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MY'STORY

The MOVE Fire

This is a personal recollection on the Move fire on May 13, 1985 Philadelphia police fired thousands of rounds at the MOVE house, city officials approved dropping an explosive device on the roof, the resulting fire was allowed to burn, 11 people—including five children—died, and 61 homes were destroyed. Philadelphia City Council later called it a “brutal attack carried out by the City of Philadelphia on its own citizens” and acknowledged that no individual faced criminal consequences for the bombing. One timeline correction worth preserving for the BHP record: the major previous MOVE-police confrontation was August 8, 1978, about seven years before the bombing, not a year or two earlier. Officer James Ramp was killed, other police and firefighters were wounded, nine MOVE members were later convicted, and television cameras recorded police beating Delbert Africa during his arrest. The 1985 MOVE Commission later specifically criticized city planners for failing to adequately use lessons from that 1978 confrontation. And that actually strengthens the point you’re making: 1985 did not happen without precedent or institutional memory. There had already been a deadly confrontation with MOVE, years of conflict, negotiations and police involvement before Osage Avenue.

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BLACK FACTS
The Truths They Never Taught You...

Katherine Johnson — Mathematics to the Moon

Katherine Johnson’s mathematical calculations helped guide some of America’s most important early space missions while she confronted the racial and gender barriers faced by Black women in twentieth-century America.

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Wikipedia

Ansys HFSS

Ansys HFSS
Websitewww.ansys.com Edit this on Wikidata
Example VSWR and return loss as simulated by HFSS. Parameters such as these are used to quantify and predict antenna performance, such as bandwidth. [1]

Ansys HFSS (high-frequency structure simulator)  is a commercial finite element method solver for electromagnetic (EM) structures from Ansys.[1]

Engineers use Ansys HFSS primarily to design and simulate high-speed, high-frequency electronics in radar systems, communication systems, satellites, ADAS, microchips, printed circuit boards, IoT products, and other digital devices and RF devices. The solver has also been used to simulate the electromagnetic behavior of objects such as automobiles and aircraft. ANSYS HFSS allows system and circuit designers to simulate EM issues such as losses due to attenuation, coupling, radiation and reflection.[2]

The benefits of simulating a circuit's high frequency behavior with high accuracy on a computer reduce the final testing and verification effort of the system as well as mitigating the necessity of building multiple costly prototypes, saving both time and money in product development.[3]

History

[edit]

HFSS was originally developed by Professor Zoltan Cendes, Ph.D., and his students at Carnegie Mellon University. It was the first general purpose software product to solve arbitrary 3D EM field problems,[4] including EM energy distribution and S parameters in complex structures.

In 1984, Dr. Cendes founded Ansoft Corporation to design and develop high performance EDA software. He served as its chairman and chief technology officer until 2008, when Ansys acquired Ansoft.[5][6]

Ansoft originally sold HFSS as a stand-alone product under an agreement with Hewlett-Packard. It was also bundled into Ansoft products.[5]

In 1997 Hewlett-Packard acquired Optimization Systems Associates Inc. (OSA), a company John Bandler founded in 1983. HP's acquisition was driven by HP's need for an optimization capability for HFSS.[7][8] After various business relationships over the period 1996–2006, HP (which became Agilent EEsof EDA division) and Ansoft went their separate ways:[9]

Over time, Ansys HFSS introduced a number of new technologies in computational EM simulation, including automatic adaptive mesh generation, tangential vector finite elements, transfinite elements, and reduced-order modeling.[10]

References

[edit]
  1. ^ a b I. Sliusar, V. Slyusar, S. Voloshko, A. Zinchenko, Y. Utkin. Synthesis of a Broadband Ring Antenna of a Two-Tape Design. // 12th International Conference on Antenna Theory and Techniques (ICATT-2020), 22 – 27 June 2020, Kharkiv, Ukraine.
  2. ^ "ANSYS HFSS: Everything to Know - Explore the Future of Engineering: 3D Modeling, CAD and More". 2020-01-04. Archived from the original on March 7, 2021. Retrieved 2022-03-04.
  3. ^ "Latest HFSS Release Improves Speed and Accuracy". www.microwavejournal.com. Retrieved 2022-03-04.
  4. ^ Cendes, Zoltan (2016-06-01). "The development of HFSS". 2016 USNC-URSI Radio Science Meeting. pp. 39–40. doi:10.1109/USNC-URSI.2016.7588501. ISBN 978-1-5090-2852-8. S2CID 22308192.
  5. ^ a b Q&A With Zoltan Cendes, Founder, Chairman, And CTO Of Ansoft Corporation, by Jim Pomager, Editor in Chief, RF Global Net Archived 2007-10-27 at the Wayback Machine
  6. ^ EDN (21 August 2001). "Ansoft Purchases High-frequency Structure Simulator (HFSS) Product Line from Agilent Technologies".
  7. ^ "HP Acquires Optimization Systems Associates, Expands CAE Software Portfolio". Archived from the original on 2017-01-26. Retrieved 2016-12-11.
  8. ^ "Empipe3D, Version 3.5, Technical Brief". Archived from the original on 1997-05-15. Retrieved 2022-07-14.
  9. ^ "...In July 2001 Ansoft announced that it would purchase Agilent's HFSS product line..." Answers.com. Archived from the original on 2013-11-04. Retrieved 2008-02-14.
  10. ^ Cendes, Zoltan (June 2016). "The development of HFSS". 2016 USNC-URSI Radio Science Meeting. pp. 39–40. doi:10.1109/USNC-URSI.2016.7588501. ISBN 978-1-5090-2852-8. S2CID 22308192.
[edit]

Source: Wikipedia. Article content is retrieved live through the MediaWiki API.

Wikipedia

Ansys HFSS

Ansys HFSS (high-frequency structure simulator) is a commercial finite element method solver for electromagnetic (EM) structures from Ansys. Engineers use Ansys HFSS primarily to design and simulate high-speed, high-frequency electronics in radar systems, communication systems, satellites, ADAS, microchips, printed circuit boards, IoT products, and other digital devices and RF devices. The solver has also been used to simulate the electromagnetic behavior of objects such as automobiles and aircraft. ANSYS HFSS allows system and circuit designers to simulate EM issues such as losses due to attenuation, coupling, radiation and reflection. The benefits of simulating a circuit's high frequency behavior with high accuracy on a computer reduce the final testing and verification effort of the system as well as mitigating the necessity of building multiple costly prototypes, saving both time and money in product development.

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Wikipedia

HFSS

HFSS or HfSS may refer to: High-frequency structure simulator, a high frequency electromagnetic simulation software, see Ansys HFSS High in fat, sugar and salt, food products that are high in fat, sugar or salt, see junk food Hochschule für Sozialpädagogik und Sozialökonomie, a predecessor of the City University of Applied Sciences in Bremen, Germany Heart failure survival score, a multivariable predictive index that risk-stratifies patients with chronic heart failure referred for heart transplantation

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Wikipedia

Standing wave ratio

In radio engineering and telecommunications, standing wave ratio (SWR) is a measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide. Impedance mismatches result in standing waves along the transmission line, and SWR is defined as the ratio of the partial standing wave's amplitude at an antinode (maximum) to the amplitude at a node (minimum) along the line. Voltage standing wave ratio (VSWR) (pronounced "vizwar") is the ratio of maximum to minimum voltage on a transmission line . For example, a VSWR of 1.2 means a peak voltage 1.2 times the minimum voltage along that line, if the line is at least one half wavelength long. A SWR can be also defined as the ratio of the maximum amplitude to minimum amplitude of the transmission line's currents, electric field strength, or the magnetic field strength. Neglecting transmission line loss, these ratios are identical. The power standing wave ratio (PSWR) is defined as the square of the VSWR, however, this deprecated term has no direct physical relation to power actually involved in transmission. SWR is usually measured using a dedicated instrument called an SWR meter. Since SWR is a measure of the load impedance relative to the characteristic impedance of the transmission line in use (which together determine the reflection coefficient as described below), a given SWR meter can interpret the impedance it sees in terms of SWR only if it has been designed for the same particular characteristic impedance as the line. In practice most transmission lines used in these applications are coaxial cables with an impedance of either 50 or 75 ohms, so most SWR meters correspond to one of these. Checking the SWR is a standard procedure in a radio station. Although the same information could be obtained by measuring the load's impedance with an impedance analyzer (or "impedance bridge"), the SWR meter is simpler and more robust for this purpose. By measuring the magnitude of the impedance mismatch at the transmitter output it reveals problems due to either the antenna or the transmission line.

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Wikipedia

Computational physics

Computational physics is the study and implementation of numerical analysis to solve problems in physics. Historically, computational physics was the first application of modern computers in science, and is now a subset of computational science. It is sometimes regarded as a subdiscipline (or offshoot) of theoretical physics, but others consider it an intermediate branch between theoretical and experimental physics — an area of study which supplements both theory and experiment.

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TOPIC OF THE DAY

Greenwood / Black Wall Street

Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.

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TRIVIA QUESTION OF THE DAY

Which Supreme Court case ruled state-sponsored public-school segregation unconstitutional?

Brown v. Board of Education in 1954.