Author Topic: And now for something Completely Different.  (Read 25106 times)

Offline Eben

Re: And now for something Completely Different.
« Reply #15 on: May 08, 2015, 12:04:00 AM »
OK, first the house, or in this case, an apartment block. The Chinese have mastered a new technique where they build the Hi-Rise on the ground and once it is finished, it is lifted up and placed on preformed driven piles. It is much easier to build and also much cheaper.



As you can see in the next photo, thay have completed a number of these buildings and are about to lift this one.




Here is a drawing of the final building on it's piles. Cool, well done.










Now for the instrument:


......the Chapman Stick...



http://youtu.be/dYKB6Lag-wg

Or more funky.....

http://youtu.be/2rLsSfd67qE



Thanks deonk2000. This is what it looks like





And someone playing it




Here is Mr. Chapmen himself explaining it

https://www.youtube.com/watch?v=PvuiAobq2_Y


If you think this is nuts, check out these guys...







http://www.harpguitars.net/players/players-sightings.htm


Offline joel

Re: And now for something Completely Different.
« Reply #16 on: May 08, 2015, 09:11:33 AM »
I knew nothing about this instrument so, thanks Achim. Could you elaborate on it, are there any in SA, etc.


There are at least two in SA and the Hang Drums sound exquisite.
Made -or at least they were made- by Panart, who have moved on to another evolution of the instrument.

One of the best exponents of the hang drum played at the vinyl faire at Thirteen a few weeks ago.
Most of the vinyl dealers didnt hear them as they had mostly packed up and gone home before the live music started. Perhaps the real thing isnt for them.

No Hang drums are commercially available and those that have them had to sign an agreement with Panart not to sell.


Contact us to book a demo. - Twitter

Offline Eben

Re: And now for something Completely Different.
« Reply #17 on: May 08, 2015, 11:36:55 PM »
I knew nothing about this instrument so, thanks Achim. Could you elaborate on it, are there any in SA, etc.


There are at least two in SA and the Hang Drums sound exquisite.
Made -or at least they were made- by Panart, who have moved on to another evolution of the instrument.

One of the best exponents of the hang drum played at the vinyl faire at Thirteen a few weeks ago.
Most of the vinyl dealers didnt hear them as they had mostly packed up and gone home before the live music started. Perhaps the real thing isnt for them.

No Hang drums are commercially available and those that have them had to sign an agreement with Panart not to sell.

Wow, I would have loved to hear these guys play, what a pity. I can just imagine handling and playing something like that.

Today no house..... back to animation. The A&V parts of AVForum will be combined.

Give the pictures a chance to download and do their thing.


This is us... all of us.




Absolutely dumbstruck...




Some love this     





And some don't..




Some prefer this...



But then this happens...







Actually we all love this...



























With minimum effort you can do this...
Click on pic.




Todays instrument... I will do that tomorrow.








Offline Eben

Re: And now for something Completely Different.
« Reply #18 on: May 11, 2015, 05:20:40 PM »
Ok, here is the instrument:

The heading for this contribution should be : 

How law can you go

A lot of the contributions so far in this thread were very much “tong in cheek”, talking a lot of rubbish and it was not always obvious what was fact and what was fiction. This contribution is all fact. In the following picture you can see a sub woofer (the electro-magnetic driver). There is no speaker cone, the soil (earth) is the cone. The yellow microphones (not B&W.... no that was the speakers that have yellow.. never mind) are called geophones but work exactly like microphones. As you may gather, the frequencies are low.









This is a geophysical test done to investigate the “acoustic properties” of the underlying soil. Just like you would use a test tune and microphone to judge the acoustics of your room. From the geophones you can gather the progression of the Rayleigh waves (like the concentric waves in a pond when you throw a pebble in the water) which will give you the frequency and phase (or arrival time) as it travels through the soil. Through a process of mathematical de-convolution you can back-figure the subsoil geometry and properties. What soil layers are there, how thick and how compressible are they so you can do your design.

In the next pic is of one of my students, a crazy Frenchman (Benjamin) sitting on the actuator to get better ground penetration (this is next to the coal line to Richards Bay).



This is the same kid contemplating his sins....





So, we have bass junkies on this forum that will want to know.... how low can you go.  The lower the frequency the actuator can go the heavier it needs to be and the deeper the ground penetration will be. Really big speakers.

Next pic. The electro-magnetic shakers are only effective to about 16 to 20Hz, to get lower we revert to purely mechanical actuators, or shakers. This is one that we developed and can go down to 8 to 10 Hz.






Then there is the big one.
This was developed (among others) by Prof. Ken Stoke from the USA.
It is a 30 ton truck with a set of hydraulic pistons that shakes it (the entire truck in the air, off its wheels) in a perfect sin wave and penetrates a kilometer into the earth at less than 1Hz.





Here is the truck fully deployed and ready to shake. Notice the size of the geophones (grey cylinders next to the actuator on the ground) these will measure near field effects. The rest will be in an array radially spreading from the truck for a couple of kilometers.









« Last Edit: May 11, 2015, 05:25:22 PM by Eben »

Offline Eben

Re: And now for something Completely Different.
« Reply #19 on: May 13, 2015, 12:27:03 AM »
First the instrument

De Katzenklavier






Dont worry, creation of a sick mind, was never built. This is what almost happened to him.







What was the deal with the last post on geophysics.

Other than the obvious, we have some very similar toys, only some are bigger, what a cool truck.

It is the comparison of the two sciences, acoustics and geophysics that fascinates me. There are similarities, both are concerned with the propagation of waves within the laws of physics.

Seismics need to deal with 4 wave forms, two body waves (compression and shear waves) and two surface waves (Rayleigh and Love waves, not kidding), while acoustics are only concerned with compression waves. But the sciences aim to answer completely opposite questions.

In acoustics you know (or want to optimize) the geometry and properties of the room and you are concerned with predicting, modeling or measuring the resulting wave patterns and levels. In geophysics, you measure the wave response in the crust of the earth due to a known source and try to model the geometry and properties of the subsoil. End of lecture.

I realize that these posts are only of some interest or possibly just a giggle. I will keep some of it relevant and fresh if I can. 



This is what Love waves look like...











And here is an example of a surface wave....



Offline qwerty

Re: And now for something Completely Different.
« Reply #20 on: May 13, 2015, 10:28:55 AM »
Good stuff Eben, some welcome variation

Glad to see there are some engineers that also know how to use the right half of their brain   ;-)

Offline Eben

Re: And now for something Completely Different.
« Reply #21 on: May 13, 2015, 10:47:07 PM »
Good stuff Eben, some welcome variation

Glad to see there are some engineers that also know how to use the right half of their brain   ;-)

Thanks qwerty

Pleasure to offer some variation. Will start something new tomorrow.

Before I forget, here is an example of a Rayleigh wave (not kidding).







Offline Eben

Re: And now for something Completely Different.
« Reply #22 on: May 21, 2015, 07:42:01 PM »
How different and stupid can this thread get before it is no longer relevant or fun. Well, I think today’s contribution is going to come close....... music!!

This was prompted by another thread on “critical listening” where I introduced two world-renowned pianists.

http://www.avforums.co.za/index.php/topic,44134.msg567724.html#msg567724  .

One of the thoughts I had was, but they are so old, Brendel could have easily been my father and I am a grandfather. How many concert pianists can you name... and of these how many are young...What is the deal, is there a shortage of students and talent?

There are literally millions of the brightest young kids sacrificing everything to break into this league but very few make the big league, just like golf, soccer, etc. For this post, I want to blow your mind by introducing you to.... well see for yourself.

Benjamin Grosvenor age at 11:, he was born 8 July 1992 and started piano at the age of 10 and a year later at 11  he played in the BBC Young Musician of the Year piano final, ( i.e. under 18)  which he won. This is the final, he was not even a teenager:

The second piece on this clip is the Glinka-Balakirev's The Lark

https://www.youtube.com/watch?v=3FJeOaRjZaE

At the Proms 2011: Benjamin Grosvenor played a Cziffra's transcription of the Brahms Hungarian Dance No. 5. This was the First Night of the Proms at the Royal Albert Hall, London. The youngest ever in over a 100 years, he was only 19. Remember this is a transcript, so although you will recognize the piece, it is way different (improvised if you like by Cziffra and played by Benjamin)


https://www.youtube.com/watch?v=T79YWTc7HvU

Here is Sinfinimusic’s top 20 pianists, see who is at 20.

http://www.sinfinimusic.com/uk/features/guides/artist-guides/top-20-pianists

Not too shabby.
« Last Edit: May 21, 2015, 07:44:27 PM by Eben »

Offline adie

Re: And now for something Completely Different.
« Reply #23 on: May 21, 2015, 10:18:15 PM »
Bravo!  :clap:
Encore, Bis, Une Autre please Eben

Offline Eben

Re: And now for something Completely Different.
« Reply #24 on: May 22, 2015, 06:48:24 PM »
Bravo!  :clap:
Encore, Bis, Une Autre please Eben

OK. Lets flesh this out a bit. The lead up to my last and this post was a BBC Documentary: Imagine Being a Concert Pianist. It is self explanatory and worth a look if music is your thing. However, it is long (about an hour) so lets play around a bit and then come back to the BBC.

https://www.youtube.com/watch?v=Sl3Mtq99fio . Play this last



Lets listern to an example where the pianist playes the notes (+/-) with absolutely no interpretation. To be fair, she does not pretend to be a concert pianist, just someone’s sister. Here goes:

https://www.youtube.com/watch?v=j1fgo7hp-Ko


Now here is a concert pianist doing exactly the same thing.  Flight of the Bumble-Bee... it should sound like a bumble-bee and not like someone practicing scales.
 I think she is on speed/ecstasy or she has something else to do and just wants to get this over with:

https://www.youtube.com/watch?v=-yZPrrboTkY


This is what it should sound like. You can hear the bumblebee.

https://www.youtube.com/watch?v=EgtExoc_Zfk



Zimerman plays Chopin Ballade No. 1
One of the most emotional pieces on piano. There is something odd about this clip, not the music and I am not refering to his hair, see if you can spot it.

https://www.youtube.com/watch?v=RR7eUSFsn28


You might prefer Lang Lang, again Chopin Ballade No 1 in G Minor, Op 23

https://www.youtube.com/watch?v=Oju-e6sPvDw


This is probably the most memorable execution of this piece, from “The Pianist”

https://www.youtube.com/watch?v=TgBLraZlGww  Unfortunately just a portion of it.


and then lastly, you can make it up as you go, love it.....

https://www.youtube.com/watch?v=8snJ4zRhQ9g
« Last Edit: May 22, 2015, 06:50:53 PM by Eben »

Offline adie

Re: And now for something Completely Different.
« Reply #25 on: May 23, 2015, 10:48:29 PM »
Thanks again Eben. A couple of hours well spent.
How does Yuja Wang play that fast?  Maybe that performance was a (technically explosive) throwaway encore piece... and she certainly looked like she had somewhere else to be?

Zimmerman clip- wedding ring on right hand?

Offline Eben

Re: And now for something Completely Different.
« Reply #26 on: May 23, 2015, 11:17:20 PM »
Thanks again Eben. A couple of hours well spent.
How does Yuja Wang play that fast?  Maybe that performance was a (technically explosive) throwaway encore piece... and she certainly looked like she had somewhere else to be?

Zimmerman clip- wedding ring on right hand?

Zimmerman clip- No, not the ring. Here is a clue. Look carefully at 8:23 and then at 8:43...

https://www.youtube.com/watch?v=RR7eUSFsn28

how did he do that (it will probably take more than one take to get it).

Yuja Wang is actually very good and you guessed, it was in fact an encore to dazzle, she is not normally that careless and obviously technically unbelievable.

Offline adie

Re: And now for something Completely Different.
« Reply #27 on: May 23, 2015, 11:29:27 PM »
 :nfi: You got me. May be the wine...
 Initially I was listening more than watching-and moved on to Rubinstein's version.
I like Zimmerman's best (so far).

Offline Eben

Re: And now for something Completely Different.
« Reply #28 on: May 23, 2015, 11:47:15 PM »
:nfi: You got me. May be the wine...
 Initially I was listening more than watching-and moved on to Rubinstein's version.
I like Zimmerman's best (so far).

Agree, he is the best. Look at his chair...
« Last Edit: May 23, 2015, 11:51:04 PM by Eben »

Offline Steerpike

Re: And now for something Completely Different.
« Reply #29 on: May 24, 2015, 02:24:30 AM »
Fun with Sulphur Hexafluoride:

https://www.youtube.com/watch?v=u19QfJWI1oQ

If you have eye surgery, they will sometimes pump your eyeball up with this gas, until the body naturally replaces it with vitreous humour, after about 2 weeks.