The Association for Computing Machinery (ACM) is a US-based international learned society for computing. It was founded in 1947 and is the world's largest scientific and educational computing society. The ACM is a non-profit professional membership group, claiming nearly 110,000 student and professional members as of 2022. Its headquarters are in New York City.
A crystal oscillator is an electronic oscillator circuit that uses a piezoelectric crystal as a frequency-selective element. The oscillator frequency is often used to keep track of time, as in quartz wristwatches, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers. The most common type of piezoelectric resonator used is a quartz crystal, so oscillator circuits incorporating them became known as crystal oscillators. However, other piezoelectricity materials including polycrystalline ceramics are used in similar circuits.
A rubidium standard or rubidium atomic clock is a frequency standard in which a specified hyperfine transition of electrons in rubidium-87 atoms is used to control the output frequency.
A crystal filter allows some frequencies to 'pass' through an electrical circuit while attenuating undesired frequencies. An electronic filter can use quartz crystals as resonator components of a filter circuit. Quartz crystals are piezoelectric, so their mechanical characteristics can affect electronic circuits. In particular, quartz crystals can exhibit mechanical resonances with a very high Q factor. The crystal's stability and its high Q factor allow crystal filters to have precise center frequencies and steep band-pass characteristics. Typical crystal filter attenuation in the band-pass is approximately 2-3dB. Crystal filters are commonly used in communication devices such as radio receivers.
In signal processing, the chirplet transform is an inner product of an input signal with a family of analysis primitives called chirplets.
A thin-film bulk acoustic resonator is a device consisting of a piezoelectric material manufactured by thin film methods between two conductive – typically metallic – electrodes and acoustically isolated from the surrounding medium. The operation is based on the piezoelectricity of the piezolayer between the electrodes.
Doubly fed electric machines, also slip-ring generators, are electric motors or electric generators, where both the field magnet windings and armature windings are separately connected to equipment outside the machine.
A capacitive micromachined ultrasonic transducer (CMUT) is a relatively new concept in the field of ultrasonic transducers. Most of the commercial ultrasonic transducers today are based on piezoelectricity. CMUTs are the transducers where the energy transduction is due to change in capacitance. CMUTs are constructed on silicon using micromachining techniques. A cavity is formed in a silicon substrate, and a thin layer suspended on the top of the cavity serves as a membrane on which a metallized layer acts an electrode, together with the silicon substrate which serves as a bottom electrode.
Leonard Cutler (1928–2006), also known as Leonard S. Cutler, was a pioneer and authority on ultra-precise timekeeping devices and standards, and was well known for his work with quantum-mechanical effects. He was the co-inventor of the HP5060A Cesium Beam Clock, its successor the HP 5071A, and the two-frequency laser inferometer. He has also been praised for his crucial contributions to the design of the Allen Telescope Array.
Mack Alfred Breazeale was an American physicist particularly known for his work in ultrasonics and physical acoustics. Breazeale is widely regarded as one of the leading acousticians of the 20th century, highly accomplished in both theory and experiment. When he died, he was a retired Distinguished Research Professor and Senior Scientist at the National Center for Physical Acoustics at the University of Mississippi. Born in Leona Mines, Virginia, Breazeale grew up near Crossville, TN. Educated at Berea College, the Missouri School of Mines, and the Michigan State University, he was a tireless researcher and trained many others in the field of physics. Before his appointment at the National Center for Physical Acoustics, he was professor of physics at the University of Tennessee (1962-1995) and at Michigan State University (1957-1962). A longtime editor of the Journal of the Acoustical Society of America, he was a fellow of the Acoustical Society of America (ASA) and received its Silver Medal in 1988. He was a fellow of the Institute of electrical and Electronics Engineers and Great Britain's Institute of Acoustics, and had been a Fulbright Research Fellow in Stuttgart, Germany early in his career.
David Wayne Allan is an American atomic clock physicist and author of the Allan variance, also known as the two-sample variance, a measure of frequency stability in clocks, oscillators and other applications. He worked for the National Bureau of Standards in Colorado.
Time Slotted Channel Hopping or Time Synchronized Channel Hopping (TSCH) is a channel access method for shared-medium networks.
ACM SIGARCH is the Association for Computing Machinery's Special Interest Group on computer architecture, a community of computer professionals and students from academia and industry involved in research and professional practice related to computer architecture and design. The organization sponsors many prestigious international conferences in this area, including the International Symposium on Computer Architecture (ISCA), recognized as the top conference in this area since 1975. Together with IEEE Computer Society's Technical Committee on Computer Architecture (TCCA), it is one of the two main professional organizations for people working in computer architecture.
Non-orthogonal frequency-division multiplexing (N-OFDM) is a method of encoding digital data on multiple carrier frequencies with non-orthogonal intervals between frequency of sub-carriers. N-OFDM signals can be used in communication and radar systems.
Susan Trolier-McKinstry is an American materials scientist. She is the Steward S. Flaschen Professor of Materials Science and Engineering and Electrical Engineering at Pennsylvania State University, Director of the W. M. Keck Smart Materials Integration Laboratory, and co-director of the Nanofabrication facility.
James (Jim) Gegan Miller is an American physicist, engineer, and inventor whose primary interests center around biomedical physics. He is currently a professor of physics, Medicine, and Biomedical Engineering, emeritus, at Washington University in St. Louis, where he holds the Albert Gordon Hill Endowed Chair in the Faculty of Arts and Sciences. He is notable for his interdisciplinary contributions to biomedical physics, echocardiography, and ultrasonics.
Warren A. Marrison was a Canadian engineer and inventor. Marrison was the co-inventor of the first Quartz clock in 1927.
Dragan Damjanovic is a Swiss-Bosnian-Herzegovinian materials scientist. From 2008 to 2022, he was a professor of material sciences at EPFL and head of the Group for Ferroelectrics and Functional Oxides.
John Vig is a physicist, executive and inventor. His career has been with the U.S. Army Research Lab and he has also been active with the IEEE and is known for his inventions in UV-ozone cleaning, chemical polishing of quartz surfaces, polyimide bonding of resonators and noise in MEMS.
