Physical Sciences and Mathematics Commons^™

The Combined Effects Of Salinity And Sulfide On The Growth And Physiology Of The Freshwater Marsh Plant Pancium Hemitomon J.A. Schultes, James Wesley Pahl

LSU Doctoral Dissertations

Vegetative response to saltwater intrusion into coastal freshwater wetlands is governed by the combined effects of increased salinity and porewater sulfide concentrations. I conducted a series of experiments to address the primary hypothesis that growth of Panicum hemitomon is adversely affected by an interaction between salinity and sulfide stresses associated with saltwater intrusion, and the mechanisms for decreased growth are alterations in the metabolic and morphological adaptations needed for a plant to survive in a flooded environment. I exposed marsh sods to a factorial treatment arrangement of three salinities (0, 2, and 4 ppt) and three porewater sulfide concentrations (0, …

A Comparison Of Various Methods For The Preparation Of Polystyrene And Poly(Methyl Methacrylate) Nanocomposites, Dongyan Wang, Jin Zhu, Qiang Yao, Charles A. Wilkie

Chemistry Faculty Research and Publications

Polymer−clay nanocomposites of styrene and methyl methacrylate have been prepared by bulk, solution, suspension, and emulsion polymerization as well as by melt blending. Two different organic modifications of montmorillonite have been used:  one contains a styryl monomer on the ammonium ion while the other has no double bond. The organic modification as well as the mode of preparation determines if the material will be exfoliated or intercalated. Exfoliation is more likely to occur if the ammonium ion contains a double bond which can participate in the polymerization reaction, but the mere presence of this double bond is not sufficient to …

Fire Retardant Halogen-Antimony-Clay Synergism In Polypropylene Layered Silicate Nanocomposites, Marco Zanetti, Giovanni Camino, Domenico Canavese, Alexander B. Morgan, Frank K. Lamelas, Charles A. Wilkie

Chemistry Faculty Research and Publications

Nanocomposites of polypropylene-graft-maleic anhydride with organically modified clays have been prepared and characterized by X-ray diffraction and transmission electron microscopy. Their combustion behavior has been evaluated using oxygen consumption cone calorimetry. Synergy is observed between the nanocomposite formed and conventional vapor phase fire retardants, such as the combination of decabromodiphenyloxide and antimony oxide. The presence of bromine and antimony does not affect the heat release rate curves of the virgin polymer.

Transverse Group Actions On Bundles, Ian M. Anderson, Mark E. Fels

Mathematics and Statistics Faculty Publications

An action of a Lie group G on a bundle is said to be transverse if it is projectable and if the orbits of G on E are diffeomorphic under π to the orbits of G on M. Transverse group actions on bundles are completely classified in terms of the pullback bundle construction for G-invariant maps. This classification result is used to give a full characterization of the G invariant sections of E for projectable group actions.

Silicon-Methoxide-Modified Clays And Their Polystyrene Nanocomposites, Jin Zhu, Paul Start, Kenneth A. Mauritz, Charles A. Wilkie

Chemistry Faculty Research and Publications

Silicon-methoxide-containing modified clays were obtained through cationic exchange between the sodium clay and the ammoniumcation of [3-(trimethoxysilyl) propyl]octadecyldimethylammoniumchloride (Si18). The nanocomposites were prepared through bulk polymerization of styrene in which the Si18 clay was dispersed. The silicon-methoxide offers the possibility of reaction between the methoxide and a clay hydroxyl group to link together the cation and the clay. The nanocomposites were characterized by X-ray diffraction, transmission electron microscopy, and atomic force microscopy. Their thermal stability and flame retardancy were measured by thermogravimetric analysis (TGA) and cone calorimetry. Linkage between the silicon and the clay apparently occurs in the clay but …

Effect Of Temperature On The Development Of Orius Albidipennis Reuter, A Predator Of The African Legume Flower Thrips, Megalurothrips Sjostedti Trybom, L. M. Gitonga, B. Löhr, W. A. Overholt, J. K. Magambo, J. M. Mueke

All Peer-Reviewed Publications

The effects of temperature on the development of Orius albidipennis (Reuter) (Hemiptera: Anthocoridae), reared on its prey, Megalurothrips sjostedti (Trybom) (Thysanoptera: Thripidae), were studied in the laboratory. Nymphal mortality was 87, 48 and 38% at 20, 25 and 30 °C, respectively. With the exception of first-instar nymphs, percentage mortality was lowest at 25 °C. Pre-oviposition period and longevity decreased with an increase in temperature. Mean daily and total fecundity were 2.1 and 76.4 respectively at 25 °C. The mean developmental period from oviposition to adult eclosion was 27.7, 14.1 and 10.9 days at 20, 25 and 30 °C respectively. There …

An Xps Investigation Of Thermal Degradation And Charring Of Pmma Clay Nanocomposites, Jianxin Du, Jin Zhu, Charles A. Wilkie, Jiangqi Wang

Chemistry Faculty Research and Publications

Poly(methyl methacrylate)–clay nanocomposites have been studied using X-ray photoelectron spectroscopy. It is clear that as the polymer undergoes thermal degradation, the clay accumulates at the surface and the barrier properties which result from this clay accumulation have been described as the reason for the decreased heat release rate for nanocomposites. The surface composition of the clay changes as the nanocomposite is heated and the changes are affected by the organic-modification that were applied to the clay in order to prepare the nanocomposite.

Wiyn Open Cluster Study Xi: Wiyn1 3.5m Deep Photometry Of M35 (Ngc 2168), Ted Von Hippel, Aaron Steinhauer, Ata Sarajedini, Constantine P. Deliyannis

Publications

We present deep BV I observations of the core of M35 and a nearby comparison field obtained at the WIYN 3.5m telescope under excellent seeing conditions. These observations probe to V > 26, and display the lower main sequence in BV and V I CMDs down to V = 23.3 and 24.6, respectively. At these faint magnitudes the background Galactic field stars are far more numerous than the cluster stars, yet by using a smoothing technique and CMD density distribution subtraction we are able to recover the cluster fiducial main sequence and luminosity function to V = 24.6. We find the …

Book Review: Flash!: The Hunt For The Biggest Explosions In The Universe, T. D. Oswalt

Publications

This document is Dr. Oswalt’s review of Flash! : the hunt for the biggest explosions in the universe by Govert Schilling. tr. by Naomi Greenberg-Slovin Cambridge, 2002 291p, 0-521-80053-6 $28.00

Book Review: The Observing Guide To The Messier Marathon: A Handbook And Atlas, T. D. Oswalt

Publications

This document is Dr. Oswalt’s review of The Observing Guide to the Messier Marathon : a Handbook and Atlas by Don Machholz. Cambridge, 2002 157p, 0-521-80386-1 $25.00.

Fact Sheet, Yale Office Of Institutional Research

Fact Sheets

No abstract provided.

Circulation, Vol. 8, No. 3, Center For Coastal Physical Oceanography, Old Dominion University, Arnoldo Valle-Levinson

CCPO Circulation

Winter 2002 issue of CCPO Circulation featuring article "High School Students Learn by Direct Experiences on the Effects of Recent Drought on the Water Properties of a Subtributary to the Chesapeake Bay" by Arnoldo Valle-Levinson

Response Of Anchovy (Engaulis Ringens) Off Northern Chile To The 1997-1999 El Niño-La Niña Sequence, José L. Blanco, Patricio Barria, Jorge Castillo, Larry P. Atkinson

CCPO Publications

No abstract provided.

Wintertime Shoreward Near-Surface Currents South Of Cape Hatteras, Dana K. Savidge

CCPO Publications

[1] Cross-isobath flow on continental shelves is of interest for a variety of reasons. Near Cape Hatteras, North Carolina, the transport of larval organisms, pollutants, and oceanic carbon budget constituents to and from the adjacent Albemarle and Pamlico Sounds may depend critically on cross-isobath currents. Shoreward currents in the near-surface waters south of Cape Hatteras are documented herein, on the basis of continuous 2-year time series, encompassing all or part of three consecutive winters. Energetic shoreward currents exist similar to30% of the time from midfall through late spring. These currents are evident over the 20 and 35 m isobaths along …

Variation In The Position Of The Upwelling Front On The Oregon Shelf, Jay A. Austin, John A. Barth

CCPO Publications

As part of an experiment to study wind-driven coastal circulation, 17 hydrographic surveys of the middle to inner shelf region off the coast of Newport, OR (44.65°N, from roughly the 90 m isobath to the 10 m isobath) were performed during Summer 1999 with a small, towed, undulating vehicle. The cross-shelf survey data were combined with data from several other surveys at the same latitude to study the relationship between upwelling intensity and wind stress field. A measure of upwelling intensity based on the position of the permanent pycnocline is developed. This measure is designed so as to be insensitive …

Hydrographic Conditions Off Northern Chile During The 1996-1998 La Niña And El Niño Events, Jose Luis Blanco, Mary-Elena Carr, Andrew C. Thomas, P. Ted Strub

CCPO Publications

The evolution of oceanographic conditions in the upwelling region off northern Chile (18°-24°S) between 1996 and 1998 (including the 1997-1998 El Niño) is presented using hydrographic measurements acquired on quarterly cruises of the Chilean Fisheries Institute, with sea surface temperature (SST), sea level, and wind speeds from Arica (18.5°S), Iquique (20.5°S), and Antofagasta (23.5°S) and a time series of vertical temperature profiles off Iquique. Spatial patterns of sea surface temperature and salinity from May 1996 to March 1997 followed a normal seasonal progression, though conditions were anomalously cool and fresh. Starting in March 1997, positive anomalies in sea level and …

University Of Texas At Tyler Catalog, 2002-2004, University Of Texas At Tyler

Catalogs

Archives Space instance: https://archivesspace.uttyler.edu/repositories/2/archival_objects/22361

Impact Spherules From Western Australia: A Textural Analysis Of Really Old Tiny Rocks, Dawn C.S. Ruth

Honors Papers

The fourth shale macroband of the Dales Gorge Member of the Brockman Iron Formation in the Hamersley Basin in Western Australia contains a 2.49 billion years-old impact ejecta layer (Hassler and Simonson,2001). The S4 layer is the least studied Paleoproterozoic impact layer in the Hamersley Basin. It displays textures and replacement minerals not seen in other layers. Analysis of this layer will help our understanding of the processes that form impact ejecta, especially in the Paleoproterozoic.

It is believed that these ejecta settled in a deep basin environment; laterally extensive beds and mud-sized grains are evidence of the deep basin …

Quantifying Potential Urban Landscape Water Conservation Through Billing Data Analysis In Layton, Utah, Roger Kjelgren, Fayek A. Farag, Christopher M. U. Neale, Joanna Endter-Wada, Judith Kurtzman

Environment and Society Faculty Publications

No abstract provided.

Linking Ethiopian And Kenyan Pastoralists & Strengthening Cross-Border Collaboration, D. Layne Coppock, Solomon Desta

Environment and Society Faculty Publications

No abstract provided.

Bond Rating Of Upgrades And Downgrades : The Impact On Stock Returns, C. Thaneswary Chelliah

Student Works (2000-2009)

This paper examines the share market reactions to bond rating changes of upgrades and downgrades. In term of analysis the upgrade and the downgrade category has been divided into changes based on the investment and speculative groups. The market model was used in determining abnormal returns for the study. This research provides the relation of changes taken place within the group and across the group. In addition, this paper is also examining the impact of rating changes due to financial prospect and the companies' leverage. All the analysis is based in Malaysian scenario . The result suggests that there were …

Internet Usage Among Medical Doctors In Malaysia, Surendran Jaganathan

Student Works (2000-2009)

In Malaysia, there were 20,000 Internet subscribers in 1996, 1.5 Million in 2000 and it is predicted to reach 4.5 Million in 2004. Malaysia is experiencing an explosive growth of Internet users. There is also a growing importance of "e -health businesses" as shown in the existing 20,000 healthcare sites currently online with an additional 1,500 sites being added every month. This translates to increasing healthcare site users for instance in America alone, out of 11 o million Internet users, 70 million searched the Web for health information. For healthcare consumers worldwide, the Internet has now become a tool for …

An Exploratory Study Of Internet Data Centres In Malaysia, Huai Peng Loh, Siew Hwa Tan

Student Works (2000-2009)

The explosion of Internet in Malaysia has spurred the growth of Internet Data Centres - a combination of Internet Service Providers, Information Technology Vendor Community and Telecommunication Service Providers providing co­location and managed services. These Internet Data Centres are targeting any organisations which have an internet strategy and which plan to outsource their IT infrastructures. This report aims to shed a light on the Malaysian Internet Data Centres, which are mainly concentrated in the Klang Valley. Readers will be able to gain insight into the target markets, infrastructure owned and services offered by the Internet Data Centres concerned. The report …

An Analytical Hierarchy Process (Ahp) Assessment Of The Iso 14001-Based Environmental Management System In The Oil And Gas Industry In Malaysia, Vijayalakshmi Benjamin Samuel

Student Works (2000-2009)

Today's business world is changing due to the ever-increasing consciousness for environmental protection and sustainable development. Customers are taking into account environmental considerations in their supplier selection, and are increasingly buying products with identifiable environmental attributes. In this study, the critical decision criteria, sub-criteria and benefits of the adoption and implementation of the ISO 14001-based environmental management system (EMS) in the Malaysian oil and gas sector were studied using the analytical hierarchy process (AHP) approach. An empirical study was performed to investigate the relative weights and priorities of these criteria and benefits. An AHP decision model of EMS adoption was …

Supply Chain Management In Manufacturing Industry : A Study Of The Implementation Strategy Of Xyz Technology (M) Sdn. Bhd., Tiong Fock Poh

Student Works (2000-2009)

Advancement of technology and globalization pressure cause a lot of companies seek for a better manufacturing technology and operation management. One of the latest management tools that become hot topics to overcome this issue is Supply Chain Management. About 50 years ago, Forrester (1958) introduced a new theory of cross function management, but it was not been given much attention until last 10 years. Supply chain is not something new to the operation management. The differences of Forrester theory is the synergy of all operation management to get a dynamics and better result that is why the word of "management" …

Total Kindergarten Management System, Burkhan Halida

Student Works (2000-2009)

Sistem maklumat dan penggunaan komputer adalah dua perkara penting yang menjadi teras bagi semua organisasi. Menyedari keadaan ini, pihak kerajaan telah membangunkan projek MSC atau Multimedia Super Corridor. Projek mega ini bertujuan untuk menjadikan Malaysia pusat teknologi dan telekomunikasi menjelang 2020 nanati. MSC diharapkan akan melancarkan lagi penggunaan teknologi berciri IT. Terdapat 7 teraju utama dalam projek mega MSC dan Smart School atau Sekolah Bistari adalah salah satu daripadanya. Sistem Pengurusan Tadika ini dibina selaras untuk manyahut langkah kerajaan. Walaupun apa yang dimaksudkan sebagai Sekolah Bistari adalah bermula dengan sekolah rendah, tetapi dengan terbinanya sistem ini dapat membuktikan bahawa pihak …

Ujian Berelektronik Sistem Pengskoran Dan Pengredan Ujian Berelektronik, Abu Arpah

Student Works (2000-2009)

Sistem Pengskoran dan Pengredan Ujian Berelektronik (SPPUB) adalah projek Latihan Ilmiah Tahap Akhir I. Ia merupakan kursus yang wajib diambil oleh pelajar di Fakulti Sains Komputer & Teknologi Maklumat, Universiti Malaya. SPPUB merupakan sub-sistem yang akan diintegrasikan dengan Sistem Ujian Berelektronik. tanya digunakan di dalam proses-proses penyemakan jawapan dan pemarkahan ujian, dimana proses-proses tersebut dapat dijalankan dengan segera dan salah satu altematif untuk menjimatkan kos kertas dan masa. Ia juga membolehkan pihak calon dan pentadbiran memperolehi keputusan ujian dengan segera dan lebih sistematik tanpa memerlukan kepelbagaian dokumen berasaskan kertas. Ciri-ciri yang dimiliki oleh sistem ini adalah ramah pengguna, kesediaadaan, boleh …

Synthetic, Structural, Magnetic, And Mössbauer Spectral Study Of {Fe[Hc(3,5-Me2pz)3]2}I2 And Its Spin-State Crossover Behavior, Daniel L. Reger, Christine A. Little, Mark D. Smith, Arnold L. Rheingold, Kin Chung Lam, Thomas L. Concolino, Gary J. Long, Raphaël P. Hermann, Fernande Grandjean

Chemistry Faculty Research & Creative Works

The complex {Fe [HC(3,5-Me₂pz)₃]₂} I₂ (1) has been prepared from the reaction of FeI₂ and HC(3,5-Me₂pz)₃ (pz = pyrazolyl ring) in a 1:2 ratio. The complex is high spin in both the solid state and in solution at ambient temperature. In the solid state, magnetic susceptibility and Mössbauer spectral studies indicate that samples of the complex that have been crystallized and dried change completely from high-spin to low-spin upon cooling below 195 K, with a substantial two-step thermal hysteresis in the transition. The spin-crossover properties of 1 are sample …

Web-Based Counseling System, Ramasamy Avinash Pratap

Student Works (2000-2009)

As we know that the advancement of information technology and increasing numbers of users getting connected to the internet, different promotional methods are employed on the wold wide web (www). Providing sufficient information, so as to entice to user to visit the property. Effects of the technological developments in the counseling scope and the fruits of applied technology with the main factor of economic force. Profit motives that are always behind the scenes regulating the flows and rates of implementation has shape the relative popularity and growth patterns of competing, usually interdependent and products· Therefore value added services such as …

Laman Web Cahaya Mata, Razali Rinizah

Student Works (2000-2009)

Latihan ilmiah tahap II merupakan syarat keperluan bagi pengijazahan sarjana muda sains komputer. Oleh itu, pembangunan laman web cahaya mata telah dipilih sebagai projek bagi latihan ilmiah tahap II. Dalam menerima kehadiran cahaya mata, pelbagai maklumat, panduan dan ikhtibar berkaitan dengannya perlulah dimiliki untuk menjamin persediaan kehamilan dan kelahiran cahaya mata yang sempurna. Maka dengan ini, Laman web cahaya mata yang mengandungi penduan serta maklumat yang lengkap dibangunkan untuk membimbing para pengguna terutamanya bakal ibu bapa yang akan menimang cahaya mata dan juga kepada para ibu bapa dalam mendidik anak-anak. Selaras dengan perkembangan teknologi komputer dan kemudahan internet yang pesat, …