Abstracts of Journal
Papers (1990-1999)
Abstracts
of Journal Papers (1980-1989) (2000-2005)
1998 1997 1996 1994 1993 1992 1990
1998
J22: Physics of
Scoliosis Screening in School-Going Children
Work done at: UNIVERSITY OF KARACHI, University Road,
Karachi
75270, Pakistan
Kamal SA ,
Naseeruddin, Waseem M, Firdous S, Karachi University
Journal of Science 26(1), 1998, 5-12
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Scoliosis, lateral curvature of the spinal column, effects children
during their growth period. If untreated it may disfigure the body,
cosmetically, and may effect the vital organs, such as the heart
and the lungs. Heavy school bags, if improperly worn, do not con-
tribute to scholarship, but to curvatures of the spinal column
in young children. A scoliosis screening program, involving visual
observation of back, forward-bending test and moiré fringe topo-
graphy, was formulated, which was quick, reproducible and
inexpensive. These tests were integrated to minimize the number
of false positives at the same time having a high degree of sensitivity. Our
goal was to screen for curvatures of the spinal column at the same time
minimizing the X-ray exposure to children. Paper PDF
J21: Accuracy and Precision of Moiré Fringe Topography System
Work done
at: UNIVERSITY OF KARACHI, University Road, Karachi 75270,
Pakistan
Naseeruddin, Kamal SA,
Firdous S, Journal of Natural Sciences and Mathematics 38(1 & 2),
1998, 157-166
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Moiré fringe topography is simple, noncontact, noninvasive and nondestructive,
photogrammetric technique, which provides three-dimensional map of a study
subject/object (human body, precision instrument), without using the X rays or
any other ionizing radiation. The technique of moiré fringe topography consists
of photo-graphing the study object through a specially- constructed screen.
Dark fringes are produced because of the presence of screen. Accuracy and
precision of shadow-type, fishing-line, moiré-fringe-topography system were
determined as 99.61% and 91.21%, respectively. Paper PDF
1997
J20: EEG in
Weightlessness: A Theoretical Estimate
Work done at: UNIVERSITY OF KARACHI, University Road,
Karachi 75270, Pakistan
Ahmed SN, Kamal SA, Siddiqui KA, Husain SA, Naeem M, Karachi
University Journal of Science 25(1), 1997,
19-24 — corresponding author
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The effects of a weak gravitational field on the global electrocortical
activity were considered in the framework
of a generalized coupling model developed earlier. First-order shifts in the
EEG frequencies were calculated.
Paper PDF
J19: The
Covariant-Generalized-Coupling Model of Global-Electrocortical Activity
Work done at: UNIVERSITY OF KARACHI, University Road,
Karachi 75270, Pakistan
Kamal SA, Siddiqui KA, Karachi University Journal of
Science 25(1), 1997, 29-39
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Global electrocortical activity of the human brain was modeled as a system of
driven-harmonic oscillators. The equations, written in a covariant form,
employed a generalized coupling, dependent on both the electrical poten-tials
and their rates of change. Predictions were in terms of first-order shifts of
the EEG frequencies in the presence of weak, time-varying magnetic field,
applied externally. A condition of impedance matching related
the coupling parameters and the damping coefficients. Paper
PDF
1996
J18: A 3-D-Static Model of the Human Spinal Column
Work done at: UNIVERSITY OF KARACHI, University Road,
Karachi 75270, Pakistan
Kamal SA , Karachi
University Journal of Science 24(1), 1996, 29-34
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A 3-D static model of the human spinal column put forward by the author was
refined. A method was given to generate a 3-D outline of the human spinal
column from the moiré topograph of human back in the anatomical position. Paper PDF
J17: Combination of Moiré Contours
and Edge-Based Algorithm to Study Motion in Sagittal Plane
Work done at: UNIVERSITY OF KARACHI, University Road, Karachi 75270,
Pakistan
Kamal SA, Karachi
University Journal of Science 24(2), 1996, 53-60
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Moiré fringe topography is noninvasive, noncontact and nondestructive, 3-D
optical imaging technique, which provides object-height maps. Edge-based algorithm
may be used to study infinitesimal movement of the edge in the image plane.
Application of the edge-based algorithm theory to the moiré contours enabled
one to study and to quantify motion along an axis normal to the plane of this
image. Paper
PDF
J16: Gait Analysis using Moiré Fringe
Topography and Rasterstereography (Simultaneous Recording)
Work done at: UNIVERSITY OF KARACHI, University Road,
Karachi 75270, Pakistan
Kamal SA,
Choudhry AS, Siddiqui YA, Karachi University Journal of Science 24(2),
1996, 7-18
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Moiré fringe topography and rasterstereography, noninvasive, noncontact and nondestructive,
3-D optical imaging techniques, are capable of providing height and curvature
maps, respectively. In gait analysis and other movement activities the same
position cannot be reproduced again. It is desired to record heights and
curvatures of human trunk (e. g., selected points on the human back) at
the same time. A technique for simultaneous moiré and raster recording was
introduced using selective-optical filtering. Paper PDF
1994
J15: A Study to Check the
Reproducibility of Moiré Topographs
Work done at: UNIVERSITY OF LUND,
Malmö General Hospital (Spinal Unit), S-21401, Malmö, Sweden
Kamal SA, Benoni G,
Willner S, Karachi University Journal of Science 22(1&2),
1994, 67-74
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Moiré fringe topography is a simple, inexpensive, noninvasive optical
technique, which provides a three-dimensional map of human body without using
ionizing radiations. The usefulness of this technique is somewhat limited
unless there is a method to obtain reproducible pictures. This paper reported
the results of a study conducted in Malmö, Sweden to test a reproducibility
method proposed by one of the authors (SAK). The results indicated that the
proposed method might be useful in obtaining reproducible pictures. Paper PDF
J14: Group Structure of a
Covariant Model of Global-Electrocortical Activity
Work done at: UNIVERSITY OF
KARACHI, University Road, Karachi 75270, Pakistan
Siddiqui KA, Kamal SA,
Husain SA, Khan NU, Karachi University Journal of Science 21(1&2),
1993, 35-38
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Group structure of a recently-developed-covariant model of
global-electrocortical activity suggested a possible link between the identity
of the group and the phenomenon of brain death. Paper PDF
1992
J13: Effects of Weak Electromagnetic
Fields on Global-Electrocortical Activity
Work done at: UNIVERSITY OF KARACHI, University Road, Karachi 75270,
Pakistan
Kamal SA, Siddiqui KA,
Husain SA, Naeem M, Khan NU, Journal of Biological Physics 18,
1992, 261-269
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Effects of weak electromagnetic fields were considered on
recently-developed-covariant and –generalized-coupling models of
global-electrocortical activity. A method to calculate the ratio of components
of signal velocities was given. Paper
PDF
J12: Effects of Weak Magnetic Fields
on Global-Electrocortical Activity
Work done at: UNIVERSITY OF
KARACHI, University Road, Karachi 75270, Pakistan
Kamal SA, Siddiqui KA,
Husain SA, Karachi University Journal of Science 20(1&2),
1992, 31-35
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Effects of weak magnetic fields were considered on a
recently-proposed-covariant model of global-electrocortical activity. A method
to calculate the ratio of components of signal velocities was given. Paper PDF
1990
J11: A Mathematical Model to
Explain the Effects of Magnetic Field on Scale Formation
Work done at: THE JOHNS HOPKINS
UNIVERSITY, Homewood Campus, Baltimore, Maryland 21218, USA
Kamal SA, Karachi University
Journal of Science 18(1&2), 1990, 1-9
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Natural water, often, contains high concentrations of calcium salts. When the
water is heated these salts precipitate out and form scale on the boiler
surfaces reducing the energy efficiency of a system, and is difficult as well
as costly to remove. Various chemical and nonchemical methods have been used to
impede or delay the scale formation. One of these methods, magnetic water
treatment, aroused great interest because of its ease of use, reliability, and
very low capital and operating costs. A mathematical model was proposed to
explain the mechanism of this process. Paper PDF
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Dear
Dr. Arif Kamal Saheb, Yours sincerely,
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Abstracts
of Journal Papers (1980-1989) (2000-2005)
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