Editor-in-Chief : V.K. Rastogi
ASIAN JOURNAL OF PHYSICS
An International Peer Reviewed Research Journal
Frequency : Monthly,
ISSN : 0971 – 3093
Editor-In-Chief (Hon.) :
Dr. V.K. Rastogi
e-mail:[email protected]
[email protected]
| AJP | ISSN : 0971 – 3093 Vol 10, No 3, July – September, 2001 |
Asian
Journal of Physics
Vol 10, No 3, July – September, 2001
Asian Journal of Physics
Vol 10, No 3 (2001) 303-454
(An International Quarterly
Research Journal of Physics)
(A Non-Profitable Registered Publication)
CONTENTS
|
Quantum mechanics on a lattice |
|
|
F T Lee |
303 |
|
Monitoring of ozone, water vapour etc during the voyage to Antarctica |
|
|
S L Jain |
315 |
|
Investigations on atmospheric humidity profile at varying oxygen
levels with a laser based monitoring
system |
|
|
D Das, G A Ahmad, G K D Mazumdar and
A Choudhury |
323 |
|
Experimental study of 2D turbulence in soap films |
|
|
K Pal and S Chopra |
331 |
|
The electronic absorption spectra of four disubstituted phenols |
|
|
R Kanna Rao, A Srinivasa Rao and D V
Krishna Rao |
337 |
|
Study of microstrip antennas using different materials |
|
|
S N Mulgi, R M Vani, P V
Hunagund and Sara Fatima Farida |
355 |
|
Lattice dynamics of TAC and HFC using three-body force shell model |
|
|
S Mohan and K Sonamuthu |
359 |
|
Phase transitions in solid solutions of alloy
semiconductors : Ga1-x,
InxSb and Ga1-x
InxP |
|
|
Sadhna
Singh |
363 |
|
Latitudinal dependence of solar wind speed and the sunspot cycle |
|
|
T E Girish and G Gopkumar |
369 |
|
A non linear
impurity in two-dimensional systems |
|
|
R S Roy |
375 |
|
Comparative study of Forbush decrease
with geomagnetic storm sudden commencement |
|
|
P L Verma and S K Nigam |
379 |
|
High frequency dielectric behaviour of erbium substituted Ni-Zn
ferrites |
|
|
K Vijaya Kumar and D Ravinder |
391 |
|
Relationship among various interplanetary indices during maximum
and minimum solar activity |
|
|
G N Singh and Pankaj Kumar Shrivastava |
397 |
|
A relation between cosmic rays and Dst
field |
|
|
M Lal and Pankaj K Srivastava |
403 |
|
Studies on coronal mass ejections classified according to their
speeds |
|
|
T K Das and MK Ghosh |
409 |
|
Influence of pressure on cosmic ray intensity at neutron monitor
energies. |
|
|
G.N Singh and Pankaj Kumar Srivastava |
417 |
|
On the crystallographic aspects of some naturally occurring simple
and furano coumarins |
|
|
Rajnikant,
V K Gupta, Dinesh and Mousmi Bhat |
421 |
|
Single crystal growth and X-ray crystallograhphic
analysis of some 4, 4'-substituted biphenyls |
|
|
Rajnikant,
V K Gupta, A Kumar, R Gupta, A Kumar, Dinesh and
Ashu Sawhney |
431 |
|
Conformational analysis of some steroidal molecules |
|
|
Rajnikant,
V K Gupta, Dinesh and Mousmi Bhat |
439 |
|
Thermal and FTIR spectroscopic studies of aspirin single crystal |
|
|
Sanjay P Vachhani, R M
Dabhi and M J Joshi |
447 |
Vol 10, No 3 (2001)323-330
Investigations on atmospheric
humidity profile at varying oxygen levels with
a
laser based monitoring system
D Das1, G
A Ahmed2, G K D Mazumder3 and
A Choudhury4
1Department
of Physics, North Gauhati College, 781031, Assam,
India
2Department
of Physics, Tezpur University 784028, Assam, India.
3USIC,
Gauhati University, 781014, Assam, India.
4Department
of Physics, Tezpur University, 784028, Assam, India
[email protected]; [email protected]
A laser
based Air Quality Monitoring system was designed and fabricated in
an attempt to synthesize design principles of a nephelometer and a
transmissiometer and monitor specific constituents
of the atmosphere. Essentially in the system light from a He-Ne laser source
passes through a simulation chamber and the extinction and scattering is
monitored by a set of phototransistor based detectors.
The signals from the detectors are digitized and interfaced to a personal
computer, where a data acquisition software "moniotors"
and records the data which is subsequently analyzed
using spreadsheet programs. This paper reports the design aspects of the
fabricated instrument and gives the findings of investigations done on atmospheric
humidity at varying oxygen levels. ©Anita Publications. All rights reserved.
References
1. Ahmed G A,
Mazumder G K D, Choudhary A, J Instrument Sot
India, 26 (1996) 734.
2. Pritchard B S. Elliott W G,
J Opt Soc Am, 50 (1960) 191.
3. Jonasz
M. Appl Opt,
29, (1990) 64.
4. Hinkley E D, Laser monitoring
of the atmosphere, (Springer – Verlag, Berlin), 1976, p 62.
[Received
: 12.3.2001]