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vemsa3d 1.1 - a floss visual em simulator for 3d antennas
| From......: "Bill Miller"
| Newsgroups: sci.physics.electromag | Sent......: Wednesday, August 18, 2010 10:44 PM | Subject...: vemsa3d 1.1 - a floss visual em simulator for 3d antennas | | wrote in message ... | - | ... | | How does this work differ from NEC Numeric Electromagnetic Code for antenna | analysis? | | Bill Miller - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Dear Mr. Miller, VEMSA3D can not work differently, because it is based on the same theoretical method as NEC does, that is on the Method of Moments. However, since each of these numerical applications use a different basis of the current function space and since their corresponding computer programs use unavoidably finite linear combinations of them, in general, they produce different results. To be specific, the two bases details are included in the following: VEMSA3D current basis: J. H. Rischmond, Radiation and Scattering by Thin-Wire Structues in the Complex Freqeuncy Domain, (15), p.6 http://tinyurl.com/24zwycy NEC current basis: G. J. Burke, A. G. Poggio Numerical Electromagnetics Code - Method of Moments Equation (20), p. 11 http://www.si-list.net/NEC_Archives/nec2prt1.pdf Regards, Petros Zimourtopoulos |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
wrote in message ... | From......: "Bill Miller" | Newsgroups: sci.physics.electromag | Sent......: Wednesday, August 18, 2010 10:44 PM | Subject...: vemsa3d 1.1 - a floss visual em simulator for 3d antennas | | wrote in message ... | - | ... | | How does this work differ from NEC Numeric Electromagnetic Code for antenna | analysis? | | Bill Miller - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Dear Mr. Miller, VEMSA3D can not work differently, because it is based on the same theoretical method as NEC does, that is on the Method of Moments. However, since each of these numerical applications use a different basis of the current function space and since their corresponding computer programs use unavoidably finite linear combinations of them, in general, they produce different results. Can you quantify further or explain the nature of thes "different results?" Are there certain classes of antennas for which VEMSA3D might produce more accurate results than NEC? Thanks! Bill Miller To be specific, the two bases details are included in the following: VEMSA3D current basis: J. H. Rischmond, Radiation and Scattering by Thin-Wire Structues in the Complex Freqeuncy Domain, (15), p.6 http://tinyurl.com/24zwycy NEC current basis: G. J. Burke, A. G. Poggio Numerical Electromagnetics Code - Method of Moments Equation (20), p. 11 http://www.si-list.net/NEC_Archives/nec2prt1.pdf Regards, Petros Zimourtopoulos |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
| "Bill Miller" wrote in message
| ... | | wrote in message | ... || From......: "Bill Miller" || Newsgroups: sci.physics.electromag || Sent......: Wednesday, August 18, 2010 10:44 PM || Subject...: vemsa3d 1.1 - a floss visual em simulator || for 3d antennas || || wrote in message ... || - || ... || || How does this work differ from NEC Numeric Electromagnetic || Code for antenna analysis? || || Bill Miller | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | | Dear Mr. Miller, | | VEMSA3D can not work differently, because it is based | on the same theoretical method as NEC does, that is on | the Method of Moments. | | However, since each of these numerical applications use | a different basis of the current function space and since | their corresponding computer programs use unavoidably | finite linear combinations of them, in general, they | produce different results. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | | Can you quantify further or explain the nature of thes | "different results?" | | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Well, I can try. These numerically different results are due to the different coupling -reaction, or impedance- between two current distributions for which different function -expression, type, formula, or equation- is used to describe them in each one of the two applications, VEMSA3D and NEC. 2 | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | | Are there certain classes of antennas for which VEMSA3D | might produce more accurate results than NEC? | | Thanks! | | Bill Miller | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - You are welcome! VEMSA3D is a thin-wire polygonal modeler in "free space". Therefore, it has to "exactly" predict or justify the characteristics of any thin-wire antenna. For this class of antennas VEMSA3D can be certainly compared with NEC. Anyhow, this comparison can only be indirect: you have to build and measure the specific thin-wire antenna first and then to overlay the results of both applications upon the measurements. But since this kind of knowledge is definitely a posteriori, you can try a comparison of both applications for *any* class of antennas. Here, only the advertisement builds knowledge a priori; but usually this is followed by a deep disillusionment. Regards, Petros Zimourtopoulos |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
| "John Smith" wrote in message
| ... | On 8/19/2010 10:32 AM, wrote: || From......: "Bill || Newsgroups: sci.physics.electromag || Sent......: Wednesday, August 18, 2010 10:44 PM || Subject...: vemsa3d 1.1 - a floss visual em simulator || for 3d antennas || || wrote in message ... || - || ... || || How does this work differ from NEC Numeric Electromagnetic Code for antenna || analysis? || || Bill Miller | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | | Dear Mr. Miller, | | VEMSA3D can not work differently, because it is based | on the same theoretical method as NEC does, that is on | the Method of Moments. | | However, since each of these numerical applications use | a different basis of the current function space and since | their corresponding computer programs use unavoidably | finite linear combinations of them, in general, they | produce different results. | | To be specific, the two bases details are included in the | following: | | VEMSA3D current basis: | J. H. Rischmond, Radiation and Scattering by Thin-Wire | Structues in the Complex Freqeuncy Domain, (15), p.6 | http://tinyurl.com/24zwycy | | NEC current basis: | G. J. Burke, A. G. Poggio | Numerical Electromagnetics Code - Method of Moments | Equation (20), p. 11 | http://www.si-list.net/NEC_Archives/nec2prt1.pdf | | Regards, | | Petros Zimourtopoulos - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | | I like how everyone ignores the elephant in the room, thought | I would keep quite, sit back and see if anyone noticed the | elephant stepping on their foot--case of numb feet I guess. | | So: What about MMANA-GAL. MMANA-GAL is about an exact | work-a-like as you can get to NEC. Is free, has no | limitations in software, etc. Are there any advantages to | your program? Accuracy? | | Regards, | JS | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Hello, again, JS! For MMANA-GAL, I just took a look at: http://mmhamsoft.amateur-radio.ca/pages/mmana-gal.php where you can also read that, according to its developers, this application is a descendant of MININEC, that is of NEC. Therefore, there is no need to add nothing more on what already written in some previous articles of this thread about VEMSA3D and NEC. Furthermore, I also just took a look at: http://dl2kq.de/promm/ where you can read too that its developers clearly exhibit its license and capabilities limitations. Therefore, there is also no need to add nothing more on what they already wrote -not to mention what it is lengthy said about software pattents and usage restrictions in this tread. Finally, the accuracy issue is also has been exhausted in yesterday article: | Sent......: Sunday, August 22, 2010 9:38 PM | Newsgroups: sci.physics.electromag,rec.radio.amateur.antenna | Subject...: vemsa3d 1.1 - a floss visual em simulator for | 3d antennas | From......: so I have also nothing to add. Well, after all, it seems that we only forgot to mention the name of that elephant in the room -perhpas because its advantageous name is /F/L/O/S/S/. Best regards, pez |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
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vemsa3d 1.1 - a floss visual em simulator for 3d antennas
| "John Smith" wrote in message
| ... | On 8/22/2010 11:55 PM, wrote: | | ... | Well, after all, it seems that we only forgot to mention the | name of that elephant in the room -perhpas because its | advantageous name is /F/L/O/S/S/. | | Best regards, | | pez - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | | Yes, the free, as in free beer is one great advantage, but an | advantage not all will be able to take advantage of. Since | MMANA-GAL and EZNEC have visual interfaces so similar, being | able to use one is effectively being able to immediately use | the other. The learning curve into your interface takes just | a bit longer ... but, as you say, the availability of the | source makes it highly desirable to at least one group. | | Thanks for the swift reply, | JS | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - You're very welcome! But please take into account that our software is not free, as in free beer or free gratis; is free, as in liberty, in free speech or free libre*. Therefore, we don't support license brokers, promote illegal code use or propagandize software piracy. Thank you very much for the chances you gave me to clearly express our group point of view! Kind regards, pez * Gratis versus Lib http://en.wikipedia.org/wiki/Gratis_versus_Libre |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
On Mon, 23 Aug 2010 10:13:33 -0700, John Smith
wrote: On 8/22/2010 11:55 PM, wrote: ... Well, after all, it seems that we only forgot to mention the name of that elephant in the room -perhpas because its advantageous name is /F/L/O/S/S/. Best regards, pez Yes, the free, as in free beer is one great advantage, but an advantage not all will be able to take advantage of. If you're saying free isn't really free I can agree with you. I have brewed my own beer (still do) and the realization was quickly discovered that free isn't really free unless the hourly rate is zip, zero, nada.... Paying consultants a kilobuck per day to support FOSS-based projects starts looking pound-foolish very quickly. Training the in-house guy to learn the ins and outs of a piece of FOSS doesn't work too well either. If the guy is any good, he will soon be marketing his skills as a $100+/hr consultant. In this aspect FOSS is just another form vendor lock-in except the vendor is the consultant hawking his skills and knowledge. Since MMANA-GAL and EZNEC have visual interfaces so similar, being able to use one is effectively being able to immediately use the other. The learning curve into your interface takes just a bit longer ... Both provide immediate understanding but one immediacy takes longer than the other? How different are skillsets for using a WIMP interface? but, as you say, the availability of the source makes it highly desirable to at least one group. The free in FOSS doesn't mean that anything is free of a learning curve. In fact FOSS can actually present a learning wall. P2P support tends to deal with solving specific problems rather than any abstract interpretation of what the problem is, why it exists (aka why the tool works as it does), and how best to resolve the specific issue. The biggest problem with FOSS is too many freetards try to use the tools and fail to contribute what they have learned/experienced into any sort of public knowledge base. I don't mean to denigrate FOSS at all. I'm just asking if FOSS is _the_ answer what was _the_ question? Too many know-nothings assume the tool is the answer and free means minimal effort/expense required. Only knowledgeable consumers ask how expensive is free. |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
wrote in message ... | "John Smith" wrote in message | ... | On 8/22/2010 11:55 PM, wrote: | | ... | Well, after all, it seems that we only forgot to mention the | name of that elephant in the room -perhpas because its | advantageous name is /F/L/O/S/S/. | | Best regards, | | pez - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | | Yes, the free, as in free beer is one great advantage, but an | advantage not all will be able to take advantage of. Since | MMANA-GAL and EZNEC have visual interfaces so similar, being | able to use one is effectively being able to immediately use | the other. The learning curve into your interface takes just | a bit longer ... but, as you say, the availability of the | source makes it highly desirable to at least one group. | | Thanks for the swift reply, | JS | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - You're very welcome! But please take into account that our software is not free, as in free beer or free gratis; is free, as in liberty, in free speech or free libre*. Therefore, we don't support license brokers, promote illegal code use or propagandize software piracy. Thank you very much for the chances you gave me to clearly express our group point of view! Kind regards, pez * Gratis versus Lib http://en.wikipedia.org/wiki/Gratis_versus_Libre FYI I'll be posting information and links on your software on antenneX.com's user group. Antennex.com is, perhaps, the largest and most diverse website devoted exclusively to antennas and related items. The website has both free (no charge) and fee (charge for subscription) sections. The user group is no charge and there are particiapnts from close to 100 countries with skill levels from enthusiastic amateur to world recognized experts. Bill |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
On 8/23/2010 12:42 PM, wrote:
... You're very welcome! But please take into account that our software is not free, as in free beer or free gratis; is free, as in liberty, in free speech or free libre*. Therefore, we don't support license brokers, promote illegal code use or propagandize software piracy. Thank you very much for the chances you gave me to clearly express our group point of view! Kind regards, pez * Gratis versus Lib http://en.wikipedia.org/wiki/Gratis_versus_Libre Well, as you have seen, a concept such as "free" can mean many things to many different people, splitting hairs on that is only a waste of time some can engage in here ... However, I have downloaded the source, in C++, and have been making notes and stub testing various parts. One aspect of the source which really strikes me in the face, it is un-commented! Ya' just gotta luv that software engineer! ROFLOL Regards, JS |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
Please, note that I experimentally confirmed -once again- that
NASA does not infinitely support direct linking to its Technical Reports Server (NTRS) contents. Therefore, the link given in article: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | Sent......: Thursday, August 19, 2010 7:32 PM | Newsgroups: sci.physics.electromag,rec.radio.amateur.antenna | Subject...: vemsa3d 1.1 - a floss visual em simulator for | 3d antennas | From......: | | ... | J. H. Richmond, Radiation and Scattering by Thin-Wire | Structures in the Complex Frequency Domain, (15), p.6 | http://tinyurl.com/24zwycy | ... - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - is not a valid one anymore. One has to firstly connect to NTRS: http://ntrs.nasa.gov/search.jsp and search for: "Radiation and scattering by thin-wire structures in the complex frequency domain" or some adequate part of it, e.g. like the following one, which it seems that currently holds: "Radiation and scattering by thin-wire" to get the Richmond's report item first and after two more steps the full-text through "View PDF File". Petros Zimourtopoulos |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
| "John Smith" wrote in message
| ... | On 8/23/2010 12:42 PM, wrote: | | ... | | Well, as you have seen, a concept such as "free" can mean | many things to many different people, splitting hairs on that | is only a waste of time some can engage in here ... | However, I have downloaded the source, in C++, and have been | making notes and stub testing various parts. One aspect of | the source which really strikes me in the face, it is | un-commented! Ya' just gotta luv that software engineer! | ROFLOL | | Regards, | JS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Dear JS, Thank you for pointed out this issue too! As I already said, VEMSA3D is open source code, which is distributed as free-libre; not free-gratis. Therefore, we keep the right to publish full-comments about our source code sometime in the future, as everybody else of course. Please, see GNU GPL 3.0: http://www.gnu.org/licenses/gpl.html Free-gratis is the MS Windows application VEMSA3D, which *everyone* can enjoy the production of it by simply following the fully-commented instructions we already gave at the third page, right column, of our paper: http://arxiv.org/abs/1006.0031 Best regards, pez, SV7BAX |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| From......: "Bill Miller" | Newsgroups: rec.radio.amateur.antenna,sci.physics.electromag | Sent......: Tuesday, August 24, 2010 1:00 AM | Subject...: vemsa3d 1.1 - a floss visual em simulator | ..........: for 3d antennas - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | wrote in message ... || "John Smith" wrote in message || ... || On 8/22/2010 11:55 PM, wrote: || || ... || Well, after all, it seems that we only forgot to mention the || name of that elephant in the room -perhpas because its || advantageous name is /F/L/O/S/S/. || || Best regards, || || pez | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | | | | Yes, the free, as in free beer is one great advantage, but an | | advantage not all will be able to take advantage of. Since | | MMANA-GAL and EZNEC have visual interfaces so similar, being | | able to use one is effectively being able to immediately use | | the other. The learning curve into your interface takes just | | a bit longer ... but, as you say, the availability of the | | source makes it highly desirable to at least one group. | | | | Thanks for the swift reply, | | JS | | | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | | You're very welcome! | | But please take into account that our software is not free, | as in free beer or free gratis; is free, as in liberty, in | free speech or free libre*. Therefore, we don't support | license brokers, promote illegal code use or propagandize | software piracy. | | Thank you very much for the chances you gave me to clearly | express our group point of view! | | Kind regards, | | pez | |* Gratis versus Lib | http://en.wikipedia.org/wiki/Gratis_versus_Libre | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | | FYI I'll be posting information and links on your software on | antenneX.com's user group. | | Antennex.com is, perhaps, the largest and most diverse | website devoted exclusively to antennas and related items. | The website has both free (no charge) and fee (charge for | subscription) sections. | | The user group is no charge and there are particiapnts from | close to 100 countries with skill levels from enthusiastic | amateur to world recognized experts. | | Bill | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Thank you very much, Bill, I really appreciate your offer. Please try to do so -if you are an unmoderated user of the magazine list, of course- since our accounts to magazine e-list are about to expire, while, after 7 years or so, our group members' subscriptions to the magazine, have been recently expired -the last one today: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | Sent...: Tuesday, August 24, 2010 7:03 AM | Subject: Your antenneX Paid Subscription Account has Expired | From...: antenneX Online Magazine listmgr-at-antennex.com | To.....: Petros Zimourtopoulos ...-at-antennas.gr - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Petros |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
Petros ... I posted some information on your VEMSA3D on Antennex's discussion group, but your email bounced. May I have a correct email for you, please? PM me if you'd like. Bill Miller kt4yeatyahoo.com |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
On 8/24/2010 1:05 AM, wrote:
... Dear JS, Thank you for pointed out this issue too! As I already said, VEMSA3D is open source code, which is distributed as free-libre; not free-gratis. Therefore, we keep the right to publish full-comments about our source code sometime in the future, as everybody else of course. Please, see GNU GPL 3.0: http://www.gnu.org/licenses/gpl.html Free-gratis is the MS Windows application VEMSA3D, which *everyone* can enjoy the production of it by simply following the fully-commented instructions we already gave at the third page, right column, of our paper: http://arxiv.org/abs/1006.0031 Best regards, pez, SV7BAX Again, I would never look a gift horse in the mouth ... I don't find the lack of comments an surmountable problem. If you have a basic understanding of the concepts which a piece of software source deals with, it is relatively easy to locate them and comment/document them yourself. For example, when looking in software for routines and statements dealing with a circle, you would simple search for constructs dealing with area, circumference, diameter, etc. It is just a logical progression to look for those dealing with the implementation of the moment method. NEC source used in conjunction with these efforts makes it a tolerable exercise in reverse engineering the task ... I see nothing wrong with expecting someone to do a bit of work to get something for "free", LOL. Regards, JS |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
| "Bill Miller" wrote in message
| ... | | Petros ... | | I posted some information on your VEMSA3D on Antennex's | discussion group, but your email bounced. May I have a correct | email for you, please? PM me if you'd like. | | Bill Miller | kt4yeatyahoo.com - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Bill, Yes, indeed! I just saw your appreciative message for vemsa3d along with the comments of other [Antenna-discussion] list members, just a little before, when I unsubscribed from that list: - | Sent...: Wednesday, August 25, 2010 8:43 AM | Subject: You have been unsubscribed from the Antenna-discussion | : mailing list | To.....: ...-at-gmail.com | From...: | | Thanks for your stay with us! | | Regards, Listmgr - as well as of that one founded by ever memorable Cebik: - | Sent...: Wednesday, August 25, 2010 8:50 AM | Subject: You have been unsubscribed from the Cebiksite | mailing list | To.....: ...-at-gmail.com | From...: cebiksite-bounces-at-cebik.com - As of this email address, unfortunately, I have to use it in USENET against e-mail robot-reapers. I already sent you this e-mail from my real e-mail address too. Thank you very much, Petros Zimourtopoulos |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
| wrote in message ...
| ... | Free-gratis is the MS Windows application VEMSA3D, which | *everyone* can enjoy the production of it by simply following | the fully-commented instructions we already gave at the third | page, right column, of our paper: | http://arxiv.org/abs/1006.0031 | ... - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - A clarification is needed he This is version 1.0 info, which has to be seen in parallell with that of file [install.txt] included in version 1.1 zip at: http://code.google.com/p/rga/downloads/list pez, SV7BAX |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
| "John Smith" wrote in message
| ... | ... | Again, I would never look a gift horse in the mouth ... I don't | find the lack of comments an surmountable problem. If you have | a basic understanding of the concepts which a piece of software | source deals with, it is relatively easy to locate them and | comment/document them yourself. For example, when looking in | software for routines and statements dealing with a circle, you | would simple search for constructs dealing with area, | circumference, diameter, etc. It is just a logical progression | to look for those dealing with the implementation of the | moment method. NEC source used in conjunction with these | efforts makes it a tolerable exercise in reverse engineering | the task ... | | I see nothing wrong with expecting someone to do a bit of work | to get something for "free", LOL. | | Regards, | JS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - That's right! Since -as you already said- there are various aspects of "free". Therefore, there is no field of application of term 'reverse engineering' especially under the licenses 'Free Libre Source Code' and 'Public Domain Source Code', since there is nothing there to disassembly it. Moreover, under these licenses, ethics impose to give in return at least as much as you get. This is especially holds in VEMSA3D case, in which we get the Source Code included in J.H.Richmond's report: "Computer program for thin-wire structures in a homogeneous conducting medium" or just "Computer program for thin-wire structures" from NASA Technical Reports Server at: http://ntrs.nasa.gov/search.jsp in the way already described in message: | Sent......: Tuesday, August 24, 2010 8:59 AM | Subject...: vemsa3d 1.1 - a floss visual em simulator | : for 3d antennas | Newsgroups: sci.physics.electromag,rec.radio.amateur.antenna | From......: Well, this source code has 1,044 lines of code, in 16 routines: (1,044 = 100 + 61 + 158 + 36 + 9 + 98 + 120 + 104 + 40 + 64 + + 45 + 22 + 22 + 40 + 87 + 38) and in return, we give for now: * only 3 comment lines less than * those exist among these 1,044 lines -as one can easily find them in SGANT routine, at page 22, of the aforementioned report. Best regards, pez, SV7BAX |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
On 8/25/2010 2:18 AM, wrote:
... That's right! Since -as you already said- there are various aspects of "free". Therefore, there is no field of application of term 'reverse engineering' especially under the licenses 'Free Libre Source Code' and 'Public Domain Source Code', since there is nothing there to disassembly it. Moreover, under these licenses, ethics impose to give in return at least as much as you get. This is especially holds in VEMSA3D case, in which we get the Source Code included in J.H.Richmond's report: "Computer program for thin-wire structures in a homogeneous conducting medium" or just "Computer program for thin-wire structures" from NASA Technical Reports Server at: http://ntrs.nasa.gov/search.jsp in the way already described in message: Best regards, ... pez, SV7BAX Yes. Well, "reverse engineering", apparently, has many different meanings to many different people, as "free", also. However, all reverse engineering, done by engineers, does not involve a disassembler. Physical devices and concepts lend themselves well to reverse engineering, also. I certainly have no interests in implementing any of this in a business/financial interest. And, since amateur radio itself demands the concept of "giving back"; It is a well known tradition. I see no conflicts with my directions, uses and interests. NASA's contribution has already been paid for. NASA is the beneficiary of public funds ... I am sure the taxpayers say, "Thank you NASA;" I know I do. Regards, JS |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
wrote:
Please, note that I experimentally confirmed -once again- that NASA does not infinitely support direct linking to its Technical Reports Server (NTRS) contents. Therefore, the link given in article: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | Sent......: Thursday, August 19, 2010 7:32 PM | Newsgroups: sci.physics.electromag,rec.radio.amateur.antenna | Subject...: vemsa3d 1.1 - a floss visual em simulator for | 3d antennas | From......: | | ... | J. H. Richmond, Radiation and Scattering by Thin-Wire | Structures in the Complex Frequency Domain, (15), p.6 | http://tinyurl.com/24zwycy | ... - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - is not a valid one anymore. One has to firstly connect to NTRS: http://ntrs.nasa.gov/search.jsp I think the tinyurl got screwed up.. the url it maps to is a search request, not the actual direct link to the document. (http://ntrs.nasa.gov/search.jsp?R=87...false&or=true&... qs=Ntt%3DRadiation%2Band%2Bscattering%2Bby%2Bthin-wire%2Bstructures%26... Ntk%3Dall%26Ntx%3Dmode%2Bmatchall%26Ns%3DHarvestDa te%257c1%26N%3D0) ' I would think that using the link by the the handle will remain fixed: http://hdl.handle.net/2060/19740013743 but it's always useful to keep track of the NASA document number (that won't change).. NASA-CR-2396 or TR-2902-10 and hopefully you can always search on that, if the handle dies for some reason. |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
| "Jim Lux" wrote in message
| ... | wrote: | Please, note that I experimentally confirmed -once again- that | NASA does not infinitely support direct linking to its | Technical Reports Server (NTRS) contents. Therefore, the link | given in article: | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - || Sent......: Thursday, August 19, 2010 7:32 PM || Newsgroups: sci.physics.electromag,rec.radio.amateur.antenna || Subject...: vemsa3d 1.1 - a floss visual em simulator for || 3d antennas || From......: || || ... || J. H. Richmond, Radiation and Scattering by Thin-Wire || Structures in the Complex Frequency Domain, (15), p.6 || http://tinyurl.com/24zwycy || ... | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | is not a valid one anymore. One has to firstly connect to | NTRS: | http://ntrs.nasa.gov/search.jsp | | | I think the tinyurl got screwed up.. the url it maps to is a search | request, not the actual direct link to the document. | (http://ntrs.nasa.gov/search.jsp?R=87...false&or=true&... | qs=Ntt%3DRadiation%2Band%2Bscattering%2Bby%2Bthin-wire%2Bstructures%26... | Ntk%3Dall%26Ntx%3Dmode%2Bmatchall%26Ns%3DHarvestDa te%257c1%26N%3D0) | | ' | I would think that using the link by the the handle will remain fixed: | http://hdl.handle.net/2060/19740013743 | | but it's always useful to keep track of the NASA document number (that | won't change).. NASA-CR-2396 or TR-2902-10 and hopefully you can always | search on that, if the handle dies for some reason. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Thank you very much to correct me on this issue! I did know the DocID existence but I did not realise, until now, how it can be proved helpful. From the URL you gave us for Richmond's report: | http://hdl.handle.net/2060/19740013743 I found that 'hdl.handle.net' is a 'Handle Server', and from NTRS item for this paper, I see that 19740013743 is its DocID. In this way, and by experimentally replacing this DOcID with '19890004330', I got the report titled "Radiation and scattering ...". May now I think that '2060' is some kind of ID in this Handle System for NTRS? Where can I find more such IDs? Would you please advise me more on this interesting subject? |
vemsa3d 1.1 - a floss visual em simulator for 3d antennas
| wrote in message ...
|| "Jim Lux" wrote in message || ... || ... || I think the tinyurl got screwed up.. the url it maps to is a search || request, not the actual direct link to the document. || (http://ntrs.nasa.gov/search.jsp?R=87...false&or=true&... || qs=Ntt%3DRadiation%2Band%2Bscattering%2Bby%2Bthin-wire%2Bstructures%26... || Ntk%3Dall%26Ntx%3Dmode%2Bmatchall%26Ns%3DHarvestDa te%257c1%26N%3D0) || || ' || I would think that using the link by the the handle will remain fixed: || http://hdl.handle.net/2060/19740013743 || || but it's always useful to keep track of the NASA document number (that || won't change).. NASA-CR-2396 or TR-2902-10 and hopefully you can always || search on that, if the handle dies for some reason. | | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | | Thank you very much to correct me on this issue! | | I did know the DocID existence but I did not realise, | until now, how it can be proved helpful. From the URL | you gave us for Richmond's report: | || http://hdl.handle.net/2060/19740013743 | | I found that 'hdl.handle.net' is a 'Handle Server', and | from NTRS item for this paper, I see that 19740013743 is | its DocID. In this way, and by experimentally replacing | this DOcID with '19890004330', I got the report titled | "Radiation and scattering ...". May now I think that | '2060' is some kind of ID in this Handle System for NTRS? | Where can I find more such IDs? Would you please advise me | more on this interesting subject? It seems that this is a somehow complicated matter... Well, there is a basic FAQ he http://www.handle.net/faq.html http://www.handle.net/overviews/handle-syntax.html where I found that in the referenced by Jim Lux: | http://hdl.handle.net/2060/19740013743 or in: http://dx.doi.org/2060/19740013743 the couple of numbers '2060/19740013743' forms indeed a unique 'handle' of which the two parts (numbers) are known as: Handle Prefix/Handle Suffix or as 'unique naming authority' / 'unique local name under this naming authority'. Anyway, after I found 'The Internet Engineering Task Force (IETF)', of which: 'The goal of the IETF is to make the Internet work better': http://www.ietf.org/ it made clearer that there is a registration procedure of 'naming authorities', as well as and this is definitely a work which currently in progress, since on July 12, 2010, the registered Name Assigning Authority Numbers (NAAN) are only 54: http://www.cdlib.org/services/uc3/naan_table.html while among of them there is no NAAN for NASA or NTRS. Anyway, this is really a very helpful reference system for the Internet, but only *after* someone have search and find the document which looked for, along with its unique handle, of course. Once again, thank you very much Mr. Lux for pointing out this very interesting issue! |
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