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10 February 2009
Brain Teaser Challenge - "January"
by Butch Shadwell
Have you ever wanted to be a tap dancer? I hadn’t thought about it much until I saw Michael Flatley and his team in River Dance. It is literally poetry in motion. As I watched the show I could feel the Irish branch of my family tree swaying to the music.
Some of you may recall that I am a bit of a thespian. I have been in over 65 shows including 6 musicals. Though I have done a little tripping over the floor boards, I haven’t ever done any tap. However, I have seen how they mike tap performances. They use a device known as a PZM or pressure zone microphone. This type of mike has a design that limits how much sound is generated by vibration or movement of the microphone assembly itself. There is a small pressure zone sensor that can pick up sounds that are carried from other directions than the mounting structure.
In a condenser microphone element if the increasing sound pressure increases the capacitance, what kind of voltage change is observed on the microphone element as a high pressure wave passes?
Reply to Butch Shadwell at b.shadwell@ieee.org (email)
904-223-4510 (fax)
904-223-4465 (v)
3308 Queen Palm Dr.
Jacksonville, FL 32250-2328.
www.shadtechserv.com
Have you ever wanted to be a tap dancer? I hadn’t thought about it much until I saw Michael Flatley and his team in River Dance. It is literally poetry in motion. As I watched the show I could feel the Irish branch of my family tree swaying to the music.
Some of you may recall that I am a bit of a thespian. I have been in over 65 shows including 6 musicals. Though I have done a little tripping over the floor boards, I haven’t ever done any tap. However, I have seen how they mike tap performances. They use a device known as a PZM or pressure zone microphone. This type of mike has a design that limits how much sound is generated by vibration or movement of the microphone assembly itself. There is a small pressure zone sensor that can pick up sounds that are carried from other directions than the mounting structure.
In a condenser microphone element if the increasing sound pressure increases the capacitance, what kind of voltage change is observed on the microphone element as a high pressure wave passes?
Reply to Butch Shadwell at b.shadwell@ieee.org (email)
904-223-4510 (fax)
904-223-4465 (v)
3308 Queen Palm Dr.
Jacksonville, FL 32250-2328.
www.shadtechserv.com
The names of correct respondents may be mentioned in the solution column.
February From The Chair
Hello to all members of the IEEE in the Hampton Roads Section. I will be your chairman for this upcoming year. I am excited to serve you in this capacity. I work at Norfolk Naval Shipyard as a Nuclear Engineer although my degree is in Electrical Engineering from Old Dominion University. My first order of business is to thank Kurt Clemente for serving as Hampton Roads Section Chair for the past two years. Kurt brought many items to the table that we worked on as your Executive Committee, but I believe the biggest one is the requirement for continuing education for professional engineers. Our technical talks fit the requirement for continuing education. As chairman for the section it is my goal that the executive committee of the Hampton Roads Section supports you in this requirement for maintaining your license as a professional engineer. I know that this is one of the foremost ideas that Kurt mentioned in the executive meetings, in fact I cannot remember an executive meeting over the past two years in which this topic was not discussed. Once again, thank you Kurt for your service over the past two years.
Secondly, I want to congratulate the winners of our Student Paper presentation held in January at Christopher Newport University. One of the many topics that is discussed in executive committee is how can we get more involved with the student groups. I realize that it will be difficult but not overwhelming. In addition, the executive committee is looking at how we conduct the student paper presentation as turnout has been lower than expected.
The Section will be celebrating it’s 50th anniversary in 2011. I will be forming an ad hoc committee that will be developing the program for this event. My plan is to meet outside of executive committee and the normal technical program to work on this. This ad hoc committee will be open to all members, especially any member who has event planning experience. I would like to have at least 4 additional members for the committee. Please contact me directly if you are interested in helping. We will be providing a report to the executive committee. Our February technical meeting will be on UHF Radio Frequency Identification (RFID) systems and will be held at Al Fresco’s in Newport News. Dr. Reddy, a Hampton Roads Senior Member of the IEEE, is actively involved in combining the technology of UHF RFID with computational electromagnetic tools, thereby increasing the range of the system. In March, we are planning a technical program on generators. We are open for April and if anyone has an idea for a program, please contact the Vice-Chairman, Greg Hodges, as he will be setting up the technical programs. May is our family social and there has been discussion of having the program coincide with Jefferson Labs open house.
I am looking forward to meeting everyone in February.
Regards,
James Bolitho
2009 Chair
Hampton Roads Section
jbolitho@ieee.org
Secondly, I want to congratulate the winners of our Student Paper presentation held in January at Christopher Newport University. One of the many topics that is discussed in executive committee is how can we get more involved with the student groups. I realize that it will be difficult but not overwhelming. In addition, the executive committee is looking at how we conduct the student paper presentation as turnout has been lower than expected.
The Section will be celebrating it’s 50th anniversary in 2011. I will be forming an ad hoc committee that will be developing the program for this event. My plan is to meet outside of executive committee and the normal technical program to work on this. This ad hoc committee will be open to all members, especially any member who has event planning experience. I would like to have at least 4 additional members for the committee. Please contact me directly if you are interested in helping. We will be providing a report to the executive committee. Our February technical meeting will be on UHF Radio Frequency Identification (RFID) systems and will be held at Al Fresco’s in Newport News. Dr. Reddy, a Hampton Roads Senior Member of the IEEE, is actively involved in combining the technology of UHF RFID with computational electromagnetic tools, thereby increasing the range of the system. In March, we are planning a technical program on generators. We are open for April and if anyone has an idea for a program, please contact the Vice-Chairman, Greg Hodges, as he will be setting up the technical programs. May is our family social and there has been discussion of having the program coincide with Jefferson Labs open house.
I am looking forward to meeting everyone in February.
Regards,
James Bolitho
2009 Chair
Hampton Roads Section
jbolitho@ieee.org
Watch Out for the Terminator
As the membership chair for the section I dread the end of February. This is when IEEE runs what they refer to as the ‘terminator’ program, a software routine that sweeps membership database looking for members that have renewed their membership. Any member that has not renewed their membership is placed in an inactive state. Many sections including Hampton Roads lose as much as ten percent of membership at this time. The significance is that inactive members miss the information they have come to depend. This includes emails and publications.
If you have not already done so, please submit your renewal before the end of February. Membership renewals can be made online at myieee.
By the way, life members should do this too. You may not need to pay but returning your renewal is the only way that IEEE has to keep you on their roles.
- William LaBelle
w.labelle@ieee.org
If you have not already done so, please submit your renewal before the end of February. Membership renewals can be made online at myieee.
By the way, life members should do this too. You may not need to pay but returning your renewal is the only way that IEEE has to keep you on their roles.
- William LaBelle
w.labelle@ieee.org
February Meeting
Design of UHF RFID Systems with the aid of Computational Electromagnetics
Dr. C. J. Reddy, President
EM Software & Systems (USA) Inc.
Al Fresco, Newport News
6:30 PM, Thursday, 19 February 2009
Dr. C. J. Reddy, President
EM Software & Systems (USA) Inc.
Al Fresco, Newport News
6:30 PM, Thursday, 19 February 2009
Please RSVP to officers-r3-hamptonroads@ieee.org or on line at www.acteva.com.
| Al Fresco 11710 Jefferson Ave., #A Newport News, VA 23606 +1 757 873 0644 Directions | Agenda 6:00 PM Executive Committee 6:30 PM Social Period 7:00 PM Dinner 8:00 PM Technical Presentation | Meal Costs Members $20 Guests $20 Students $10 Technical presentation is FREE. |
Though Radio Frequency Identification (RFID) systems have been in use for various applications in the past, currently they are gaining popularity due to their application to retail supply chain management systems. Compared to low-frequency (LF) and high-frequency (HF) RFID systems (which operate through near-field inductive coupling and thus have relatively short read range), ultra high frequency (UHF) RFID systems operate through farfield backscattering, have larger read range, and have been widely used in supply chain management and inventory control. However, very often the electromagnetic (EM) performance of the reader/tag systems could be significantly degraded due to the complex physical environments. With the aid of computational electromagnetic (CEM) tools, such situations can be analyzed and optimized to improve the performance of RFID systems. This talk presents options for the EM characterization of such systems with the aid of full wave or hybrid numerical methods. Analysis of RFID tags, readers, tag placement, tag/reader coupling, and tag/reader systems in complex environments will be addressed.
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