanning cuneiforms and sending the data files to a 3D printer at home to be replicated. This endeavor worked, permitting the colleague to keep an close copy of the rare cuneiforms at home while the governments kept the real ones.]]> 2018-10-08 21:04:16 UTC https://padlet.com/azeng2019/secondary_research/wish/290493130 azeng2019 https://padlet.com/azeng2019/secondary_research/wish/290493224 Written by Bjørn Kolbrek, this article from audioXPRESS provides an introduction into different types of horns and their perks. One interesting thing he mentions is that “a certain minimum mouth area is required to minimize reflections at the open end. This area is larger for horns intended for low frequency use (it depends on the wavelength), which means that a conical horn would need to be very long to provide satisfying performance at low frequencies. As such, the conical expansion is not very useful in bass horns. Indeed, the conical horn is not very useful at all in applications requiring good loading performance, but it has certain virtues in directivity control.” The loading performance is the ratio of the diaphragm area to the throat area. This blurb means, in application to tubas, that with a conical horn, the projection of the tuba will be very good, however, the efficiency of the player’s buzzing to sound will not be so good. Due to the long length of the tuba, the efficiency of the tuba may be better than with a shorter horn. ]]> 2018-10-08 21:04:48 UTC https://padlet.com/azeng2019/secondary_research/wish/290493224 azeng2019 https://padlet.com/azeng2019/secondary_research/wish/290493355 This informative article written by David Werden, who was the euphonium soloist of the United States Coast Guard Band for 26 years, talks about compensating valve systems. Although he specializes in euphonium and primarily writes this for euphonium, compensating valves also can be found on tubas. He talks about the science behind these valve systems, particularly in playing a note exactly in tune. The three valves on a brass instrument are made to extend the tubing of the brass instrument by a certain amount that would make the note in tune exactly for those notes. For example, when the second valve is pressed, an additional 6% of tubing will be appended to the instrument, making a 100” long tube become about 106”. A problem arises when using multiple valves to lower the instrument, such as the valve combination 1 and 3. Pressing this combination would give 100(1.059^3-1)+100(1.059-1)+100=124.86" of tubing, but you would need 100(1.059^4-1)+100=125.99" of tubing to be exactly in tune. Compensating valve systems make the instrument more in tune by adding additional tubing to make the instrument longer with those valve combinations.]]> 2018-10-08 21:05:25 UTC https://padlet.com/azeng2019/secondary_research/wish/290493355