Search found 5579 matches

by Amber G.
13 Jan 2019 22:53
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

Waited for this update for a long time. After a successful final round of meetings with the State Environmental Impact Assessment Authority on Jan 8th. LIGOIndia formally transits into the construction phase. Team celebrations on Jan 17th at Khandala. (Some information here: http://www.gw.iucaa.in/l...
by Amber G.
12 Jan 2019 03:02
Forum: Technology & Economic Forum
Topic: BR Maths Corner-1
Replies: 1737
Views: 83470

Re: BR Maths Corner-1

Speaking of Ramanujan, here is a problem to test interest and resourcefulness of BRF junta in 2019. The problem is old but see if you can do it -- first without external help but later go ahead use computers, internet, ask/phone a friend/expert . See how long it takes to get a answer in this dhaga. ...
by Amber G.
12 Jan 2019 02:59
Forum: Technology & Economic Forum
Topic: BR Maths Corner-1
Replies: 1737
Views: 83470

Re: BR Maths Corner-1

Speaking of 2019 - (From mine and few of my friends social media) Ramanujan would notice that: 2019 = 1^4+2^4+3^4+5^4+6^4 *** 2019^(2^(9-1-0-2))-2018 is prime. If you add all the digits (of the above 213 digit prime number) the number is also prime. This number (sum of digits of the huge prime numbe...
by Amber G.
12 Jan 2019 02:53
Forum: Technology & Economic Forum
Topic: BR Maths Corner-1
Replies: 1737
Views: 83470

Re: BR Maths Corner-1

For the New Year we have a new Mersenne prime M₈₂ ₅₈₉ ₉₃₃=2⁸² ⁵⁸⁹ ⁹³³ - 1. It has 24,862,048 digits making it the largest known prime. By the Euler-Euclid theorem, we get a new even perfect number 2⁸² ⁵⁸⁹ ⁹³²(2⁸² ⁵⁸⁹ ⁹³³ - 1) . It was discovered via the Great Internet Mersenne Prime Search (GIMPS) b...
by Amber G.
11 Jan 2019 22:03
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

Some may be interested (share if you know some one who may be) LIGO-IndIGO is going to run a Summer Students Program: 10-week research program. It is in summer 2019 and one can apply till Fen 2019. The program encourages undergraduate students (Mostly from good Indian Colleges) to participate in th...
by Amber G.
30 Dec 2018 10:49
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

A few technical comments regarding my old post : Please see https://forums.bharat-rakshak.com/viewtopic.php?p=2311525#p2311525 for background. Okay people may have done their own calculations, but here are a few comments which may be helpful: - The advantages/disadvantages for the launch point close...
by Amber G.
30 Dec 2018 10:04
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

What is the point in concentrating all your space assets in a specific region? Agree that is God's own country, but it is not sooo special that other regions and states have to be overlooked. In fact other regions may offer better "everything"! Honestly IMO, Kerala lost any chance to majo...
by Amber G.
25 Dec 2018 10:04
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

Here is one nice picture which makes a few things clear to visualize. (I took the picture from a blog from planetary dot org) http://planetary.s3.amazonaws.com/assets/images/z_changeover/20130125_vandenberg-launch-trajectories_f537.png The Launch site is Vandenberg Air Force base in California. (Lat...
by Amber G.
25 Dec 2018 09:38
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

^^^ Thanks. And where is site in Gujarat suggested. For Kulasekharapatnam looking at the map it looks like azimuth 40 degrees on both sides of south direction is available for launch. This means that any inclination inclination of 50 degrees or higher (both for retrograde or prograde orbits) can be ...
by Amber G.
25 Dec 2018 08:23
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

Kukashekaraptnam is being planned for other polar launches. The Gujarat site is planned for primarily SSLV launches Where is this site (Latitude/Longitude) ? (I can't seem to locate the site on google map) (What is the range of possible Launch azimuth angles here? (Range of directions where where n...
by Amber G.
25 Dec 2018 04:00
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

Interesting that Gujarat has come up and not say, Kulasekharapattinam that has been in news as possible second location. I read somewhere (and the physics of it still escapes me ) that polar launches are more efficient from high latitudes. There was some discussion and interest so I put a message a...
by Amber G.
24 Dec 2018 23:45
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

To add a few more points for those who are interested in GST Basics: As I said here Basically: 1. Time period of Geostationary (or Geosynchronous orbit) is about 24 hours -- actually 23 Hours 56 minute == time it takes earth to spin around its axis. 2. Geostationary orbit is circle with 0 inclinatio...
by Amber G.
24 Dec 2018 11:12
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

<snip> • Apogee (Farthest point from Earth) x Perigee (Nearest point from earth): 38,905 km x 11,693 km • Inclination: 5.75 deg • Orbital period: 15.59 hours 15.59 hours? Wasn't this supposed to be super synchronous orbit. As I said here Basically: 1. Time period of Geostationary (or Geosynchronous...
by Amber G.
15 Dec 2018 23:15
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

I first came to know about superconductivity in 11th Standard. I immediately got convinced that advent of superconductors working at room temperatures under normal conditions would be a paradigm changing technology. It would seat with the likes of Fire, wheel, iron, semi cpnductprs and so on. I hop...
by Amber G.
15 Dec 2018 06:39
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

This looks like a BIG really BIG item...and indications are that this is real. The news just got a big credibility boost -- There is a paper, accepted in prestigious Physical Review Letters and hence this is may be a potential record-breaking superconductor. Expect major headlines in coming days..It...
by Amber G.
13 Dec 2018 04:56
Forum: Technology & Economic Forum
Topic: BR Maths Corner-1
Replies: 1737
Views: 83470

Re: BR Maths Corner-1

And this post too .. http://en.wikipedia.org/wiki/1_+_2_+_3_+_4_+_%E2%80%A6 If I am not mistaken, such things were already considered by Euler. Not really. It is true that Euler was one of the first (or a giant) who studied these zeta functions (Many still call them Euler-Riemann-zeta functions) ( E...
by Amber G.
13 Dec 2018 04:33
Forum: Technology & Economic Forum
Topic: BR Maths Corner-1
Replies: 1737
Views: 83470

Re: BR Maths Corner-1

My earlier posts from a few years ago reposted here: ...This also has been mentioned a few times in this dhaga.. in fact the sum of 1/n^2.., that is S=1+1/4+1/9+1/16+1/25 ... is some times not covered in many undergraduate math courses... The sum, of course is, (pi^2/6), This is what fascinated my s...
by Amber G.
13 Dec 2018 04:25
Forum: Technology & Economic Forum
Topic: BR Maths Corner-1
Replies: 1737
Views: 83470

Re: BR Maths Corner-1

^^^ note **1 from above.. One of "interesting" fact which has fascinated lot of people is: zeta function when s=0 or negative number -- If one does "analytical continuation" makes sense and one finds: ζ(0) = -1/2 ζ(1) = -1/12 These makes NO sense if one just uses series method. f...
by Amber G.
13 Dec 2018 04:00
Forum: Technology & Economic Forum
Topic: BR Maths Corner-1
Replies: 1737
Views: 83470

Re: BR Maths Corner-1

<<<.... about HLF Blogs: What is the Riemann Hypothesis? ---- Perhaps we will take this to BRF math dhaaga. we have couple or profs there calling gurus to explain what benefits the world on solving this? Few comments: - We have discussed the Riemann Hypothesis here in BRF at a few times. Some reall...
by Amber G.
12 Dec 2018 04:57
Forum: Strategic Issues & International Relations Forum
Topic: India Nuclear News and Discussion 4 July 2011
Replies: 4300
Views: 184503

Re: India Nuclear News and Discussion 4 July 2011

^^^ Just to add: (Noteworthy): - This record (941 days) is for *any* kind of reactor. Kaiga Broke the record for PHWR type a few months ago. - Both PHWRs and AGRs are designed to be refuelled without being shut down. Three of India's reactors - Kaiga 1, which is still in operation, Rajasthan unit 3 ...
by Amber G.
11 Dec 2018 08:28
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

Slightly OT but there is some interesting recent news about something which we discussed in this thread recently. (NASA’s Voyager 2 spacecraft has crossed into interstellar space, agency officials announced today.) https://www.scientificamerican.com/article/voyager-2-spacecraft-enters-interstellar-s...
by Amber G.
11 Dec 2018 07:54
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

Last year Rai Weiss, Kip Thorne and Barry Barish were awarded the NobelPrize for their contributions to our gravitational-wave science. If you want you can watch their #NobelPrize lectures here:

https://www.youtube.com/watch?v=scVyxVnMYUc
by Amber G.
08 Dec 2018 05:56
Forum: Technology & Economic Forum
Topic: Renewable Sources of Energy
Replies: 314
Views: 31790

Re: Renewable Sources of Energy

^^^ From above article --- ..The researchers estimate that such a system would be vastly more affordable than lithium-ion batteries, which have been proposed as a viable, though expensive, method to store renewable energy. They also estimate that the system would cost about half as much as pumped hy...
by Amber G.
08 Dec 2018 01:22
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

^I Worked on NIR based non-invasive glucose concentration measurement device. Work hit the wall when it turned out that source had to be very bright and the receiver sensitive enough to do anything meaningful. RF-based device was promising but our project guide asked us to switch to biomed-image en...
by Amber G.
07 Dec 2018 05:38
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

^^^From what I saw from the press briefing that the Geosynchronous Transfer Orbit((elliptical ) was as close to perfect as they hoped. Rest of the orbit maneuver(s) takes place in next couple of days which is not really a critical part The satellite will remain in that way for years so no need to hu...
by Amber G.
07 Dec 2018 02:21
Forum: Technology & Economic Forum
Topic: Renewable Sources of Energy
Replies: 314
Views: 31790

Re: Renewable Sources of Energy

Yes .. similar.. more, if interested is this todays article from MIT's technology review.. (There is one article published today in Journal Energy and Environmental Science for technical details). “Sun in a box” would store renewable energy for the grid (I don't know if subscription is required so p...
by Amber G.
07 Dec 2018 01:54
Forum: Technology & Economic Forum
Topic: Renewable Sources of Energy
Replies: 314
Views: 31790

Re: Renewable Sources of Energy

Recent news from MIT engineers show a very promising design for storing energy. This, they say is cheaper than pumped water or rechargeable batteries. This is to store energy from solar (or wind) and use it when it is not available (eg in night or low wind condition). They gave it a name "sun t...
by Amber G.
05 Dec 2018 21:49
Forum: Military Issues & History Forum
Topic: India's R&D in Defence DRDO, PSUs and Private Sector
Replies: 3433
Views: 355994

Re: India's R&D in Defence DRDO, PSUs and Private Sector

This, IMO, is BIG and great. I have also seen it in news reports so can be shared in open forum. Our scientists and defence has developed a cutting-edge materials which is RADAR *and* Infrared absorbing. Will keep soldiers "invisible" and safe. This is, as far as I know, first of its kind...
by Amber G.
05 Dec 2018 21:46
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

From a physics professor, but this has a great implication to India. Congratulations. Researchers from IIT Kanpur have developed cutting-edge metamaterials that will be of great importance in developing our country’s defence capabilities . Profs. Anantha Ramakrishnan, Department of Physics; J Ramku...
by Amber G.
04 Dec 2018 10:30
Forum: Military Issues & History Forum
Topic: India's R&D in Defence DRDO, PSUs and Private Sector
Replies: 3433
Views: 355994

Re: India's R&D in Defence DRDO, PSUs and Private Sector

Recent tweet https://twitter.com/IITKanpur/status/1069574911629250560 IT Kanpur ‏@IITKanpur 16h16 hours ago More Researchers at IITK have developed textile-based metamaterials for radar absorption that can be used as uniforms for personnel & skirtings or coverings for ground vehicles.Transparent...
by Amber G.
04 Dec 2018 09:40
Forum: Military Issues & History Forum
Topic: India's R&D in Defence DRDO, PSUs and Private Sector
Replies: 3433
Views: 355994

Re: India's R&D in Defence DRDO, PSUs and Private Sector

AmberG, the report indicates two different metamaterials. Are you sure its one itself? Yes, (there are two different materials). The same (at least the leadership) group of scientists have developed both One was done some time ago. Part which I think is cool that these material are flexible/cloth l...
by Amber G.
04 Dec 2018 09:35
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

Some may be interested (share if you know some one who may be) LIGO-IndIGO is going to run a Summer Students Program: 10-week research program. It is in summer 2019 and one can apply till Fen 2019. The program encourages undergraduate students (Mostly from good Indian Colleges) to participate in the...
by Amber G.
04 Dec 2018 09:03
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

Here is all 10 of our Binary Black Holes, (with time-frequency plots on the left (in the characteristic "chirp" shape) and reconstructed signal waveforms on the right.) from: O2Catalog (#chirpforLIGO)
Image
by Amber G.
04 Dec 2018 08:55
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

^^^ Except one all others (10) are blackhole mergers. One is the well known neutron star merger which has been confirmed in virtually all the wavelengths of EM waves too. .. Here are the details of the 10 events; https://www.ligo.caltech.edu/system/news_items/images/83/slide_large_image/GWTC-1-masse...
by Amber G.
04 Dec 2018 01:36
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

Meanwhile .. Wow! but this is going to be routine in coming times.. Waiting for LIGO India (a few years) to join.. Physicists Spot Four Black Hole Collisions, Including the Largest One Ever Recorded https://i.kinja-img.com/gawker-media/image/upload/s--79BvHTYu--/c_scale,f_auto,fl_progressive,q_80,w_...
by Amber G.
03 Dec 2018 23:21
Forum: Military Issues & History Forum
Topic: Indian Space Program: News & Discussion - Sept 2016
Replies: 3502
Views: 651926

Re: Indian Space Program: News & Discussion - Sept 2016

Sorry Haridas. Its true. Hyperspectral imagimg has been uses for this previoysly and for mine detection and soil data Kindly tell me which EM wave freq band ( wavelenghth in said hypetspectral camera) can seep through 1 mm of overlaying solid? None ! So where will the camera get its photon ? Mine d...
by Amber G.
03 Dec 2018 08:43
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

Is the infrared material as good as claimed? Virtually undetectable by an IR camera is a difficult thing..... I did not google this but am curious as to whether this material has a low thermal conductivity, or high specific heat (or both). In effect they have made a good thermal insulator? Heat 'ab...
by Amber G.
03 Dec 2018 00:49
Forum: Technology & Economic Forum
Topic: Physics Discussion Thread
Replies: 2429
Views: 61151

Re: Physics Discussion Thread

^^^ From Neil Degrasse himself on FB:
On being Accused

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