22nd Annual Faculty Academic Contributions Virtual Exhibit |
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The following items, arranged by the author's last name, were part of the 2006 exhibit:
Anderson-Holtz,
Iber-Neugebauer, and
Olaniran-Warner
Todd A. Anderson, Associate Professor in Environmental
Toxicology
Todd A. Anderson, Associate Professor in Environmental
Toxicology
Todd A. Anderson, Associate Professor in Environmental
Toxicology
Abstact: The determination of
perchlorate in complex matrices by ion chromatography (IC) with an
online preconcentration and preelution technique is discussed. The
method was applied to different sample types containing large
concentrations of matrix anions that would otherwise interfere with
analysis via conventional IC. The present approach was highly
effective in removing most of the matrix anions and was thus
resistant to the interferences commonly encountered in a high ionic
strength background. Method performance was evaluated by analyzing
for low-level perchlorate in synthetic high ionic strength
solutions, tissue extracts, and hydroponic nitrate fertilizer
samples. Not only is it easier to practice the present method
compared to USEPA Method 314.0, but for most of these samples the
present approach provided equal to or better recovery of perchlorate
than Method 314.0. With a sample of specific conductance 12,650 μS
cm-1, for example, the present method provided a perchlorate
recovery of 101% at the 25 μg L-1 level versus 89% by EPA Method
314.0. Method detection limits of perchlorate in hydroponic
fertilizer samples with this method (130-190 μg kg-1) are the lowest
thus far reported. © 2004 Elsevier B.V. All rights reserved. (19
refs.)
Todd A. Anderson, Associate Professor in Environmental Toxicology Abstact: The fate of perchlorate
(ClO4-) in streambed sediments is becoming a concern due to the
increasing number of groundwater and surface water contamination
sites in the United States. Dialysis samplers were deployed at three
sites over a period of 1 year to determine the vertical distribution
of ClO4- in sediment pore water. Results indicated that the spatial
and temporal ClO4- penetration into sediments could be affected by
numerous factors, such as temperature, microbial degradation, ClO4-
surface water concentration, and sediment physico-geological
properties. In general, maximum ClO 4- penetration into sediments at
the studied sites was 30 cm below the sediment-water surface. The
vertical sequential depletion of electron acceptors in sediments
suggested that microbial reduction was responsible for ClO4-
depletion in stream sediments. Biodegradation of ClO4- occurred over
a seasonally variable active depth zone of 1-10 cm. Results implied
that there was a rapid natural attenuation potential of perchlorate
in saturated near-surface sediments. © 2005 Elsevier Ltd. All rights
reserved. (25 refs.)
Todd A. Anderson, Associate Professor in Environmental Toxicology
Abstact: "The Poincaré Metric and
Isoperimetric Inequalties for Hyperbolic Polygons," Transactions of
the American Mathematical Society, Vol. 357 No. 10. 3905-3932. Roger Barnard, Mathematics Bio: Roger W. Barnard received his B.S. and M.A. from
Kent State University in 1966 and 1968 respectively. He received his
PhD in mathematics from the University of Maryland in 1971. He had a
two year NSF Post doctorate at the University of Kentucky from
1971-1973. He came to Texas Tech University as a visiting lecturer
in the Fall of 1973. He has held visiting positions for at least a
semester at the University of Kentucky, Indiana University and
University of California, San Diego. He has been a professor of
mathematics and statistics at Texas Tech University since 1986. Dr.
Barnard's research interests have been diverse. The primary fields
have been in geometric function theory in complex analysis and
special function theory of mathematical physics. He has published
papers in statistics, control theory, differential equations, real
analysis and several complex variables. He has been the complex
analysis and special function theory editor for the Rocky Mountain
Journal of Mathematics since 1991. Abstact: "We prove several isoperimetric inequalities for the
conformal radius (or equivalently for the Poincaré density) of
polygons on the hyperbolic plane. Our results include, as limit
cases, the isoperimetric inequality for the conformal radius of
Euclidean $n$-gons conjectured by G. Pólya and G. Szegö in 1951 and
a similar inequality for the hyperbolic $n$-gons of the maximal
hyperbolic area conjectured by J. Hersch. Both conjectures have been
proved in previous papers by the third author." "Our approach uses the method based
on a special triangulation of polygons and weighted inequalities for the reduced
modules of trilaterals developed by A. Yu. Solynin. We also employ the
dissymmetrization transformation of V. N. Dubinin. As an important part of our
proofs, we obtain monotonicity and convexity results for special combinations of
the Euler gamma functions, which appear to have a significant interest in their
own right." "Concentration of Area in
Half-Planes," Proceedings of the American Mathematical Society, Vol.
133, No. 7. 2091-2099. Roger Barnard, Professor in Mathematics Abstact: Let S denote the class of functions f(z) =
z +a2z2 +. . . which are analytic and univalent in the unit disk U. The
authors solve the problem of determining the sharp lower bound for the area of
f(U) that is concentrated in a half-plane; i.e., for real d, they determine
the sharp lower bound for the quantity Af (d) = Area (f(U)\H+d ), where H+d =
{w: Rew > d}. Let A(d) = inf{Af (d): f 2 S}. Then A(d) =
_ on (−1, d0], A(d) decreases continuously to 0 on the interval [d0, 12], and
A(d) = 0 on [12,+1), where d0 = −1.1173 . . . is the solution to a complicated
equation involving d. (Since z/(1+d) maps U onto the half plane {w: Re < 12},
it is clear that A(d) = 0 on [12,+1).) For d0 < d < 12, there is a unique
extremal function fd(z) that is too complicated to be stated here; for d < d0,
the unique extremal function is fd(z) = z, and for d = d0, both functions are
extremal. In all cases, the ranges of the extremal functions are described. They all possess Steiner symmetry and P´olya
symmetry. If fd(U) is bounded, then fd(U) = U; if fd(U) is unbounded, then it
properly contains the half-plane {w: Rew < d} and has a single symmetrical
“bubble” attached on the right.
Glen Biglaiser, Assistant Professor in Political Science
Bio: Glen A. Biglaiser is an Assistant Professor in the Department
of Political Science. Biglaiser earned his Ph.D. from UCLA. His
research interests are Comparative Politics, Latin American
Politics, and Economic and Political Issues in the Developing World.
He is the author of: Guardians of the Nation? Economists, Generals,
and Economic Reform in Latin America and has published extensively
on issues of political and economic development.
Abstact: Over the past two decades Latin America has experienced a
foreign direct investment (FDI) revival (Birch 1991, 149; Grosse
2001, 119). Concurrent with renewed interest in FDI, most Latin
American countries have implemented market-oriented reforms. Capital
shortages, caused in part by protectionist, import-substitution
industrialization (ISI) policies in the 1940s 1970s, led many
countries to shift economic policy course in the 1980s. Latin
American policy makers hoped that initiating reforms would signal
their governments creditworthiness and good intentions to
prospective foreign investors (Rodrik 1996, 28). Despite the breadth
of new investments and adoption of economic reforms, FDI has varied
among countries. Do different market-oriented reforms affect FDI
inflows to Latin American countries?
Michael Borshuk, Assistant Professor in English
Bio: This is at my second year at Texas Tech, after graduate studies
at the University of Alberta in Canada. I teach African American
literature, but also write on jazz regularly for Coda Magazine.
Abstact: This book charts a jazz-influenced tradition in African American
modernist writing, between the 1920s and the 1970s. Looking at the
relationship between jazz and African American writing over changes
in musical styles, the work considers expansively the music 's
aesthetic and political influence.
Laura Calkins, Assistant Archivist
Bio: Dr. Laura M Calkins holds degrees from Michigan State
University, the London School of Economics, and the School of
Oriental and African Studies (SOAS), London, as well as a doctorate
in the Modern International History of Asia from the University of
London, England. She has held a Fulbright Scholarship to the United
Kingdom and a National Science Foundation Postdoctoral Fellowship in
radiological physics at the University of Michigan.
Abstact: Between 1965 and 1973 the Vietnam War claimed over 58,000
American lives, many thousands more Allied troops from Australia,
New Zealand, and South Korea, as well as hundreds of thousands of
troops and civilians in North and South Vietnam, Laos, Cambodia, and
Thailand. Collected here are the first-hand stories of men and women
who witnessed and participated in the Vietnam War. From operations
on the ground in Southeast Asia to the domestic upheaval in America,
these compelling accounts bring the reader to the forefront of
America 's longest war. "Art work from the exhibit "Captain
Cook And The Spirit of Discovery" Bruce Cammack, Associate Librarian for Rare Books Bio: Since my arrival at Texas Tech University in 1987, one of my
missions and passions has been to lower as many barriers between the
holdings of Rare Books and the public. The Science Spectrum Exhibit
provided an ideal venue, presenting to the people of the South
Plains the opportunity to examine, enjoy and learn from a gathering
of maps, prints, and artifacts, many of which were over 200 years
old and literally from the other side of the world. Abstact: Interactive world map displayed at the Science Spectrum,
Lubbock, Texas illustrating Captain James Cook 's three voyages to
the Pacific (1768-1779). Original map provided by Rare Books, TTU
Libraries. Panel and stand created by the following Science Spectrum
staff: Elton Prater, Greg Watson, Leroy Gomez and Brad Sumner.
Paul Carlson, Professor in History Bio: Paul H. Carlson is a professor in the Department
of History. Carlson has published nine books and
several dozen articles, essays, and book reviews. His most recent
book is Deep Time and the Texas High Plains: History and Geology
(Texas Tech, 2005). Another book, The Plains Indians (1998), was a
History Book Club selection and was published in a French language
translation (Paris, 2004). In 2005, he received the Professing
Excellence Award (for outstanding teaching) from Residence Life
students. In 2000, he received from the College of Arts and
Sciences its Outstanding Researcher Award. Carlson has served on
advisory committees for the Handbook of Texas, the Texas Department
of Parks and Wildlife, and several historical associations. He is a
member of the Board of Directors of the Texas State Historical
Association, and he is a Fellow of the organization. In 1993,
Carlson received the President's Excellence in Teaching Award at
Texas Tech, and twice in recent years students have named him the
history department's Outstanding Faculty member. He is director of
The Texas Tech Center for the Southwest.
Abstact:
Locke Carter, Associate Professor in English Bio: Locke Carter teaches courses in argumentation, distance
education, hypertext, usability research, publication management,
and rhetoric & technology in Technical Communication and Rhetoric.
He wrote the proposal for, and currently manages, his program 's PhD
degree offered via distance education. He recently received one of
three STC development grants for a proposal to study the value of
communication activities within organizations. Before coming to
Texas Tech, he was the CEO of the Austin-based Daedalus Group, Inc. Abstact: Much of the theory underlying technical communication,
rhetoric, composition, and college English in general comes from a
decidedly socialist perspective. Thus, these fields have
disenfranchised themselves from the larger world-view free-market,
competitive, and capitalistic. Market Matters addresses this problem
by asserting a theoretical and practical stance based on free market
mechanisms and arguing that a) writing disciplines have market
value, which socialist approaches to rhetoric cannot recognize and
b) markets are inherently rhetorical, creating information, being
subject to socially-constructed trends, and persuading participants.
In other words, the market isn 't "out there, " but is a natural,
logical domain for rhetorical study.
Sankar Chatterjee, Horn Professor in Museum Science and
Geosciences
Bio: Sankar Chatterjee is Paul Whitfield Horn Profeessor of
Geosciences and Curator of Paleontology at the Museum of TTU. He has
led several expeditions to Antarctica, China, India, and the
American Southwest in search of the dinosaurs and early birds. He
has published more than 100 articles and three books and his
research has been funded by the NSF, Narional Geographic Society,
and Smithsonian Institute. His research interests include plate
tectonics, mass extinction, impact cratering process, Mesozoic
vertebrates, and flight of animals.
Abstact: A beautiful skull of Camarasaurus, a Late Jurassic (about
160 million years ago) sauropod dinosaur from Utah provides critical
information about its neuroanatomy, tooth morphology, and tooth
replacement. The endocast reveals the primitive architecture of the
brain, which is short, narrow, and deep, with prominent cerebral and
pontine flexure. Tooth morphology and wear patern indicate that
Camarasaurus consumed coarse, fibrous plant material. The tooth
replacement pattern is from back to the front of the jaw as in other
reptiles.
Clarke Cochran, Professor in Political Science Bio: Clarke E. Cochran in Professor in Political Science and Adjunct
Professor, Department of Health Organization Management at Texas
Tech University. He specializes in religion and politics, political
philosophy, and health care policy. Dr. Cochran received his Ph.D.
from Duke University in 1971 and has taught at Texas Tech since
1970. He has won the President's Award for Excellence in Teaching.
His current research interests include religious institutions and
health care policy, Catholic social theory and health care reform,
church and state controversies, and liberalism and religious
participation in politics. Abstact: American Public Policy: An Introduction is an introductory
undergraduate text that engages students' interest with its unique
emphasis on specific, substantive issues of public policy. This text
analyzes American public policies in a historical context that
allows students to evaluate, analyze, and debate whether established
policies are successful or if alternative policies could better
serve the American public. The discussion kindled by American Public
Policy educates students on the practical methods of public policy
analysis while allowing them to apply their knowledge to real life
policies.
Howard Curzer, Professor in Philosophy Bio: Howard J. Curzer received his B.A. and M.A. degrees in
mathematics from Wesleyan University and his Ph.D. in philosophy
from the University of Texas at Austin. He specializes in ancient
philosophy, ethics, and biomedical ethics. His recent publications
include "The Ethics of Embryonic Stem Cell Research" (Journal of
Medicine and Philosophy), and "Admirable Immortality, Dirty Hands,
Ticking Bombs, and Torturing Innocents," (Southern Journal of
Philosophy). He has edited a textbook entitled Ethical Theory and
Moral Problems (Wadsworth, 1999), and is rpesently writing a book
tentaively entitled Aristotle's Virtue Ethics. Abstact: Some interpreters take Aristotle to be presenting an
idealized picture of the virtuous person, but I show that
Aristotle's virtuous person may perform wrong acts not only (1)
involuntarily or (2) under unedurable pressure, but also in more
interesting ways. (3) Sporadically, virtuous people perform
out-of-character wrong acts. (4) People may also have character
flaws small enough that they remain virtuous, but large enough to
allow rare, but predictable, in-character wrong acts. (5) Indeed,
some people are virtuous to a fault. Their Virtues drive them to
excess. (6) In people with some natural virtue and some vices, a
virtue and vice may "overlap." If the vice dominates, the person may
frequently act wrongly, even though the virtue remains intact. (7)
Finally, in unusual moral dilemma situations the sort of act that
virtuous people shum is morally required. Some Aristotelian virtuous
people may act rightly with dirty hands, but others act admirable
immorally, following their habits and performing virtuous, but wrong
acts.
Purnendu K. Dasgupta, Horn Professor in Chemistry and Biochemistry Abstact: We present a low-pressure,
automated, semi-continuous Gas-Particle Ion Chromatograph to measure soluble
ionogenic gases and soluble ionic constituents of PM2.5. The system utilizes
a short separation column, an isocratic carbonate eluent and post suppressor
CO2 removal. Measured constituents include ammonium, nitrate, and sulfate in
the particle fraction, and nitric acid, sulfur dioxide, and ammonia among
soluble gases. Two independent sampling channels are used. In one channel, a
wet denuder collects soluble gases. In the second channel, following removal
of large particles by a cyclone and soluble gases by a wet denuder, a
hydrophobic filter-based particle collector collects and extracts the
soluble components of PM2.5. The aqueous particle extract is aspirated by a
peristaltic pump onto serial cation and anion preconcentrator columns. Gas
samples are similarly loaded onto another set of serial cation and anion
preconcentrator columns. The cation preconcentrator is eluted with NaOH and
the evolved NH3 is passed across a membrane device whence it diffuses
substantially into a deionized water receptor stream; the conductivity of
the latter provides a measure of NH3 (NH4+). The anion preconcentrator
column(s) are subjected to automated periodic analysis by ion
chromatography. This system provides data every 30 min for both particles
(NO3−, SO42− and NH4+) and gases (HNO3, SO2 and NH3). Gas and particle
extract samples are each collected for 15 min. The analyses of the gas and
particle samples are staggered 15 min apart. The limit of detection (S/N =
3) for NO3−, SO42− and NH4+ are 2.6, 5.3, and 2.1 ng/m3, respectively.
Purnendu K. Dasgupta, Horn Professor in Chemistry and Biochemistry Abstact: Ozone has become the oxidant of choice for water disinfection, especially in large
water treatment facilities. This paper describes a fast and sensitive method
for the determination of ozone content by reaction with photoactivated
chromotropic acid (CA, 4,5-dihydroxynapthalene-2,7-disulfonic acid), which
results in intense chemiluminescence (CL). Freshly ozonated water from a
recirculating ozonizer/reservoir is injected into a carrier stream of
deionized water in the flow-injection mode. This flow mixes with a stream of
photoactivated CA solution in a spiral cell placed directly on top of an
inexpensive miniature (8 mm diameter active area) photomultiplier tube
(PMT). Alkaline CA is photoactivated by passing it through a FEP-Teflon®
coil (residence time ~50 s) wrapped around a 1 W UV lamp emitting at 254 nm;
without photoactivation, the signal is ~70-fold lower. The S/N = 3 limit of
detection for aqueous ozone is 3 μg1-1 and good response slope is obtained
up to an ozone concentration of 1.4 mg 1-1, the highest that could be made
in this study. The response obeyed a quadratic equation with r2=0.9984. No
interference from permanganate ion is observed. The proposed system was
applied to the monitoring of ozonation status of a playa lake water that
exhibited significant ozone demand.
Purnendu K. Dasgupta, Horn Professor in Chemistry and Biochemistry Abstact: Approximately one-third of the area (14-mm diameter of a 25-mm diameter) of
a 5-μm uniform pore size polycarbonate filter is continuously wetted by a
0.25 mL/min water mist. The water forms a continuous thin film on the filter
and percolates through it. The flowing water substantially reduces the
effective pore size of the filter. At the operational air sampling flow rate
of 1.5 standard liters per minute, such a particle collector (PC)
efficiently captures particles down to very small size. As determined by
fluorescein-tagged NaCl aerosol generated by a vibrating orifice aerosol
generator, the capture efficiency was 97.7+% for particle aerodynamic
diameters ranging from 0.28 to 3.88 μm. Further, 55.3 and 80.3% of 25- and
100-nm (NH4)2SO4 particles generated by size classification with a
differential mobility analyzer were respectively collected by the device.
The PC is integrally coupled with a liquid collection reservoir. The liquid
effluent from the wetted filter collector, bearing the soluble components of
the aerosol, can be continuously collected or periodically withdrawn. The
latter strategy permits the use of a robust syringe pump for the purpose.
Coupled with a PM2.5 cyclone inlet and a membrane-based parallel plate
denuder at the front end and an ion chromatograph at the back end, the PC
readily operated for at least 4-week periods without filter replacement or
any other maintenance.
Purnendu K. Dasgupta, Horn Professor in Chemistry and
Biochemistry Abstact: A light-emitting diode (LED)-based
photometric method for the measurement of gaseous acetone in human
breath is presented. The detection chemistry is based on the
reaction of acetone with alkaline salicyaldehyde to form a colored
product, which absorbs in the blue and can be monitored with
GaN-based LEDs with emission centered at 465 nm. Gaseous acetone in
breath is sampled with a porous membrane based diffusion scrubber
(DS). The collected sample in the continuously flowing water carrier
reacts with the reagent solution. We have used two approaches to
collect breath acetone: the use of a face mask and a Mylar balloon
as a collective bag. With the face mask approach, the expired air
can be measured over long periods without major subject discomfort,
balloon collection (51) permits four measurements from a single
fill. The LED-based liquid core waveguide (LCW) absorbance detector
utilized sapphire ball lenses to prevent exposure of other optical
components to a hot alkaline reagent solution. The high refractive
index of the final mixture permitted the use of an inexpensive
fluorinated ethylene copolymer (FEP Teflon®) tube as a 10 cm long
LCW. The limit of detection (S/N=3) is 14 ppbv gaseous acetone, and
the linear range extends to 1.21 ppmv. The concentration range in 11
volunteer subjects ranged from 176 to 518 ppbv.
2005 Environmental Science & Technology Science Paper of the Year
Purnendu K. Dasgupta, Horn Professor in Chemistry and Biochemistry Abstact:
Perchlorate (ClO4-) competitively inhibits the uptake of iodide by the
thyroid gland. Trace quantities of perchlorate are being increasingly
detected in food and environmental samples. There is great concern that
perchlorate contamination may be far more widespread than believed until
now. Increasingly sensitive and unambiguous methods are needed for measuring
perchlorate. We report here an ion chromatography-ion
association-electrospray ionization-mass spectrometry (IC/IA-ESI-MS) method
of substantially greater selectivity and sensitivity than other available
single-stage MS approaches. A long chain dipositive cationic agent (D2+) is
added postcolumn in low concentration. This ion associates with perchlorate,
even in the gas phase. Perchlorate is, thus, detected as DClO4+ in the
positive ion mode at an m/z value between 300 and 400 (depending on the
choice of D2+). This results in much better S/N and selectivity, as compared
to detecting 35ClO4- at m/z 99, where H34SO4- also responds. We show results
for various dicationic agents which vary in their selectivity and affinity
for ClO4-, typically being at least 1 order of magnitude more selective for
ClO4- over HSO4-. For a 100-μL injected standard, limits of detection (LOD,
S/N = 3) are as good as 25 ng/L on a single quadrupole mass spectrometer.
Calibration for concentrations up to 100 μg/L displays an r2 value of
Co-author, and PhD student in Dasgupta's Research Group, P. Kalyani
Martinelango received Award of Excellence from the American Chemical Society
for recognition of work done as a graduate student.
Purnendu K. Dasgupta, Horn Professor in Chemistry and Biochemistry Abstact: The measurement of atmospheric formaldehyde
has been of interest to the corresponding author for the last two
decades. The initial approach based on the Hantzsch reaction with
2,4-pentanedione (PD) and ammonium acetate was later abandoned in
favor of 1,3-cyclohexanedione (CHD) as the β-diketone because of an
order of magnitude better limits of detection (LOD). Subsequently,
it was discovered that at very high H2O2 to HCHO ratios, the CHD
chemistry has a perceptible positive interference from H2O2. In
this paper, we review techniques for the rationale to return to
PD-based chemistry, and show that nearly equivalent LODs (16 nM
aqueous, 3 pmol, 70 pptv gaseous) can be obtained with reagent
components that are separated rather than a single mixed reagent in
combination with a fluorescence detector that utilizes multiple high
intensity light emitting diodes (LEDs) for excitation without the
benefit of a Teflon AF based waveguide, the use of which has become
more difficult due to legal restrictions. We present design and
construction details of both a ground-based instrument and an
instrument intended for aircraft use and provide illustrative field
data for both.
Purnendu K. Dasgupta, Horn Professor in Chemistry and Biochemistry Abstact: Perchlorate, an iodide uptake inhibitor, is
increasingly being detected in new places and new matrices.
Perchlorate contamination has been attributed largely to the
manufacture and use of ammonium perchlorate (the oxidizer in solid
fuel rockets) and/or the earlier use of Chilean fertilizer sources.
The occurrence of easily measurable concentrations or perchlorate in
such places is difficult to understand. In the southern high plains
groundwater, perchlorate is better correlated with iodate, known to
be of atmospheric origin, compared to any other species. We show
that perchlorate is readily formed by a variety of simulated
atmospheric processes. For example, it is formed from chloride
aerosol by electrical discharge and by exposing aqueous chloride to
high concentrations of ozone. We report that perchlorate is present
in many rain and snow samples. This strongly suggests that some
perchlorate is formed in the atmosphere and a natural perchlorate
background of atmospheric origin should exist.
Purnendu K. Dasgupta, Horn Professor in Chemistry and Biochemistry Abstact:
Perchlorate inhibits iodide uptake and may impair thyroid and
neurodevelopment in infants. Recently, we unambiguously identified
the presence of perchlorate in all seven brands of dairy milk
randomly purchased from grocery stores in Lubbock, TX. How
widespread is perchlorate in milk? Perchlorate in 47 dairy milk
samples from 11 states and in 36 human milk samples from 18 states
were measured. Iodide was also measured in a number of the samples.
Perchlorate was detectable in 81 of 82 samples. The dairy and breast
milk means were, respectively, 2.0 and 10.5 μg/L with the
corresponding maximum values of 11 and 92 μg/L. Perchlorate is
present in virtually all milk samples, the average concentration in
breast milk is five times higher than in dairy milk. Although the
number of available measurements are few at this point, for breast
milk samples with a perchlorate content greater than 10 μg/L, the
iodide content is linearly correlated with the inverse of the
perchlorate concentration with a r2 of >0.9 (n = 6). The presence of
perchlorate in the milk lowers the iodide content and may impair
thyroid development in infants. On the basis of limited available
data, iodide levels in breast milk may be significantly lower than
it was two decades ago. Recommended iodine intake by pregnant and
lactating women may need to be revised upward. 2nd Most-Accessed
Article, Jan.-June 2005, Environmental Science & Technology
Purnendu K. Dasgupta, Horn Professor in Chemistry and
Biochemistry Bio: Purnendu Dasgupta is a native of India but he has spent
virtually all his life in the US. He has never been quite sure what
to do. In his mother tongue, Bengali, he is a well-published poet
(in various magazines as well as a book). He worked as a
photographer, got a diploma in electrical engineering and finally
fell in love with Analytical Chemistry, getting a PhD (LSU, 1977).
He came to TTU in 1981. Abstact: The determination of perchlorate in complex matrices by ion
chromatography (IC) with an online preconcentration and preelution
technique is discussed. The method was applied to different sample
types containing large concentrations of matrix anions that would
otherwise interfere with analysis via conventional IC. The present
approach was highly effective in removing most of the matrix anions
and was thus resistant to the interferences commonly encountered in
a high ionic strength background. Method performance was evaluated
by analyzing for low-level perchlorate in synthetic high ionic
strength solutions, tissue extracts, and hydroponic nitrate
fertilizer samples. Not only is it easier to practice the present
method compared to USEPA Method 314.0, but for most of these samples
the present approach provided equal to or better recovery of
perchlorate than Method 314.0. With a sample of specific conductance
12,650 μS cm−1, for example, the present method provided a
perchlorate recovery of 101% at the 25 μgL−1 level versus 89% by EPA
Method 314.0. Method detection limits in hydroponic fertilizer
samples with this method (130-190 μg kg-1) are the lowest thus far
reported.
Purnendu K. Dasgupta, Horn Professor in Chemistry and Biochemistry Abstact: Hydride generation to form arsine and in-line preconcentration tne into an alkaline KMnO4 receiver followed by molybdenum blue (MB)
colorimetric determination of the arsenate formed is proposed for the highly
sensitive and separate measurement of total inorganic As and As(III).
Reduction of As to AsH3 is carried out by NaBH4; when the reduction is
carried out at pH 1, all the inorganic As is reduced to AsH3, and when
carried out at pH 7, only As(III) is reduced. Reductions at the two
different pH levels are carried out in two different arsine generators
simultaneously using constant addition of NaBH4 with solenoid pumps. The
AsH3 is collected by individual porous membrane diffusion scrubbers filled
with a stationary solution of KMnO4, and the contents of the two scrubbers
sequentially enter a flow analysis stream. MB is formed by merging with an
ammonium molybdate-ascorbic acid reagent, passing through a heated reactor,
and is then measured by a LED/photodiode-based absorbance detector.
Robustness was confirmed for total As using three types of certified natural
water samples. Speciation analysis data from well water samples analyzed by
this method agree well with HPLC-ICPMS measurements in a different
laboratory. The system has been successfully applied to field measurements
of As(III) and As(V), where levels were significantly below 1 μg/L. For a
20-mL sample, the limits of detection (LODs) for this inexpensive instrument
are 0.3 μg/L for both As(III) and total As. When an 80-mL sample is
analyzed, LODs are 0.07 μg/L As(III) and 0.09 μg/L total As. The general
approach should be applicable to many other analyte species of interest that
can be isolated from the matrix by the formation of a suitable volatile
compound that can be recaptured.
Purnendu K. Dasgupta, Horn Professor in Chemistry and Biochemistry Abstact: First, we briefly review the atmospheric chemistry and previous
intercomparison measurements for HCHO, with special reference to the
diffusion scrubber Hantzsch reaction based fluorescence instrument used in
the field studies reported herein. Then we discuss summertime HCHO levels in
five major U.S. cities measured over 1999-2002, primarily from ground-based
measurements. Land-sea breeze circulations play a major role in observed
concentrations in coastal cities. Very high HCHO peak mixing ratios were
observed in Houston (>47 ppb) where the overall median mixing ratio was 3.3
ppb; the corre sponding values in Atlanta were ~>18 and 7.9 ppb,
respectively. The peak and median mixing ratios (9.3 and 2.3 ppb) were the
lowest for Tampa, where the land-sea breeze also played an important role.
In several cities, replicate HCHO measurements were made by direct
spectroscopic instruments; the instruments were located kilometers from each
other and addressed very different heights (e.g., 106 vs 10 m). Even under
these conditions, there was remarkable qualitative and often quantitative
agreement between the different instruments, when they were all sampling the
same air mass within a short period of each other. Local chemistry dominates
how HCHO is formed and dissipated. The high concentrations in Houston
resulted from emissions near the ship channel; the same formaldehyde plume
was measured at two sites and clearly ranged over tens of kilometers. Local
micrometeorology is another factor. HCHO patterns measured at a high-rise
site in downtown Nashville were very much in synchrony with other ground
sites 12 km away until July 4 celebrations whence HCHO concentrations at the
downtown site remained elevated for several days and nights. The formation
and dissipation of HCHO in the different cities are discussed in terms of
other concurrently measured species and meteorological vectors. The vertical
profiles of HCHO in and around Tampa under several different atmospheric
conditions are presented. The extensive data set represented in this paper
underscores that urban HCHO measurements can now be made easily; the
agreement between disparate instruments (that are independently calibrated
or rely on the absolute absorption cross section) further indicates that
such measurements can be done reliably and accurately for this very
important atmospheric species. The data set presented here can be used as a
benchmark for future measurements if the use of formaldehyde precursors such
as methanol or methyl tert-butyl ether (MTBE) as oxygenated fuel additives
increases in the future.
Philip A. Dennis, Professor in Anthropology
Bio: Philip A. Dennis has taught anthropology at Tech since 1974. He
has done fieldwork in Mexico, Guatemala, and Nicaragua, and is the
author of The Miskitu People of Awastara (UT Press, 2004). Along
with other anthropological faculty, he teaches "Understanding
Multicultural America."
Abstact: A unique introductory anthropology course at Texas Tech
University introduces students to cultural diversity in the United
States. Student read etnographies--fieldwork-based descriptions of
Hispanic, African American, and other communities--and then do
ethnographic research of their own in the local community. This
popular course encourages students to develop intersubjectivity:
understanding others by entering into cultural worlds, if only
briefly. "Investor Responses to IMF Program Suspensions: Is Noncompliance Costly?" Martin Edwards, Assistant Professor in Political Science Bio: Martin S. Edwards specializes in international relations, with
a focus on international political economy and international
institutions. Professor Edwards received his Ph.D. from Rutgers
University in 2003 and has taught at Texas Tech since 2002. Edwards
is the recipient of teaching awards from both the Department of
Housing and Residence Life and the American Political Science
Association. Abstact: This article reinvestigates the "catalytic " effect of IMF
programs on investment controlling for the implementation of the
program. I find mixed evidence that good implementation fails to
slow capital flight. I find consistently strong evidence that failed
Fund programs produce capital flight. The findings suggest that we
should think about the Fund 's influence (both positive and
negative) in light of how capital markets respond to its signals.
Carol Fitzgerald Flueckiger, Assistant Professor of Art Bio: Circa Gallery in Minneapolis represents my work. In 2002 I was
featured in a solo show titled Shaded & Clear and I will be included
in a two-person exhibit for fall 2006. For over a decade my work has
been accepted in juried and invitational exhibitions. In 2000 I
received an Art in Public Spaces Award from the University of New
Mexico and in 2004 I was nominated for the Texas Prize, a $30,000
award given by Arthouse at the Jones Center in Austin, Texas.
Abstact: This work is informed by Elizabeth Cady Stanton's 19th
Century speech "The Declaration of Sentiments" delivered at the
first women's rights conference in the world. I collaborate with
nature to create my images by laying transparencies of text onto
wood panels that have been treated with cyanotype, an early
photographic process, and then exposing the coated panels to the
burning Texas sun. The opposite sides of the blocks are imprinted
with horse chestnut leaves gathered from a tree outside of her
historic home. The tree dates back to the time when she wrote the
speech.>
Edward George, Professor in Classical and Modern Languages
and Literature, Emeritus Bio: Edward V. George (Ph.D., Classics, Wisconsin), Professor
Emeritus, served as Graduate Advisor in the Classics MA program. He
has worked with teachers on material bridging between Latin and
Spanish, and between Roman Culture and Hispanic America. He is a
former Vice President of the American Clasical League, and the
Immediate Past President of the American Association for Neo-Latin
Studies. He has written extensively on Juan Luis Vives, the 16th
century Spanish humanist and Latinist. Abstact: Columbus’s First Voyage, co-edited by Constance P. Iacona
and Edward V. George, contains illustrated excerpts from Peter
Martyr’s Latin De Orbe Novo, or On the New World (1493 & ff.),
narrating Columbus’s first transatlantic voyage, with Introduction,
grammatical and historical notes, practice sentences, and glossary,
suitable for use in intermediate level Latin classes. Latin programs
usually start by assuming that practically all Latin writings which
deserve attention come from the two centuries before and after the
birth of Christ. We offer this volume as vivid proof that engaging
and important writings can be found far beyond those conventional
chronological boundaries.
Kent Griffin, Instructor in Health, Exercise and Sport Sciences
Bio: Kent Griffin is an instructor in Health, Exercise and Sport
Sciences. In addition to teaching in the department Kent is also the
coordinator of the Personal Fitness and Wellness Program. Kent is
currently a Doctoral student in the College of Education and hopes
to earn his degree in May 2007. Kents research interests are in
curriculum and instruction in physical education.
Abstact: This investigation examined the effect of model similarity
on girls ' acquisition, retention, transfer, and transfer strategies
of a novel motor task. Forty girls (mean age = 10 years) were
randomly assigned to conditions in a 2 (model skill level) X 2
(model sex) factorial design using four treatment groups: (a) male
skilled, (b) male learning, (c) female skilled, and (d) female
learning. Quantitative data revelaed that participants observing a
female model or a learning model transferred significanlty more
learning strategies than did participants observing a male or
skilled model. Qualitative results underscored the need to include
models of similar sex, as well as learning models when instructing
girls in motor skills. "Broken Covenants and the American
Pantheon: Church and State 25 Years after The Political Pulpit" in The
Political Pulpit Revisited" Mark Gring, Assistant Professor in Communication Studies
Bio: Mark Gring grew up as the child of missionary parents in
Guatemala and El Salvador, earned his PhD at The Ohio State
University in 1993, and teaches rhetorical theory and persuasion in
the department of Communication Studies at Texas Tech University.
His research focuses on the study of ideology, rhetorical
epistemology, and the influence of religious argument on
sociopolitical change. His recent work analyzes the religious
arguments in post 9-11 sermons.
Abstact: This essay contends that Roderick Hart s (1977) rhetorical
contract between church and state never existed and, instead, he
discovered a statist religion with its own discourse. This statist
religious perspective opposes the covenantal religious perspective
that characterizes Judeo-Christianity and the early American
understanding of church and state relations. Current church and
state relations in the United States, then, are characterized by the
conflict that pits the statist religion against historic
Judeo-Christianity. The paper concludes that the U.S. church must
regain its covenantal perspective before it has substantive
solutions to offer to a country that teeters on the edge of
totalitarianism. "The Poincaré Metric and Isoperimetric
Inequalties for Hyperbolic Polygons," Transactions of the American
Mathematical Society, Vol. 357 No. 10: 3905-3932 Petros Hadjicostas, Assistant Professor in Mathematics Bio: Petros Hadjicostas received a B.S. and a M.S.
from the Department of Mathematics at Carnegie Mellon University,
and a M.S. and a Ph.D. from the Department of Statistics of the same
university. He has taught at the University of Cyprus and at SUNY
College at Brockport. Dr. Hadjicostas came to Texas Tech
University in 2001, where he is currently an Assistant Professor.
His research interests in Statistics are Bayesian Statistics,
Logistic Regression, and Simpson's Paradox. In addition, his
research interests in Mathematics include (among others)
isoperimetric inequalities in hyperbolic geometry, analysis of
sorting algorithms, and production theory.
Abstact: "We prove several isoperimetric inequalities for the
conformal radius (or equivalently for the Poincaré density) of
polygons on the hyperbolic plane. Our results include, as limit
cases, the isoperimetric inequality for the conformal radius of
Euclidean $n$-gons conjectured by G. Pólya and G. Szegö in 1951 and
a similar inequality for the hyperbolic $n$-gons of the maximal
hyperbolic area conjectured by J. Hersch. Both conjectures have been
proved in previous papers by the third author." "Our approach uses the method based
on a special triangulation of polygons and weighted inequalities for the reduced
modules of trilaterals developed by A. Yu. Solynin. We also employ the
dissymmetrization transformation of V. N. Dubinin. As an important part of our
proofs, we obtain monotonicity and convexity results for special combinations of
the Euler gamma functions, which appear to have a significant interest in their
own right."
Melanie Hart, Assistant Professor in Health, Exercise, and
Sports Sciences
Bio: Dr. Melanie A. Hart is an Assistant Professor in the Department
of Health, Exercise and Sport Sciences. Her teaching assignment is
predominately in the area of graduate and undergraduate physical
education and sport pedagogy. Dr. Hart is involved in theoretical
and applied research examining various factors, such as attention
and the use of strategies that influence the learning of motor
skills. "Marguerite, Countess of Blessington,
Victims of Society (1837)," Silver Fork Novels, 1826-1841, vol. 4 Ann R. Hawkins, Assistant Professor in English
Bio: Ann R. Hawkins specializes in Bibliography, Book History, and
Textual Studies. She has published scholarly editions of three
nineteenth-century novels as well as articles on Disraeli, Byron,
the British book trade and women writers. Hawkins was a 2004 New
Scholar by the Bibliographical Society of America, and she has held
fellowships from the National Endowment for the Humanities, the
Bibliographical Society of America, the Folger Shakespeare Library,
and University of Virginia s Rare Book School. Abstact: Best known today for her "Conversations with Lord Byron, "
Marguerite Gardiner, Countess of Blessington was in her day a
publishing phenomenon, earning more than 2000 per annum from her
writing alone--a figure making her the most highly paid woman writer
of her generation. This edition--with introduction, extensive
bibliographies, textual notes, and annotations--is the first
appearance of one of Blessington 's novels in print since the end of
the nineteenth-century. Giving an insider view of London high life,
_Victims of Society_ (1837) addresses hypocrisy of a society where
one s virtue is determined by one s reputation, not one s personal
morality.
Ann R. Hawkins, Assistant Professor in English Abstact: This article examines Marguerite Gardiner, Countess of
Blessington's savvy marketing of her poetry series "Gems of Beauty"
(1836-40).The article focuses of the 1836 issue of "Gems", placing
that text in the context of Blessington's other giftbooks,
specifically the 1835 "Flowers of Loveliness" developed for
Ackermann and Co. In addition to examining the type of woman that
Blessington's poems create, the article considers how the poetry,
physical characteristics of the volume and its illustrations create
a unified marketing product. Ultimately the article addresses the
volume's versions of gender and natiionalism and their place in
nineteenth-century women's book market. "Conserving the Diaries of Dr. Đặng Thùy Trâm" Sara Holmes, Assistant Archivist and Conservator for Special Collections Bio: Sara Holmes is Conservator for Special
Collections and heads the Hoblitzelle Conservation Lab in the
University Libraries. She received her M.L.S. and a Certificate of
Advanced Study in Conservation of Library and Archival Materials
from the University of Texas. She is also a certified archivist and
has previously treated documents and materials ranging from court
suits filed by slaves in bids to secure their freedom to the
personal papers and notebooks of UT Tower sniper Charles Whitman.
Abstact: The diaries of Dr. Đặng Thùy Trâm were originally recovered
and kept by American G.I. Frederick Whitehurst during the Vietnam
War. Donated to the Vietnam Archive in 2005, the diaries required
reattachment of boards and a few leaves. Most challenging was the
design of an archival housing using appropriate materials that would
meet the needs of preserving the books while honoring Dr. Trâm’s
memory at the same time. Adapting Asian-styled book case traditions
to the needs of the diaries, a single box was created to house both
volumes as well as a small portfolio made to house the paper-cut
stencil found inside one of the diaries. "Digital Alloys of AlN/AlGaN for Deep UV
Light Emitting Diodes" Mark Holtz, Professor in Physics Abstract: We report a systematic study of the optical and
electrical properties of deep ultraviolet light emitting diodes
based on digital alloy structures of AlN/Al0.08Ga0.92N grown by gas
source molecular beam epitaxy with ammonia. Digital alloys are
formed by short period superlattices consisting of Al0.08Ga0.92N
wells, 0.50 or 0.75 nm thick, and AlN barriers, 0.75 to 1.5 nm
thick. For digital alloys with effective bandgap of 5.1 eV, average
AlN composition 72%, we obtain room temperature electron
concentrations up to 1× 1019 cm-3 and resistivity of 0.005 Ω·cm and
hole concentrations of 1× 1018 cm-3 with resistivity of 6 Ω·cm.
Light emitting diodes based on digital alloys are demonstrated
operating in the range of 250 to 290 nm. |
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University Library
FACE 2006
2006 Entries- Arts and Sciences
"The Origin of Naturally Occurring Perchlorate: The Role of
Atmospheric Processes"
g/kg of
FW)/
"Economic Reforms and Inflows of
Foreign Direct Investment in Latin America"
"Swinging the Vernacular: Jazz and African American Modernist
Literature"
"Voices from Vietnam: Eye-witness
Accounts of the War, 1954-1975"
"Deep Time and the Texas High Plains:
History & Geology"
"Market Matters: Applied Rhetoric
Studies and Free Market Competition"
"'Neuroanatomy and Dentition of
Camarasaurus lentus' in Thunder-Lizards: The Sauropodomorph Dinosaurs"
"American Public Policy: An
Introduction, Eighth Edition"
"How Good People Do Bad Things:
Aristotle on the Misdeeds of the Virtuous," Oxford Studies in Ancient
Philosophy, vol 28 (Summer 2005): 233-256
"Automated Low Pressure Carbonate Eluent
Ion Chromatography System with Postsuppressor Carbon Dioxide Removal for the
Analysis of Atmospheric Gases and Particles," Aerosol Science and
Technology, Vol. 39 No. 11, November 2005: 1072-1084
"Determination of Acetone in Breath,"
Analytica Chimica Acta, 535 (2005): 189-199.
0.9993.
We show applicability to various real samples. A number of the studied
reagents are suitable for such applications.
"The Origin of Naturally
Occurring Perchlorate: The Role of Atmospheric Processes," Environmental
Science & Technology, 39 (2005): 1569-1575
"Anthropology 1301:
Understanding Multicultural America," College Teaching, vol. 53 no. 2
(Spring 2005): 65-70
"Declaration
of Sentiments and Horse Chestnut Leaves"
"Columbus' First Voyage: Latin
Selections from Peter Martyr's De Orbe Novo"
"The Effect of Model Similarity on
Girls' Motor Performance," Journal of Teaching in Physical Education, 24
(2), April 2005 
"The Effect of Model Similarity on Girls' Motor Performance,"
Journal of Teaching in Physical Education, 24 (2): April 2005
"Marketing Gender and Nationalism:
Blessington's Gems of Beauty/L 'Écrin and the Mid-Century Book Trade," Women
's Writing, 12.2 (2005): 225-241