refractive index | An-Najah Staff

Orientational Order Parameters of Nematogenic Trans – 4-Propyl ‎ Cyclohexyl-4 (Trans – 40alkyl Cyclohexyl) Benzoates‎

Wed, 2014-02-26 09:40 — Dr. Muneer Mustafa Mahd Abdoh

Journal Title, Volume, Page:

Pramana, Volume 19, Issue 4, pp 349-355

Year of Publication:

1982

Link:

http://link.springer.com/article/10.1007/BF02847775

Authors:

M M M Abdoh

Department of Physics, University of Mysore, 570 006, Mysore, India

Current Affiliation:

Department of Physics, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Srinivasa

Department of Physics, University of Mysore, 570 006, Mysore, India

Current Affiliation:

Department of Physics, University of Mysore, 570 006, Mysore, India

N C Shivaprakash

Department of Physics, University of Mysore, 570 006, Mysore, India

J Shashi-Dhara Prasad

Department of Physics, University of Mysore, 570 006, Mysore, India

Preferred Abstract (Original):

The refractive indices and densities of three members of trans-4-propyl cyclohexyl-4 (trans-4-alkyl cyclohexyl) benzoates are reported as functions of temperature in the nematic and isotropic phases. The principal molecular polarizabilities and order parameters (S) have been evaluated using the anisotropic internal field model (Neugebauer’s approach). Also order parameters have been estimated by studying the dipole-dipole splittings in the wide line proton magnetic resonance (PMR) spectra. The results obtained are in close agreement with those obtained from refractive index measurements.

Measurement of Neutral Gas Temperatures in Nitrogen-Corona Discharges

Wed, 2011-03-09 09:41 — Hikmat S. Hilal, D.Sc.

Journal Title, Volume, Page:

Indian Journal of Physics September 2011, Volume 85, Issue 9, pp 1433-1443

Year of Publication:

2011

Link:

http://link.springer.com/article/10.1007/s12648-011-0158-8

Authors:

Hikmat S. Hilal

Department of Chemistry, An-Najah N. University, PO Box 7, Nablus, West bank, Palestine

Current Affiliation:

Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine

[email protected]

Siham Khedim

Abou-beker Belkaid University- Tlemcen, B.P. 119, 13000, Tlemcen, Algeria

Ali Cheknane

Laboratoire d’Etude et Développement des matériaux Diélectriques et Semiconducteurs, Université Amar Telidji de Laghouat, Algérie

[email protected]

Boumediène.Benyoucef

Abou-beker Belkaid University- Tlemcen, B.P. 119, 13000, Tlemcen, Algeria

Preferred Abstract (Original):

The temperature of neutral gas of the nitrogen-corona discharge has been measured using a Mach-Zehnder interferometer. The variation of the optical path in the interferometer has been measured, together with the refraction index. Density variations were also calculated. Values of measured temperatures of the neutrals in the corona discharge were obtained under both positive and negative coronas.