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Observation Of Hard Scattering In Photoproduction Events With A Large Rapidity Gap At Hera, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, J. Schlereth, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, F. Frasconi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti Mar 1995

Observation Of Hard Scattering In Photoproduction Events With A Large Rapidity Gap At Hera, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, J. Schlereth, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, F. Frasconi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti

Faculty Publications

Events with a large rapidity gap and total transverse energy greater than 5 GeV have been observed in quasi-real photoproduction at HERA with the ZEUS detector. The distribution of these events as a function of the γp centre of mass energy is consistent with diffractive scattering. For total transverse energies above 12 GeV, the hadronic final states show predominantly a two-jet structure with each jet having a transverse energy greater than 4 GeV. For the two-jet events, little energy flow is found outside the jets. This observation is consistent with the hard scattering of a quasi-real photon with a colourless …

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Measurement Of Multiplicity And Momentum Spectra In The Current Fragmentation Region Of The Breit Frame At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Avad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, I. Gialas, P. Giusti, G. Lacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari Mar 1995

Measurement Of Multiplicity And Momentum Spectra In The Current Fragmentation Region Of The Breit Frame At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Avad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, I. Gialas, P. Giusti, G. Lacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari

Faculty Publications

Charged particle production has been measured in Deep Inelastic Scattering (DIS) events using the ZEUS detector over a large range of Q2 from 10 to 1280 GeV2. The evolution with Q of the charged multiplicity and scaled momentum has been investigated in the current fragmentation region of the Breit frame. The data are used to study QCD coherence effects in DIS and are compared with corresponding e+e- data in order to test the universality of quark fragmentation. © 1995 Springer-Verlag.

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Neutral Strange Particle Production In Deep Inelastic Scattering At Hera, M. Derick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz Mar 1995

Neutral Strange Particle Production In Deep Inelastic Scattering At Hera, M. Derick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz

Faculty Publications

This paper presents measurements of K0 and Λ production in neutral current, deep inelastic scattering of 26.7 GeV electrons and 820 GeV protons in the kinematic range 100.04. Average multiplicities for K0 and Λ production are determined for transverse momenta pT>0.5 GeV and pseudorapidities |η|<1.3. The multiplicities favour a stronger strange to light quark suppression in the fragmentation chain than found in e+e- experiments. The production properties of K0' s in events with and without a large rapidity gap with respect to the proton direction are compared. The ratio of neutral K0' s to charged particles per event in the measured kinematic range is, within the present statistics, the same in both samples. © 1995 Springer-Verlag.

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Jet Production In High Q2 Deep-Inelastic Ep Scattering At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Avad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz Mar 1995

Jet Production In High Q2 Deep-Inelastic Ep Scattering At Hera, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Avad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz

Faculty Publications

Two-jet production in deep-inelastic electron-proton scattering has been studied for 160

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Extraction Of The Gluon Density Of The Proton At X, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, J. Schlereth, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, F. Frasconi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti Feb 1995

Extraction Of The Gluon Density Of The Proton At X, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, J. Schlereth, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, F. Frasconi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti

Faculty Publications

The gluon momentum density xg(x, Q2) of the proton was extracted at Q2 = 20 GeV2 for small values of x between 4 × 10-4 and 10-2 from the scaling violations of the proton structure function F2 measured recently by ZEUS in deep inelastic neutral current ep scattering at HERA. The extraction was performed in two ways. Firstly, using a global NLO fit to the ZEUS data on F2 at low x constrained by measurementsfrom NMC at larger x; and secondly using published approximate methods for the solution of the GLAP QCD evolution equations. Consistent results are obtained. A substantial …

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Inclusive Jet Differential Cross Sections In Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, J. Schlereth, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, F. Frasconi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti Jan 1995

Inclusive Jet Differential Cross Sections In Photoproduction At Hera, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, J. Schlereth, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, S. D'Auria, F. Frasconi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti

Faculty Publications

Inclusive jet differential cross sections for the reaction ep → jet + X at Q2 below 4 GeV2 have been measured with the ZEUS detector at HERA using an integrated luminosity of 0.55 pb-1. These cross sections are given in the kinematic region 0.2 < y < 0.85, for jet pseudorapidities in the ep-laboratory range -1 < ηjet < 2 and refer to jets at the hadron level with a cone radius of one unit in the η - θ plane. These results correspond to quasi-real photoproduction at centre-of-mass energies in the range 130-270 GeV and, approximately, for jet pseudorapidities in the interval -3 < ηjet(λp CMS) < 0. These measurements cover a new kinematic regime of the partonic structure of the photon, at typical scales up to ∼300 GeV2 and photon fractional momenta down to xγ ∼ 10-2. Leading logarithm parton shower Monte Carlo calculations, which include both resolved and direct processes and use the predictions of currently available parametrisations of the photon parton distributions, describe in general the shape and magnitude of the measured ηjet and Etjet distributions. © 1995.

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Gumbo Yearbook, Class Of 1995, Louisiana State University And Agricultural And Mechanical College Jan 1995

Gumbo Yearbook, Class Of 1995, Louisiana State University And Agricultural And Mechanical College

Gumbo Yearbook

The Gumbo yearbook chronicles the entire academic year at LSU. In words and especially photos, the Gumbo shows the people, places, and events that make each year unique. In addition to formal portraits of schools and departments, the book contains hundreds of snapshots of students with their friends and dozens of pages showcasing organizations.

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Aerobic And Anaerobic Starvation Metabolism In Methanotrophic Bacteria, P. Roslev, G. M. King Jan 1995

Aerobic And Anaerobic Starvation Metabolism In Methanotrophic Bacteria, P. Roslev, G. M. King

Faculty Publications

The capacity for anaerobic metabolism of endogenous and selected exogenous substrates in carbon- and energy-starved methanotrophic bacteria was examined. The methanotrophic isolate strain WP 12 survived extended starvation under anoxic conditions while metabolizing 10-fold less endogenous substrate than did parallel cultures starved under oxic conditions. During aerobic starvation, the cell biomass decreased by 25% and protein and lipids were the preferred endogenous substrates. Aerobic protein degradation (24% of total protein) took place almost exclusively during the initial 24 h of starvation. Metabolized carbon was recovered mainly as CO2 during aerobic starvation. In contrast, cell biomass decreased by only 2.4% during …

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Measurement Of Charged And Neutral Current E-P Deep Inelastic Scattering Cross Sections At High Q2, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz Jan 1995

Measurement Of Charged And Neutral Current E-P Deep Inelastic Scattering Cross Sections At High Q2, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, H. Zhang, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. Castellini, M. Chiarini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, C. Nemoz

Faculty Publications

Deep inelastic e-p scattering has been studied in both the charged current (CC) and neutral current (NC) reactions at momentum transfers squared Q2 above 400 GeV2 using the ZEUS detector at the HERA ep collider. The CC and NC total cross sections, the NC to CC cross section ratio, and the differential cross sections d/dQ2 are presented. From the Q2 dependence of the CC cross section, the mass term in the CC propagator is determined to be MW=76 16 13 GeV. © 1995 The American Physical Society.

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The Cote D'Ivoire-Ghana Transform Margin, Eastern Equatorial Atlantic, J. Mascle, G. P. Lohmann, P. Clift Jan 1995

The Cote D'Ivoire-Ghana Transform Margin, Eastern Equatorial Atlantic, J. Mascle, G. P. Lohmann, P. Clift

Faculty Publications

Leg 159 drilled a series of four sites (Sites 959-962) within continental crust adjacent to the continent-ocean transition along the transform passive margin of Cote d'Ivoire-Ghana (CIG). This leg represents the first application of deep-sea drilling to the tectonics of transform margin development. The tectonic evolution from the Cretaceous to the Neogene is described. -from Authors

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Louisiana Agriculture Magazine, Winter 1995, Lsu Agricultural Experiment Station Jan 1995

Louisiana Agriculture Magazine, Winter 1995, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

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Lsu General Catalog 1995-1996, Louisiana State University And Agricultural And Mechanical College Jan 1995

Lsu General Catalog 1995-1996, Louisiana State University And Agricultural And Mechanical College

LSU General Catalog

The LSU General Catalog describes all undergraduate and graduate departments and programs with degree requirements and courses offered for each one. The General Catalog includes information on registration and financial aid as well as academic services offered to all students.

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Regularization And Asymptotic Expansion Of Certain Distributions Defined By Divergent Series, Ricardo Estrada Jan 1995

Regularization And Asymptotic Expansion Of Certain Distributions Defined By Divergent Series, Ricardo Estrada

Faculty Publications

The regularration of tliedistribution [formula omitted]. whichgives a regularized value to the divergent series [formula omitted] is obtained in several spaces of test functions. The asymptotic expansion as ε →0+ of series of the type [formula omitted] is also obtained. © 1995, Hindawi Publishing Corporation. All rights reserved.

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Diallel Analyses Of Percent Kernel Infection By Aspergillus Flavus And Ear Moisture Loss Rate In Maize., Yudong Zhang Jan 1995

Diallel Analyses Of Percent Kernel Infection By Aspergillus Flavus And Ear Moisture Loss Rate In Maize., Yudong Zhang

LSU Historical Dissertations and Theses

Preharvest infection by Aspergillus flavus Link ex Fries and subsequent aflatoxin contamination of maize (Zea mays L.) grain are major production problems. Ear moisture loss rate (EMLR) is an important component of hybrid performance and maturity, and to some extent determines the suitability of a hybrid for a geographical area. A 10-parent diallel experiment was conducted in 1992 and 1994 to study the genetic nature of both percent kernel infection (PKI) by A. flavus and EMLR. General combining ability (GCA, V$\sb{\rm g}$), specific combining ability (SCA, V$\rm\sb{s}$), and reciprocal mean squares for PKI were significant. The ratio $\rm 2V\sb{g}/(2V\sb{g}+V\sb{s}$) was …

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Numerical And Experimental Analysis Of Bending And Vibration Of Stiffened Laminated Composite Panels., Aruna Kumar Tripathy Jan 1995

Numerical And Experimental Analysis Of Bending And Vibration Of Stiffened Laminated Composite Panels., Aruna Kumar Tripathy

LSU Historical Dissertations and Theses

The objective of this study is to develop a method of analysis for fiber glass composite skew plates subjected to static and dynamic loading. An investigation has been carried out on the stress and deflection characteristics of stiffened parallelogramic plates with different skew angles. The numerical solution with assumed displacement function was developed using finite element analysis. Experiments using aluminum and Scotchply composite laminated plates were conducted to verify the results. Cantilever and simply supported boundary conditions were included in the analysis and an optimized angular stiffener for a particular swept back panel was achieved. A finite element model for …

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Study Of Two Instrumental Variable Methods For Closed-Loop Multivariable System Identification., Jeannette Santos-Cordero Jan 1995

Study Of Two Instrumental Variable Methods For Closed-Loop Multivariable System Identification., Jeannette Santos-Cordero

LSU Historical Dissertations and Theses

New control strategies are based on the model of the process and it is thus necessary to identify the systems to be controlled. It is also often necessary to identify them during closed-loop operation in order to maintain efficient operation and product quality. Some results of multivariable closed-loop identification carried out on a simulated 2 x 2 linear time-invariant system, using two new versions of instrumental variable methods called IV4D and IV4UP as the identification methods, are presented. In each case pseudorandom binary signals (PRBS), or dithers, are applied to the outputs of the feedback controllers. Algorithms IV4D and IV4UP …

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Solution Behavior Of Cascade Polymers., Keunok Han Yu Jan 1995

Solution Behavior Of Cascade Polymers., Keunok Han Yu

LSU Historical Dissertations and Theses

This thesis consists of four chapters. In the first, a general introduction is presented. Chapter 2 deals with the characterization of polyamidoamine (PAMAM) cascade polymers. Diffusion coefficients of four different generations (generation 3, 5, 7, and 9) of PAMAMs were measured in aqueous solutions by dynamic light scattering. Generation 3 and 5 were characterized again, after labeling with fluorescein isothiocyanate, by fluorescence photobleaching recovery. The dynamic light scattering results depended on the concentration of added salt in the low salt limit, while the fluorescence values were almost independent of salt concentration. The polyelectrolyte effects, or solution nonidealities, strongly affected light …

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Use Of A Natural Swamp For Wastewater Treatment., Xiaowei Zhang Jan 1995

Use Of A Natural Swamp For Wastewater Treatment., Xiaowei Zhang

LSU Historical Dissertations and Theses

The purposes of this research were to determine the possibility of using a natural forested swamp for advanced wastewater treatment in coastal Louisiana, and to evaluate the wastewater impact on the ecosystem. The study was performed by comparing two portions of a nutrient deficient swamp separated by a ridge. One portion received secondarily treated municipal wastewater at a rate of $6.3\times10\sp6$ L/day and the other served as a control. Concentrations of BOD$\sb5$, TSS, DO, EC, TDS, pH, N, P, S, CI, K, Ca, Mg, Na and trace metals were monitored. Results showed that the wastewater added nutrients into the swamp. …

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Modelling A Multispecies Schooling Fishery In An Upwelling Environment, Mauritania, West Africa., Sidina Ould Dedah Jan 1995

Modelling A Multispecies Schooling Fishery In An Upwelling Environment, Mauritania, West Africa., Sidina Ould Dedah

LSU Historical Dissertations and Theses

Off Mauritania, Northwest Africa, small pelagic fish have long been a valuable target of a large and diverse international fleet. In the early 1990's, average annual catch was about 400,000 metric tons in which three to four families were frequently represented: carangidae (Trachurus trachurus, T. trecae and Decapterus rhonchus); clupeidae (Sardina pilchardus, Sardinella aurita and S. maderensis); scombridae (Scomber japonicus); and lately, trichiuridae (Trichiurus lepturus). Using empirical orthogonal function analysis, it was shown that the study area is a transition zone between permanent upwelling in the north (20-25$\sp\circ$N) and regions with seasonal upwelling in the south (10-16$\sp\circ$N). Also, from 1985 …

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Development Of An Optimal Systems Criteria In The Performance Evaluation Of A Crawfish Sorting Machine., Rommel Gaac Tangonan Jan 1995

Development Of An Optimal Systems Criteria In The Performance Evaluation Of A Crawfish Sorting Machine., Rommel Gaac Tangonan

LSU Historical Dissertations and Theses

This study aimed to: (1) establish a set of optimally configured guidelines for performance testing of crawfish sorting machines; (2) examine biophysical characteristics of crawfish and machine-related design parameters; and, (3) write computer programs covering the essential aspects of the crawfish sorting process. Three crawfish sorting machines were tested in the Spring of 1994 and 1995: (1) cylindrical roller sorter machine, (2) diverging vane belt sorter machine, and (3) grid shaker sorter machine. Both the cylindrical roller sorter and the diverging vane belt sorter separated crawfish into four groups: peeler, medium, large and jumbo; the grid shaker sorter, however, separated …

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Synthesis, Characterization, And Diels-Alder Reactivity Of Polymers Containing The 2,3,6,7-Anthracenetetracarboxyl Unit., James Larry Morris Jan 1995

Synthesis, Characterization, And Diels-Alder Reactivity Of Polymers Containing The 2,3,6,7-Anthracenetetracarboxyl Unit., James Larry Morris

LSU Historical Dissertations and Theses

Anthracene is a fluorescent molecule that undergoes chemical reactions as a Diels-Alder diene. Incorporation of the anthracene nucleus into a polymer system imparts upon it the characteristics of anthracene. This work in concerned with the synthesis of a suitable 2,3,6,7-anthracenetetracarboxylic acid based monomer. The monomer is then polymerized and the resultant polymer is crosslinked in a Diels-Alder reaction. The synthesis of 2,3,6,7-anthracene derivatives is underdeveloped. The difficulty in the synthesis of these compounds has probably precluded their development. Herein is described the synthesis of 2,3,6,7-anthracenetetracarboxylic acid in three simple steps inexpensively and in high yield. Older methods required more steps …

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A Two Dimensional Vertically Integrated Moving Boundary Hydrodynamic Model In Curvilinear Coordinates., Vibhas Aravamuthan Jan 1995

A Two Dimensional Vertically Integrated Moving Boundary Hydrodynamic Model In Curvilinear Coordinates., Vibhas Aravamuthan

LSU Historical Dissertations and Theses

A two dimensional, vertically averaged, hydrodynamic mathematical model on an adaptive boundary fitted grid is developed. This model addresses numerous drawbacks in the traditional finite difference models and incorporates such features as moving boundaries due to tidal incursion, and the ability to resolve irregular coastline geometries. A semi-implicit finite difference scheme is developed in order to overcome time step restrictions due to the gravity wave stability criterion. An eulerian-lagrangian formulation is used to solve the hydrodynamic equations on unsteady grid systems. The model is applied to study circulation features in Lake Pontchartrain (a medium sized physical system) and to the …

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Model For Planning Well Control Operations Involving An Induced Fracture., Alvaro Felippe Negrao Jan 1995

Model For Planning Well Control Operations Involving An Induced Fracture., Alvaro Felippe Negrao

LSU Historical Dissertations and Theses

This dissertation presents a numerical simulator for designing a dynamic kill of an underground blowout. The simulator consists of three sub-programs: a reservoir model, a wellbore model, and a fracture model. Previously published procedures have modeled the fracture by assuming a constant pressure in the wellbore at the depth of fracture. This assumption has sometimes led to unrealistic results. In this work, a hydraulic fracture model is coupled with the reservoir and wellbore model using a system analysis approach. The hydraulic fracture model is based on a pseudo-3D model with some modifications introduced to more accurately model the extension of …

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A Phytochemical Study Of Members Of The Genus Magnolia (Magnoliaceae) And Biosynthetic Studies Of Secondary Metabolites In Asteraceae Hairy Root Cultures., Qi Song Jan 1995

A Phytochemical Study Of Members Of The Genus Magnolia (Magnoliaceae) And Biosynthetic Studies Of Secondary Metabolites In Asteraceae Hairy Root Cultures., Qi Song

LSU Historical Dissertations and Theses

Phytochemical investigations of four members of the genus Magnolia (family Magnoliaceae) were performed to provide lignans and sesquiterpene lactones. The aerial parts of the rare Louisiana native M. pyramidata afforded eight new neolignans with a novel skeleton, pyramidatin A to H. Leaves of M. virginiana provided the known sesquiterpene lactones parthenolide and costunolide as well as the new costunolactol and costunolactol dimer. An annual study of the leave constituents of M. virginiana illustrated that native M. virginiana only produces sesquiterpene lactones but transferred M. virginiana, possibly a northern variety, produces only lignans. The leaves of M. soulangiana gave five known …

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Applications Of Some Robust Statistics In Forestry., Kunjin Shi Jan 1995

Applications Of Some Robust Statistics In Forestry., Kunjin Shi

LSU Historical Dissertations and Theses

All statistical procedures are based on a set of assumptions, such as normality, independence and linearity. In practical applications, these assumptions can rarely be satisfied completely. Deviation from classical parametric assumptions may result in loss of efficiency or even lead to misleading conclusions. Robust statistics that have been extensively studied in the past two decades provide alternatives to deal with such problems. This research was designed to investigate the applicability of robust estimation of population means and robust linear regression in forestry. Five robust estimators, Huber's minimax estimator, Hampel's three parameter redescending estimator, Andrew's wave estimator, Tukey's biweight estimator, and …

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Data Analysis Using Reconstructability Theory., Deky Dicky Joe Gouw Jan 1995

Data Analysis Using Reconstructability Theory., Deky Dicky Joe Gouw

LSU Historical Dissertations and Theses

In this dissertation, we develop a new data analysis method using reconstructability theory, particularly k-systems theory. K-systems or Klir systems theory is a branch of reconstructability theory and provides a setting wherein common problems in statistics can be solved using the power of information theory by invoking the maximum entropy principle. The method is superior over classical statistical data analysis. The approach starts with the concept of variable interaction in reconstructability analysis (RA), We then use the RA definition of interaction to improve the quality of main and interaction effects in data analysis. With classical statistical data analysis, we need …

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Identification Of Activities That Are Appropriate Parts Of A Partnership Between Secondary Technology Education Programs And Business And Industry., Charles Edward Backes Jan 1995

Identification Of Activities That Are Appropriate Parts Of A Partnership Between Secondary Technology Education Programs And Business And Industry., Charles Edward Backes

LSU Historical Dissertations and Theses

The purpose of this study was to identify specific activities that are considered appropriate parts of a partnership between secondary technology education programs and the business and industry community by experts in the field of technology education and business and industry in the southeastern region of the United States. The states included in the study were Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, and Tennessee. A form of the Delphi Technique was used to solicit and reach consensus on the appropriateness of partnership activities between secondary technology education programs and members of the business and industry community. …

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Gas Kick Behavior During Bullheading Operations In Vertical Wells., William Leo Koederitz Jan 1995

Gas Kick Behavior During Bullheading Operations In Vertical Wells., William Leo Koederitz

LSU Historical Dissertations and Theses

An experimental study to investigate the bullheading method of well control was performed. The primary focus of the investigation was the downward displacement of gas by liquid, requiring consideration of counter-current flow behavior. Experiments were conducted in a full-scale well, using a computer-controlled downhole fracture simulation system; water and low-viscosity drilling mud were used for bullheading fluids. The results from these experiments provided simple models for the estimation of removal efficiency and maximum pump pressure during bullheading operations. These models are empirical and are limited to conditions within the range of the experimental data. A two-phase flow analysis of the …

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Robust Adaptive Control In H(Infinity)., Gisoon Kim Jan 1995

Robust Adaptive Control In H(Infinity)., Gisoon Kim

LSU Historical Dissertations and Theses

This dissertation addresses the problem of unifying identification and control in the paradigm of ${\cal H}\sb\infty$ to achieve robust adaptive control. To achieve robust adaptive control, we employ the same approach used for identification in ${\cal H}\sb\infty$ and robust control in ${\cal H}\sb\infty.$ In the modeling part, we aim not only to identify the nominal plant, but also to quantify the modeling error in ${\cal H}\sb\infty$ norm. The linear algorithm based on least-squares is used, and the upper bounds for the corresponding modeling error are derived. In the control part, we aim to achieve the performance specification in frequency domain …

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Solid Removal Schemes And The Rotating Biological Contactor In Recirculating Fish Culture Systems., Aurelio Alfonso Delos Reyes Jr Jan 1995

Solid Removal Schemes And The Rotating Biological Contactor In Recirculating Fish Culture Systems., Aurelio Alfonso Delos Reyes Jr

LSU Historical Dissertations and Theses

The performance of combinations of the Norpac$\sp\circler$ tube RBC with a bead filter (System I), a tube settler (System II), and a sand filter (System III) in pilot scale recirculating systems stocked with tilapia were evaluated and compared. Good fit empirical equations were obtained relating TAN and NO$\sp2$-N (both exponential), and DO (linear) with daily amount of feed. Likewise, linear equations relating bead filter or sand filter pressure with feed, and flow with pressure were obtained. Systems I and II maintained favorable water quality up to the maximum feed load studied of 3 kg/day. System III effectively handled only 1.2 …

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