Home | CURRENT activities | 4th alpine SSNMR | ICMM2006 | EUROMAR_MRSFall_2006 | EUROMAR2007 | EUROMAR2008 | ICS_FD_NRC_IISC | 96th indian Science Congress, 2009, NEHU, Shillong | Video Summary | EPISTME2:Account on bulk effect calculation | Explaining Trends of Nuclear Shielding | Education Home Room | UGC Innovation Program NEHU | Webpages Relocated after Closure of Geocities | aravamudhan_resume | aravamudhan_biodata | aravamudhan: Contact_info

aram_nehu

Institute Centenary Symposium, IISC; Future Directions in NMR

Feature above: Raginiyohn sey sajaya bharat....
A national song - audio recording from Door Darshan telecast...
5 minutes duration... manual start and repeatedly playing..
added on 16th April 2013.

The Sympsium WebSite is at URL: "http://sif.iisc.ernet.in/nmrsymp/"

Photograph of Dr.S.Aravamudhan
Dr.S.Aravamudhan--Click on Photo for Resume
CLICK on PHOTO for Resume

CLICK HERE for itinerary of Dr.S.Aravamudhan for participation in ICS-FD, IISc, Oct08
CLICK HERE  to JUMP to view presentation materials

Today's date:

This page counter was set on August 28, 2008

Extracted from the Suymposium Website
ics_fd_symposium_selectedparticipants_redcd.jpg
CLICK on Picture for the EENC/AMPERE, Lille, France presentation

Dr.S.Aravamudhan among the list of selected
aravamudhan_selcted.jpg

Today's date:

This page counter was set on August 28, 2008

Presentation Materials
Re-installed on Monday, Oct 13, 2008

ABSTRACT

COMMENTS AND CLARIFICATIONS: CALCULATING INDUCED FIELD DISTRIBUTION IN SPECIMEN WITH INHOMOGENEOUS CONSTITUTION; AND, WHEN THE SHAPE IS NOT REGULAR.

 

S.Aravamudhan

 

Department of Chemistry, North Eastern Hill University, Shillong 793022 Meghalaya, INDIA

 

        The calculation of induced field distribution is the procedure by which the Demagnetization factors values can be obtained for homogeneously magnetized specimen. The demagnetization factor values can be of significance mainly when the specimen is homogenously magnetized. When the material medium is homogeneous, the magnetization in a magnetic field can be homogeneous only for the regular ellipsoidal shapes, spherical shape being a special case of the general ellipsoid.

 

       The case of a top-shaped and the cylindrically shaped specimen had been considered earlier (1). These shapes are not ellipsoidal but a simple summation procedure, which can reproduce the known demagnetization factors, could be used to calculate the induced field contributions within the specimen for the above two cases of non-ellipsoidal regular shapes.

 

       The case of inhomogeneous material medium was considered in another previous work (2). The above summation procedure could have a simple modification for handling the case of inhomogeneous material and the method for the calculation of induced field contributions within such specimen was illustrated.

 

       The question of whether, any kind of demagnetization factor can be attributed for such shapes and materials was considered in a much earlier (3) contribution. In view of the micro-macro paradox in the context of calculation of induced fields as pointed out in a recent contribution (4), the above discussions (in 1,2 and 3) would be consolidated and clarifications would be added for the necessary significance of the calculation procedures in the respective contexts.

 

1. http://nehuacin.tripod.com/id3.html (4th Alpine Conference on SSNMR)

2. http://www.geocities.com/inboxnehu_sa/nmrs2005_icmrbs.html

3. http://nehuacin.tripod.com/id1.html (EUROMAR2006)

4. http://nehuacin.tripod.com/id5.html (EUROMAR2008)

 

 

 

 

 

inboxnehu_sa@yahoo.com 

URL: http://nehuacin.tripod.com/id6.html



POSTER SITE
SHEET-1
SHEET-2
SHEET-3
SHEET-4
SHEET-5
SHEET-6
SHEET-7
SHEET-8
SHEET-9
SHEET-10
SHEET-11
SHEET-12
SHEET-13
SHEET-14
SHEET-15
SHEET-16
SHEET-17
SHEET-18
SHEET-19
SHEET-20

Download from this Link: http://ugc-inno-nehu.com/FDNMR_SHEETS_01_20.doc  in a single (MS WORD document) file all the 20 pages of display.

CLICK HERE  to download an article (MS WORD) on "Dividing a Magnetic Moment and Distributing the Parts, can it ensure a Better Validity of the Point Dipole Approximation?"  [contributed paper for   http://www.isc2009nehu.com/ ]

The Webpage for participation in 96th Science Congress 2009 at NEHU


SHEET-01: Contents and index to display sheets

SHEET-02:The typical NMR Experiment the results of which required a consideration of this nature: the bulk susceptibility and contributions to induced field distribution. COMMENT on the procedure (The context still remains predominantly HR PMR in Single Crystal Solids)

SHEET-03: CLARIFICATION-Reproducing the Standard Values of the Demagnetization factors is a test for the validity of the Mathematical procedure used for estimating induced field distributions. (Also a note on the first time occurrence in such experiments)

SHEET-04: COMMENT on the necessity of surface charges description. Consolidated depiction of the situation on the induced field distribution and shape dependent shift/broadening

SHEET-05: COMPARISON of standard results of Demagnetization factor and the values obtained by a more convenient procedure for accounting for the Induced Fields within Magnetized Materials. Equivalence of the two methods evidenced ---- COMMENT

SHEETS-06: COMMENT ----- To describe a Paradoxical Situation: begin with the excerpt copied from the Reference given below:                       

 "Reviews of Modern Physics, Vol. 64,No.2, April 1992"

SHEET-07 &08: CLARIFICATION- on the above paradoxical situation

SHEET-09,10 & 11: Description of convenient summation improving the validity of point dipole approximation: CLARIFICATION

SHEET-12: COMMENT-----Advantages of the summation method described in the previous sheets: (An alternative method for demagnetization factor calculation)

http://www.geocities.com/inboxnehu_sa/nmrs2005_icmrbs.html

SHEET-13: CLARIFICATION--- Demagnetization factors for novel combinations of inner and outer shapes.

SHEET-14 & 15: COMMENT On the consideration of unconventional inner volume elements   http://www.geocities.com/saravamudhan1944/eenc_ampere_lille.html

SHEET-16: The series of questions, which are being clarified------ CLARIFICATION

http://nehuacin.tripod.com/id3.html

SHEET-17 & 18: CLARIFICATION Induced Field outside the specimen: Evidence of the Elegance of approach.

SHEET-19 &20: Comments & Clarifications in Conclusion

Powerpoint presentation files relevant for a Review of the poster contents:

File Name

Number of slides                                        

Description of Content

ICS_FD_1.ppt

11

Summing the contributions to induced field from Discrete region.

ICS_FD_2.ppt

13

Shape dependent demagnetization factor and the consequences of in-homogeneity in the case of arbitrary shapes of specimen. Description of the convenient summing procedure.

ICS_FD_2_1.ppt

2

Tables comparing demagnetization factor values: The standard table known and the values obtained by the alternative procedure.

ICS_FD_3.ppt

16

In-homogeneity and convenient calculation for a variety of shapes and the discussion on the trends.

ICS_FD_4.ppt

5

Calculation of induced fields at regions outside the magnetized specimen

ICS_FD_5.ppt

6

Envisaging the trends for possible calculation of line shapes in the NMR spectra of in-homogeneously magnetized specimen.

 Table above posted on Wednesday, September 24, 2008

The Presentation File for  MRSFall2006

4th Alpine Conference on SSNMR: Powerpoint review

(Please NOTE: The files are of about 5 MB size and downloading from the site would take considerable time: Preferably opt to "save to disk" and then view)


An event in Shillong  immediately following th FD NMR 2008

Tripod-site number 2 for Documenting Scientific Activities; / ealier site (full capacity contents) http://saravamudhan.tripod.com/