Messages In This Digest (4 Messages)

1.: Minta tolong data histeresis magnet permanen From: Eric Johnson

2.: Van de Graaff generator and absurdities beginning in modern physics From: sorincosofret

3.: Jadwal LHC dan CERN 2009 - Bagian I From: haryo_cern

4.: Jadwal LHC dan CERN 2009 - Bagian II From: haryo_cern

View All Topics | Create New Topic

Messages

1.: Minta tolong data histeresis magnet permanen

Posted by: "Eric Johnson" go_learn@yahoo.co.id go_learn

Sun Feb 8, 2009 9:46 pm (PST)

Salam
Reka-rekan,
Ada yang punya data histeresis bahan magnet permanen?
saya sedang coba membuat model histeresis magnet. Untuk menguji model yang saya buat, saya perlu beberapa data histeresis magnet permanen. Adakaha dari rekan-rekan yang berbaik hati mendermakan contoh data histeresis bahan magnet nya kepada saya?

Balas via japri juga boleh

Terimakasih banyak sebelumnya

Nikmati chatting lebih sering di blog dan situs web. Gunakan Wizard Pembuat Pingbox Online. http://id.messenger.yahoo.com/pingbox/

Back to top
Reply to sender | Reply to group | Reply via web post
Messages in this topic (1)

2.: Van de Graaff generator and absurdities beginning in modern physics

Posted by: "sorincosofret" sorincosofret@yahoo.com sorincosofret

Mon Feb 9, 2009 1:31 am (PST)

Hello,

Electromagnetism is considered the most trustful part of actual
physics. There are a lot of physicists contesting the special and
general theory of relativity, a small number contesting quantum
mechanics, but none is contesting the actual electromagnetism.
It is time to revive all old und dusted experiments from
electromagnetism and to provide new explanations for them.
In attached link, Van de Graaff generator is analyzed and the
inconsistencies and absurdities accepted by actual electromagnetism
are highlighted.

http://www.elkadot.com/magneticity/Van%20de%20Graaff%20device%
20absurdities.htm

It is hilarious how a exact science like physics is not able to
solve a simple low level problem: how is possible to add a small
charge generated in the ,,friction" process or injected from a
external potential to a sphere containing a greater charge after
few second of VDG generator working.

Sorin Cosofret

Back to top
Reply to sender | Reply to group | Reply via web post
Messages in this topic (1)

3.: Jadwal LHC dan CERN 2009 - Bagian I

Posted by: "haryo_cern" Suharyo.Sumowidagdo@cern.ch haryo_cern

Mon Feb 9, 2009 1:34 am (PST)

Jum'at 6 Februari 2009 malam waktu Eropa, Direktur Jendral CERN
Rolf-Dieter Hauer mengumumkan proposal jadwal LHC tahun ini. Proposal
ini diajukan oleh Divisi Akselerator CERN (Bagian yang bertanggung
jawab atas pengoperasian akselerator LHC)

- September 2009 merupakan waktu dimana perbaikan magnet-magnet LHC
bisa diharapkan selesai.

- Diharapkan LHC bisa kembali berfungsi operasional penuh pada akhir
tahun ini dan menghasilkan data.

- Jika LHC bisa berfungsi operasional penuh, Divisi Akselerator akan
tetap mengoperasikan LHC pada musim dingin (minus liburan Natal dan
Tahun Baru) hingga awal musim semi tahun 2010.

Hari Senin (9 Februari) staf Direktorat CERN akan membahas proposal
tersebut dan membuat keputusan akhir tentang jadwal LHC dan CERN tahun
2009.

PS: Saya akan laporkan lagi nanti malam dalam Bagian II.

Siaran resmi dalam bahasa Inggris.

http://press.web.cern.ch/press/PressReleases/Releases2009/PR01.09E.html

CERN to set goals for first LHC physics

Geneva, 6 February 2009. At the conclusion of a workshop held in
Chamonix this week, recommendations have been made to the CERN1
management for the restart schedule of the Large Hadron Collider
(LHC). If accepted in a management meeting on Monday, these
recommendations will ensure that the LHC starts to produce physics
data in late 2009, running through the winter and on to autumn 2010 at
an energy of 5 TeV per beam and ensuring sufficient data for the
experiments to produce their first new physics results.

"These recommendations represent the best way forward for the LHC and
for the field of particle physics in general," said Steve Myers,
CERN's Director for Accelerators and Chair of the Chamonix workshop.

Among the topics discussed in Chamonix was the underlying cause of the
incident that brought the LHC to a standstill on 19 September last
year. The incident was traced to a faulty electrical connection
between segments of the LHC's superconducting cable. Since the
incident, enormous progress has been made in developing techniques to
detect any small anomaly. These will be used in order to get a
complete picture of the resistance in the splices of all magnets
installed in the machine. This will allow improved early warning of
any additional suspicious splices during operation. The early warning
systems will be in place and fully tested before restarting the LHC.

Following the incident, a further two suspect connections have been
identified. One of these has now been investigated, revealing that the
splice between cables had not been correctly carried out. As a result
the magnet containing the second will also be removed from the tunnel
for repair. Since resistance tests can only be conducted in cold
magnets, three of the LHC's eight sectors remain to be tested: sector
3-4 where the original incident occurred and the sectors on either
side. Within sector 3-4, the 53 magnets that are being replaced in the
tunnel will all be tested before cool down, and the sectors either
side will be cooled down early enough to intervene if necessary with
no impact on the schedule. This leaves around 100 dipole magnets that
cannot be tested until September, and a correspondingly small chance
that repairs may run into currently scheduled running time.

"CERN's priority for 2009 is to get collision data for the
experiments, but with caution as the guiding principle," said Myers.
"The recommendations made to the CERN management are cautious, while
achieving the goal of running this year."

"A lot of hard work went into the Chamonix workshop," said CERN
Director General Rolf Heuer, "giving my management team all we need to
make the right decision on LHC restart when we next meet on Monday."

The restart schedule for the LHC will be announced following the CERN
Directorate meeting on Monday 9 February.

1. CERN, the European Organization for Nuclear Research, is the
world's leading laboratory for particle physics. It has its
headquarters in Geneva. At present, its Member States are Austria,
Belgium, Bulgaria, the Czech Republic, Denmark, Finland, France,
Germany, Greece, Hungary, Italy, Netherlands, Norway, Poland,
Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
India, Israel, Japan, the Russian Federation, the United States of
America, Turkey, the European Commission and UNESCO have Observer status.

Back to top
Reply to sender | Reply to group | Reply via web post
Messages in this topic (1)

4.: Jadwal LHC dan CERN 2009 - Bagian II

Posted by: "haryo_cern" Suharyo.Sumowidagdo@cern.ch haryo_cern

Mon Feb 9, 2009 12:16 pm (PST)

Pukul 20:19 waktu Geneva, Direktur Jendral CERN mengumumkan bahwa
akselerator LHC direncakanan akan kembali beroperasi pada akhir
September 2009. Akselerator LHC diharapkan dapat menghasilkan data
untuk analisis mulai bulan Oktober. LHC akan dijalankan terus selama
musim dingin, dengan jeda singkat diharapkan sekitar Natal dan Tahun Baru.

Ini kutipan dari e-mail yang saya terima, siaran pers lengkap saya
kira akan menyusul.

The CERN Management today confirmed the restart schedule for the Large
Hadron Collider resulting from the recommendations from the Chamonix
workshop. The new schedule foresees first beams in the LHC at the end
of September this year, with collisions following in late October. A
short technical stop has also been foreseen over the Christmas period.
The LHC will then run through to autumn next year, ensuring that the
experiments have adequate data to carry out their first new physics
analyses and have results to announce in 2010. The new schedule also
permits the possible collisions of lead ions in 2010.

This new schedule represents a delay of 6 weeks with respect to the
previous schedule which foresaw LHC "cold at the beginning of July".
The cause of this delay is due to several factors such as
implementation of a new enhanced protection system for the busbar and
magnet splices, installation of new pressure relief valves to reduce
the collateral damage in case of a repeat incident, application of
more stringent safety constraints, and scheduling constraints
associated with helium transfer and storage.

In Chamonix there was consensus among all the technical specialists
that the new schedule is tight but realistic.

The enhanced protection system measures the electrical resistance in
the cable joints (splices) and is much more sensitive than the system
existing on 19 September.

The new pressure relief system has been designed in two phases. The
first phase involves installation of relief valves on existing vacuum
ports in the whole ring. Calculations have shown that in an incident
similar to that of 19 September, the collateral damage (to the
interconnects and super-insulation) would be minor with this first phase.

The second phase involves adding additional relief valves on all the
dipole magnets and would guarantee minor collateral damage (to the
interconnects and super-insulation) in all worst cases over the life
of the LHC. One of the questions discussed in Chamonix was whether to
warm up the whole LHC machine in 2009 so as to complete the
installation of these new pressure relief valves or to perform these
modifications on sectors that were warmed up for other reasons. The
Management has decided for 2009 to install relief valves on the four
sectors that were already foreseen to be warmed up. The dipoles in the
remaining four sectors will be equipped in 2010.

Back to top
Reply to sender | Reply to group | Reply via web post
Messages in this topic (1)

Create New Topic | Visit Your Group on the Web

Messages | Files | Photos | Calendar

===============================================================
** Arsip : http://members.tripod.com/~fisika/
** Ingin Berhenti : silahkan mengirim email kosong ke :
<fisika_indonesia-unsubscribe@yahoogroups.com>
===============================================================

MARKETPLACE

From kitchen basics to easy recipes - join the Group from Kraft Foods