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Design And Analysis Of Optical Interconnection Networks For Parallel Computation., Yueming Li Jan 1997

Design And Analysis Of Optical Interconnection Networks For Parallel Computation., Yueming Li

LSU Historical Dissertations and Theses

In this doctoral research, we propose several novel protocols and topologies for the interconnection of massively parallel processors. These new technologies achieve considerable improvements in system performance and structure simplicity. Currently, synchronous protocols are used in optical TDM buses. The major disadvantage of a synchronous protocol is the waste of packet slots. To offset this inherent drawback of synchronous TDM, a pipelined asynchronous TDM optical bus is proposed. The simulation results show that the performance of the proposed bus is significantly better than that of known pipelined synchronous TDM optical buses. Practically, the computation power of the plain TDM protocol …

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Tribological Behavior Of Duplex Nitrogen Diffusion/Dlc Coating Treatments., Yan Liu Jan 1997

Tribological Behavior Of Duplex Nitrogen Diffusion/Dlc Coating Treatments., Yan Liu

LSU Historical Dissertations and Theses

Diamond-like carbon (DLC) coatings have high potential for developing advanced tribological systems and the overall objective of the present research is to provide a framework to theoretically design and experimentally develop and study such systems of interest. The present research concentrates on the following specific aspects: the fundamental wear mechanism of DLC coatings; finite element (FE) modeling to understand the stress distribution in coating/substrate system under indentation and friction; and the influence of graded interface on the tribological behavior of DLC coatings. The experimental results showed that DLC films possess low friction coefficient ($f\sb{init}$: 0.12-0.20, $f\sb{fin}$: 0.06-0.08) and low wear …

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Numerical Simulation Of Geosynthetic Reinforced Earth Structures Using Finite Element Method., Surajit Pal Jan 1997

Numerical Simulation Of Geosynthetic Reinforced Earth Structures Using Finite Element Method., Surajit Pal

LSU Historical Dissertations and Theses

Geosynthetics are widely used as reinforcements in various earth structures. Current design methods are based on some simplified assumptions and are primarily modified versions of limit equilibrium methods used in design of the unreinforced earth structures. All of these design methods are conservative and result in uneconomical design. The best method for verifying the design assumptions and studying the stress-deformation behavior of geosynthetic reinforced earth structures is by constructing a series of large scale test walls with adequate instrumentation and collecting data from them. But the cost involved in such a scheme precludes undertaking this kind of study. Thus Numerical …

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Nursing Fathers: American Colonists' Conception Of English Protestant Kingship., Benjamin Lewis Price Jan 1997

Nursing Fathers: American Colonists' Conception Of English Protestant Kingship., Benjamin Lewis Price

LSU Historical Dissertations and Theses

This dissertation traces the development of the concept of English Protestant kingship within the political culture of colonial America from the Glorious Revolution of 1688 to the beginning of the American Revolution. It is meant to illustrate the place of British kings within the structure and ideology of American colonial politics and society during that period. It illustrates Americans' understanding of the protection-allegiance relationship between English Protestant kings, especially the first two Hanoverian monarchs, and their subjects in the provinces of North America. This study also explores the language of Whig political discourse with its two primary "dialects" of Court …

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Vegetation, Soils, And Hydrology Of Central Louisiana Bottomland Hardwood Forest Types., William Brown Patterson Jan 1997

Vegetation, Soils, And Hydrology Of Central Louisiana Bottomland Hardwood Forest Types., William Brown Patterson

LSU Historical Dissertations and Theses

Wetland delineation in bottomland hardwood forests is controversial due to uncertainty of the duration of inundation and soil saturation on seasonally dry sites. Wetland delineation requires an assessment of hydrophytic vegetation, hydric soils, and wetland hydrology. The objectives were to: (i) classify forest types in five Wildlife Management Areas in central Louisiana within Sharkey clay and Fausse clay soil mapping units, (ii) compare site and soil variables between the forest types, (iii) evaluate relationships between tree species distributions and soil/site factors, (iv) characterize soils in the study area, (v) evaluate differences in forest types for durations of inundation, soil saturation, …

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Determination Of Hydrocarbon Type From The Dual-Spaced Neutron Tool Responses., Luis Fernando Quintero Jan 1997

Determination Of Hydrocarbon Type From The Dual-Spaced Neutron Tool Responses., Luis Fernando Quintero

LSU Historical Dissertations and Theses

A new interpretation method that allows for the determination of the fluid type present in a formation of interest was developed. The new method is referred to as the "Three Neutron Porosity Log". The method is based on an algorithm that determines three apparent neutron porosities. These porosities, derived from the raw counts of the dual-spaced neutron tool, have three different radii of investigation. All three neutron porosities, near, far, and ratio, when properly calibrated read the true porosity in water-bearing zones. In oil or gas-bearing zones the mud filtrate invasion profile will cause the three apparent neutron porosities to …

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Evaluation Of Alternative Gases For Immiscible Cyclic Injection., Sara Shayegi Jan 1997

Evaluation Of Alternative Gases For Immiscible Cyclic Injection., Sara Shayegi

LSU Historical Dissertations and Theses

Cyclic gas injection processes have been primarily restricted to the use of pure CO$\sb2$ or CO$\sb2$ that has been slightly contaminated with reservoir gases. However, it is difficult to employ CO$\sb2$ in certain circumstances due to transport, economic, or corrosion problems. This study presents the results of laboratory investigations of the cyclic gas injection process using methane, nitrogen and combinations of these gases with CO$\sb2$. Cyclic gas injections were performed at immiscible conditions in consolidated sandstone cores that contained waterflood residual oil under analogous conditions to previous cyclic CO$\sb2$ injections for comparative purposes. Pure methane recovered approximately the same amount …

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Injection Of Species Under Electrical Field To Enhance Bioremediation., Fazle Rabbi Jan 1997

Injection Of Species Under Electrical Field To Enhance Bioremediation., Fazle Rabbi

LSU Historical Dissertations and Theses

Electrokinetics is one of the most viable alternatives for injecting/extracting water, organic and ionic species in low permeability soils as well as heterogeneous media because the transport processes are independent of the pore sizes. A better understanding of the principles offers the opportunity to employ multi-component species transport under electrical fields to inject electron acceptors, nutrients and other process additives for enhancement of in-situ bioremediation in low permeability and heterogeneous media. This study assesses the potential to employ and exploit the principles of multi-component species transport under electrical fields as mean to supplement, enhance and engineer in-situ bioremediation. It was …

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Orientation Effects On African-American Engineering Students: The Lsu Case., Forest Dent Smith Jan 1997

Orientation Effects On African-American Engineering Students: The Lsu Case., Forest Dent Smith

LSU Historical Dissertations and Theses

Extended orientation courses continue to be introduced as curriculum offerings that assist students to persist in post-secondary institutions. Research on the outcomes of such courses in terms of student retention and achievement is, with regard to race, however, not proceeding at the same pace as orientation course research in general. The purpose of this study was to apply the attrition models of Tinto (1987) and Pascarella, Terenzini, and Wolfe (1986) and examine extended orientation as a contributing factor to the retention and achievement of African-American engineering students. The sample of the study consisted of 354 African-American students who were members …

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Traffic Management And Congestion Control In The Atm Network Model., Sundararajan Vedantham Jan 1997

Traffic Management And Congestion Control In The Atm Network Model., Sundararajan Vedantham

LSU Historical Dissertations and Theses

Asynchronous Transfer Mode (ATM) networking technology has been chosen by the International Telegraph and Telephony Consultative Committee (CCITT) for use on future local as well as wide area networks to handle traffic types of a wide range. It is a cell based network architecture that resembles circuit switched networks, providing Quality of Service (QoS) guarantees not normally found on data networks. Although the specifications for the architecture have been continuously evolving, traffic congestion management techniques for ATM networks have not been very well defined yet. This thesis studies the traffic management problem in detail, provides some theoretical understanding and presents …

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Coastal Restoration Using Pipeline-Conveyed Sediments., Catherine Faith Voisin Jan 1997

Coastal Restoration Using Pipeline-Conveyed Sediments., Catherine Faith Voisin

LSU Historical Dissertations and Theses

A spreadsheet program was successfully developed which determines the engineering requirements for pipeline transport of sediments from dredge sites to wetland restorations sites. The program called SLURRY.XLS involves several new correlations. A new correlation for determining the critical velocity of particle transport is presented. New correlations were statistically developed for determining the drag coefficient of particles. The spreadsheet also successfully determines settling velocities of the individual particle sizes in any settling regime. A second spreadsheet program entitled "CONSOL.XLS" uses geotechnical principles of consolidation for determining marsh surface elevation with and without hydraulic fill versus time. The CONSOL.XLS program permits the …

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Feature-Based Models For Three-Dimensional Data Fitting., Gregory Todd Dobson Jan 1997

Feature-Based Models For Three-Dimensional Data Fitting., Gregory Todd Dobson

LSU Historical Dissertations and Theses

There are numerous techniques available for fitting a surface to any supplied data set. The feature-based modeling technique takes advantage of the known, geometric shape of the data by deforming a model having this generic shape to approximate the data. The model is constructed as a rational B-spline surface with characteristic features superimposed on its definition. The first step in the fitting process is to align the model with a data set using the center of mass, principal axes and/or landmarks. Using this initial orientation, the position, rotation and scale parameters are optimized using a Newton-type optimization of a least …

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A Case-Ready Modified-Atmosphere Packaging System For Beef., Brian Scott Smith Jan 1997

A Case-Ready Modified-Atmosphere Packaging System For Beef., Brian Scott Smith

LSU Historical Dissertations and Theses

Beef tenderness and color stability were evaluated in conventional and modified atmosphere packaging (MAP) systems. Equal portions of inside rounds removed immediately (PM0) or at 48 h postmortem (PM48) were vacuum packaged (VP) whole or cut into steaks and packaged in 80%N$\sb2$:20%CO$\sb2$ MAP. On day 12, MAP environments were exchanged for 80%O$\sb2$:20%CO$\sb2$. Calpastatin activity was lower at 2 d postmortem for PM48 steaks than PM0 steaks. Electrophoresis indicated more degradation of 50 and $>$250 kDA compounds at 2 d postmortem for PM48 than PM0 steaks. Steaks from PM48 required less shear force than PM0 steaks. HunterLab 'L', 'a' and …

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The Production Of Glucooligosaccharides By Leuconostoc Mesenteroides Atcc 13146 And Lipomyces Starkeyi Atcc 74054., Sun Kyun Yoo Jan 1997

The Production Of Glucooligosaccharides By Leuconostoc Mesenteroides Atcc 13146 And Lipomyces Starkeyi Atcc 74054., Sun Kyun Yoo

LSU Historical Dissertations and Theses

Glucooligosaccharides of less than DP 10 were produced either by mixed cultures of Leuconostoc mesenteroides ATCC 13146 and L. starkeyi ATCC 74054, or by an acceptor reaction produced by Leuconostoc mesenteroides ATCC 13146. The yields of glucooligosaccharides produced by mixed culture and acceptor reaction reached up to 49 and 90% of theoretical yield. The composition of carbohydrates at the end of fermentation by mixed culture was 31.4% oligosaccharides, 17.6% dextran, 31.4% mannitol, 2.1% fructose, and 2.4% of sucrose. The composition of carbohydrates at the end of fermentation by acceptor reaction was 32.7% pannose, 30.4% branched isomaltotetraose (DP 4), 21.7% branched …

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Coastal Management Regarding Beach And Dune Protection: An Exploratory Analysis., Melissa Lee Gordon Jan 1997

Coastal Management Regarding Beach And Dune Protection: An Exploratory Analysis., Melissa Lee Gordon

LSU Historical Dissertations and Theses

The Congressional declaration of national coastal policy in Section 303 of the Federal Coastal Zone Management Act (CZMA) of 1972 charges the coastal states to meet the objective of coastal resource protection. At this time, when the appropriate mix of authority between federal and state governments concerning environmental regulations is in debate; it is important to determine whether the inter-governmental partnership created by CZMA is effective in protecting coastal resources. This research is an exploratory analysis of coastal management regarding beach and dune protection within the twenty-four coastal states. The dissertation objectives are as follows: (1) determine the level of …

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An Identification Of Primary Evaluands As Perceived By Undergraduate Students And Faculty In A College Of Agriculture., Karen Renee Juneau Jan 1997

An Identification Of Primary Evaluands As Perceived By Undergraduate Students And Faculty In A College Of Agriculture., Karen Renee Juneau

LSU Historical Dissertations and Theses

This study determined appropriate evaluands for a College of Agriculture based on the perceptions of two shareholder groups of the college, the faculty and undergraduate students. Student opinions about their college experiences appeared related to the goals and influences that prompted them to attend college. These goals and influences determined what they expected from their college experience. There were three parts to the study; a pilot study, an undergraduate student study and a faculty study. Undergraduate students were classified based on two break points, gender and nontraditional/traditional student status. There were four focus groups conducted for the study and fourteen …

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Linear Matrix Inequality Approach To Robust Emergency Lateral Control Of A Highway Vehicle With Time-Varying Uncertainties., Robert Edward Benton Jr Jan 1997

Linear Matrix Inequality Approach To Robust Emergency Lateral Control Of A Highway Vehicle With Time-Varying Uncertainties., Robert Edward Benton Jr

LSU Historical Dissertations and Theses

New linear-matrix-inequality (LMI) based methods are developed for the static-output-feedback stabilization and reduced-gain static-output-feedback stabilization of time-invariant systems. Unlike previous methods, the static-output-feedback method is non-iterative in LMI solutions. The methods are extended to design robust static-output-feedback controllers for time-varying systems using a polytopic-systems approach. Examples are given which demonstrate the use of each of the new methods. The specific problem of emergency lateral control of a highway vehicle is then addressed using the new robust static-output-feedback method. A controller is designed which robustly stabilizes the vehicle over the range of highway speeds (15 to 30 m/s) and a range …

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Development Of Thin Gold Film Thermal Sensors For Synchrotron X-Ray Exposure Diagnostics., Harish M. Manohara Jan 1997

Development Of Thin Gold Film Thermal Sensors For Synchrotron X-Ray Exposure Diagnostics., Harish M. Manohara

LSU Historical Dissertations and Theses

High aspect ratio lithography utilizes high intensity exposure sources, such as synchrotron storage rings, to deposit sufficient dose in the resist to produce a successful pattern transfer. Such highly powerful sources are known to cause undesirable thermal effects in the mask-resist-substrate system. Hence, the measurement of temperature of a mask-resist-substrate system during irradiation is an important exposure diagnostic feature. Deposition of a reasonably accurate dose in the resist is controlled by knowledge of the exposure source intensity. Periodic monitoring of the synchrotron radiation beam power and its spatial distribution at the exposure plane is necessary. In this research, diagnostic techniques …

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A Comparison Of Leonard Bernstein's Incidental Music For The Film "On The Waterfront" And The Subsequent "Symphonic Suite" For The Film, And An Original Composition: Symphony No. 1: "Music For Theater"., Stephen John Lias Jan 1997

A Comparison Of Leonard Bernstein's Incidental Music For The Film "On The Waterfront" And The Subsequent "Symphonic Suite" For The Film, And An Original Composition: Symphony No. 1: "Music For Theater"., Stephen John Lias

LSU Historical Dissertations and Theses

The first portion of this dissertation compares Leonard Bernstein's incidental music to the film On the Waterfront with the subsequent concert suite that was derived from this score. By exploring the content of the film score, as well as the manner in which this music was adapted for the suite, some excellent insight can be gained into Bernstein's approach to both works, as well as the many requirements that the cinematic idiom places on the composer. Special attention is paid to the degree to which the dramatic content of the film influenced the construction of the incidental music. In the …

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Acid Solubilization Of Fish Protein For Production Of Protein Hydrolysate., Ercument Ozer Jan 1997

Acid Solubilization Of Fish Protein For Production Of Protein Hydrolysate., Ercument Ozer

LSU Historical Dissertations and Theses

The mechanism of fish protein solubilization by acid hydrolysis at elevated temperatures was investigated. Rate expressions for the solubilization were determined using pilot scale data with two different rate determination methods. A postulated mechanism was verified and estimated rates were evaluated on five independent verification experiments. A functional relationship between nonprotein byproduct concentration and whiteness of fish protein hydrolysate (FPH) was developed. Initial and set-point operating variables were calculated to produce FPH with acceptable color characteristics for food use. A batch reactor was used for duplicate hydrolysis trials conducted at three acid and three temperature levels for four hours. Samples …

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Wood Fiber Reinforced Polypropylene Composites., Minqiu Lu Jan 1997

Wood Fiber Reinforced Polypropylene Composites., Minqiu Lu

LSU Historical Dissertations and Theses

Mechanical properties of polypropylene (PP)/wood fiber composites depend not only on the properties of each primary component but also on a complex interaction of several factors such as fiber loading and size, characteristics of fiber-polymer matrix interface, and the processing conditions. Both sequential and simultaneous composites are formulated in this research. First, sequential composites are made by compounding wood fibers with PP in the presence of maleated polypropylene (MPP) as a coupling agent in a twin-screw extruder. A small amount of MPP (1 wt%) present in these sequential composites can increase the tensile strength of the composites significantly. The tensile …

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Caprine Sperm Cells As Vectors For Gene Transfer., Yongxin Sun Jan 1997

Caprine Sperm Cells As Vectors For Gene Transfer., Yongxin Sun

LSU Historical Dissertations and Theses

Goat sperm cells were used as a model to evaluate sperm-mediated gene transfer. Fresh and frozen-thawed goat sperm cells were co-incubated with radio-labelled foreign DNA. After 10 extensive washings, the compacted sperm retained foreign DNA. Confocal microscopy confirmed that the position on the sperm cell responsible for binding of foreign DNA was located in both the anterior and the posterior heads of caprine sperm cells. Furthermore, confocal longitudinal sections of the sperm cells showed that foreign DNA had penetrated into goat sperm nuclei. In this study, 37% of the fresh goat sperm and 33% of the frozen-thawed goat sperm cells …

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Causes Of Vegetation Dieback And Subsequent Wetland Loss In Two Louisiana Coastal Marshes., Eric Courtney Webb Jan 1997

Causes Of Vegetation Dieback And Subsequent Wetland Loss In Two Louisiana Coastal Marshes., Eric Courtney Webb

LSU Historical Dissertations and Theses

Vegetation dieback is an important component of the wetland loss process in coastal Louisiana. To determine the factors causing vegetation dieback in a Louisiana salt marsh and oligohaline marsh, field monitoring and manipulative field experiments were conducted in both marsh types. In the salt marsh, a three-year field study was conducted in which biotic and edaphic characteristics were measured and the effect of elevation on four salt marsh plant species was tested in a manipulative field experiment. In the oligohaline marsh, a two-year field study was conducted which evaluated the relationship between biotic and edaphic characteristics. Additionally, the effects of …

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Family Context And Premarital Sexual Activity In Kinshasa, Zaire., Yanyi Kasongo Djamba Jan 1997

Family Context And Premarital Sexual Activity In Kinshasa, Zaire., Yanyi Kasongo Djamba

LSU Historical Dissertations and Theses

Studies on sexual behavior in Africa have shown that the proportion of women with premarital sexual experience is high, but the factors associated with premarital sexual behavior have not been clearly identified. This is partly due to the separation between theory and research. This study attempts to fill this gap by constructing a new conceptual framework in which hypotheses of rational adaptation, social disorganization, and patrilineal bias theories can be empirically tested. Based on a life history approach, the present framework emphasizes the role of three dimensions of family background in shaping individual behavior: financial capital, human capital, and social …

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Efficient Mapping Of Neural Network Models On A Class Of Parallel Architectures., Behnam Seyed Arad Jan 1997

Efficient Mapping Of Neural Network Models On A Class Of Parallel Architectures., Behnam Seyed Arad

LSU Historical Dissertations and Theses

This dissertation develops a formal and systematic methodology for efficient mapping of several contemporary artificial neural network (ANN) models on k-ary n-cube parallel architectures (KNC's). We apply the general mapping to several important ANN models including feedforward ANN's trained with backpropagation algorithm, radial basis function networks, cascade correlation learning, and adaptive resonance theory networks. Our approach utilizes a parallel task graph representing concurrent operations of the ANN model during training. The mapping of the ANN is performed in two steps. First, the parallel task graph of the ANN is mapped to a virtual KNC of compatible dimensionality. This involves decomposing …

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A Micro-Mechanical Fatigue Damage Model For Uni-Directional Metal Matrix Composites., Rainer Echle Jan 1997

A Micro-Mechanical Fatigue Damage Model For Uni-Directional Metal Matrix Composites., Rainer Echle

LSU Historical Dissertations and Theses

A micro-mechanical damage model for high cycle fatigue loading based on thermo-dynamical principles is developed for uni-directional continuous fiber reinforced metal matrix composites. The model uses a micro-mechanical based theory to predict the fatigue damage evolution in the individual constituents of the composite material, namely the fibers and the matrix, from which the overall fatigue damage evolution in the composite is obtained. The micro-mechanical analysis is performed for each individual constituent using stress and strain concentration tensors based on the Mori-Tanaka method. A fatigue damage criterion based on thermo-dynamical principles is developed and applied to each of the constituents. Fatigue …

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Electron Scattering Studies In The Framework Of The Symplectic Shell Model., Jutta Escher Jan 1997

Electron Scattering Studies In The Framework Of The Symplectic Shell Model., Jutta Escher

LSU Historical Dissertations and Theses

Electron scattering offers numerous advantages for studying nuclear structure: the weakness of the electromagnetic interaction, the precise knowledge of the reaction mechanism, the ability to vary independently the transferred momentum and energy, as well as the excellent spatial resolution that can be obtained with the point-like probing particles, have made this approach a valuable tool in nuclear physics. Scattering experiments provide crucial tests for the applicability and limitations of modern nuclear models and further our understanding of the nucleon-nucleon interaction and its modifications in nuclear matter. A microscopic theory for deformed nuclei, which takes proper account of the Exclusion Principle …

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Cost Analysis And Air Pollution Impact Of Electric Vehicles On A Metropolitan Area., Hector David Arias-Varela Jan 1997

Cost Analysis And Air Pollution Impact Of Electric Vehicles On A Metropolitan Area., Hector David Arias-Varela

LSU Historical Dissertations and Theses

During the 1990's, increasing attention has been paid to electric vehicles (EV's) because of their potential to reduce air pollution in metropolitan areas such as the Los Angeles Metropolitan Area in the U.S., Mexico City and Its Metropolitan Area in Mexico, Greater London in the United Kingdom and other urban areas. However, few studies to determine the costs and benefits of reducing air pollution by introducing EV's into these mega cities have been carried out. A model to determine the marginal costs and environmental impact of electric vehicles on a metropolitan area is designed in this study. The model simulates …

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Applying Significance Testing To The Taguchi Methods Of Quality Control., Shannon Jo Kast Jan 1997

Applying Significance Testing To The Taguchi Methods Of Quality Control., Shannon Jo Kast

LSU Historical Dissertations and Theses

During recent years, the Taguchi Methods of quality control have been adopted in many industries because the goal of the methods is to produce a product or process that is robust to environmental conditions and component variation. The methodology involves using statistical experimental designs to achieve this goal through analyzing a performance measure, called a signal-to-noise ratio, that takes into account both variation and target value. However, many statisticians have criticized the Taguchi Methods for the lack of use of sound statistical practices. This research will focus on one specific aspect of the Taguchi Methods: the signal-to-noise ratio. Sampling distributions …

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I. Photophysics And Photochemistry Of Molybdenum-Oxo Complexes. Ii. Synthesis Of A Ferrocene-Based Monomer For Use In Ring-Opening Metathesis Polymerization., Ralph Isovitsch Jan 1997

I. Photophysics And Photochemistry Of Molybdenum-Oxo Complexes. Ii. Synthesis Of A Ferrocene-Based Monomer For Use In Ring-Opening Metathesis Polymerization., Ralph Isovitsch

LSU Historical Dissertations and Theses

The brick-red ferrocenophene 1,4-(3,3$\sp\prime$-bis(1,1-dimethylpentyl)-1,1$\sp\prime$-ferrocenediyl) -1,3-butadiene was prepared via a six-step synthetic route. It was isolated and characterized for use as a monomer in Ring Opening Metathesis Polymerization. Fluorescent molybdenum(V)-oxo complexes such as $\rm MoOCl\sb4(H\sb2O)\sp-$ undergo thermal and photochemical reactions with the series of phosphines $\rm PEt\sb2,\ PEt\sb3Ph,\ PEtPh\sb2$ and PPh$\sb3$ as oxygen atom acceptors. PEt$\sb3$ reacts spontaneously to form several products: $\rm (PPh\sb4)\lbrack MoCl\sb4(PEt\sb3)\sb2\rbrack,\ (PPh\sb4)\sb2\lbrack MoOCl\sb5\rbrack{\cdot}2CH\sb2Cl\sb2,$ and a maroon oil that contains $\rm OPEt\sb3,\ MoOCl\sb2(PEt\sb3)\sb3$ and $\rm MoCl\sb4(PEt\sb3)\sb2.$ Both $\rm (PPh\sb4)\lbrack MoCl\sb4(PEt\sb3)\sb2\rbrack$ and OPEt$\sb3$ are products of an oxygen atom transfer reaction. PEt$\sb2$Ph and PEtPh$\sb2$ also produce the corresponding phosphine …

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