Tamil Nadu Agricultural University, Tamil Nadu, India (1995-1999).
o Bachelor of Engineering in Agricultural Engineering - GPA 8.84/10.00.
SELECTED AWARDS AND HONORS
Annual graduate exhibition, Pennsylvania State University
Third place, 2005
Discussion (or interpretation of the results)
Summary (or conclusions)
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Moi University, Eldoret, Kenya
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Staphylococcus aureus by pulsed UV-light treatment. Journal of Food Protection.
Krishnamurthy, K. and A. Demirci. 2006. Disinfection of water through
flowthrough ultraviolet light disinfection system. Ultrapure Water (In review)
A Thesis Submitted in Partial Fulfillment of the Requirements for the degree of
Doctor of Philosophy of
the Department of Zoology, Moi University
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This thesis is my original work and has not been pres
s(s2 + 2s - 1)
Determine the range of K for which the closed-loop system with unity negative
which incorporated this plant would be stable.
Solution: This system has one unstable pole (at s = 0.4142), an we need therefore
one counter clockwi
Pole: -3.12 - 7.16i
Overshoot (%): 25.4
Frequency (rad/sec): 7.81
Does the closed-loop system have the desired behavior, that is, does it behave like
second order system with damping ratio = 0.0707? T
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Whos Who, 1897-1996: One Hundred Years of Biography. CD-ROM. London:
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Sensor, Actuator, Detector, Transmitter:
A sensor is a device that detects or measures a
physical quantity a very simple measuring
An actuator (an opposite device of a sensor) is a
device that converts a signal (usually electrical) to
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LIST OF FIGURES
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> > h = ylabel('Imaginary Axis');
> > set(h,'fontsize',14);
> > print -depsc 'figure6.eps'
The nyquist plot is below:
-6 -4 -2 0 2 4
The closure of the Nyquist plot is a bit tricky. Since the Nyquist contour in
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Approach. 2nd Ed. London: Pitman Publishing, 1997.
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Vickers, Peter, and John Martyn, Eds. The Impact of Electronic Publishing on
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Solution: The root locus may be obtained by the commands:
> > den = conv([1 3 0],[1 6 64])
1 9 82 192 0
> > num = [0 0 0 0 1];
> > % set the range of gains fine enough to figure out the right gain
> > % to get 0.707 damping
> > k=logspace(-5,5,1
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Problem 3: A unity gain negative feedback system has an open-loop transfer
G(s) = K(1 + 5s)
s(1 + 10s)(1 + s)2
Draw a Bode diagram for this system and determine the loop gain K required for a
margin of 20 deg. What is the ga
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s3 + (5 + K)s2 + (6 + K)s + 2K = 0
Solution: The equation can be rewritten as
s3 + 5s2 + 6s + K s2 + s + 2 = 0
This equation is essentially the characteristic equation for a system with open-loop
the roots of s2 + s + 2 = 0 and open-
Adams, Roy. Communication and Delivery Systems for Librarians. Aldershot:
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Longenecker, Justin, G., Carlos, W. Moore and J. William Petty. Small
-0.8 < -1/K < 0
which implies that
1 = 1.25
Indeed, the characteristic equation for K = 1.25 is
(s) = (s3 + 2s2 - s) + 1.25 (s + 0.4) = s3 + 2s2 + 0.25s + 0.5 = 0
which has roots at
s = -2, s = 0.5j
That is, for K = 1.25, the closed-loop s
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Ghosh, S. Improved Sludge Gasification by Two-Phase Anaerobic Digestion.
of Environmental Engineering 113:1265-1283
Vickery, Brian C. Knowledge Discovery from Databases: An Introductory
Mombasa Kwale Area. Report No.24. Nairobi: Geological Survey of Kenya,
Raitt, David, I. and Ben Jeapes, Eds. Online Information 94: 18th International
Information Meeting Proceedings. London: 608 December 1994