Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Louisiana State University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 13351 - 13380 of 15224

Full-Text Articles in Entire DC Network

Estimation Of The Renewal Function., Binshan Lin Jan 1988

Estimation Of The Renewal Function., Binshan Lin

LSU Historical Dissertations and Theses

The computation of the renewal function when the distribution function is completely known has received much attention in the literature. However, in many cases the form of the distribution function is unknown and has to be estimated nonparametrically. Several nonparametric estimators for the renewal function for complete data were suggested by Frees (1986) and Schneider et al. (1988). In many cases, however, censoring of the lifetime might occur. In this study, estimators of the renewal function based on randomly censored data is discussed. We introduce nonparametric estimators of the renewal function and show that the estimators compare well with a …

Go to article

Intermolecular Interactions And The Theory Of Electron Transfer Between Hexaaquoiron Ions And Hexaammineruthenium Ions In Water., Paul James Magestro Jan 1988

Intermolecular Interactions And The Theory Of Electron Transfer Between Hexaaquoiron Ions And Hexaammineruthenium Ions In Water., Paul James Magestro

LSU Historical Dissertations and Theses

Theoretical studies of the electron transfer rates between hexaaquoiron(II) and (III) ions, and between hexaammineruthenium(II) and (III) ions in aqueous solutions have been undertaken using detailed representations of the interaction potentials and including the flexibility of the ligand geometry. This is done through an intuitive and efficient computational scheme involving tested site-site potentials for water and ammonia. The calculations on the ferrous-ferric electron exchange indicate that fluctuations in the configuration of the hydration shell are important and affect the rate significantly. In the hexaammineruthenium reaction, there is no evidence for any substantial contribution from this factor, although rates tend to …

Go to article

How Forgetting Facilitates Remembering: An Analysis Of The Contextual Interference Effect In Motor Learning., Carol Cosgrove Poto Jan 1988

How Forgetting Facilitates Remembering: An Analysis Of The Contextual Interference Effect In Motor Learning., Carol Cosgrove Poto

LSU Historical Dissertations and Theses

The experiments reported here were designed to test a hypothesis regarding why the contextual interference (CI) effect in retention of motor skills occurs. It was hypothesized that the high-CI or random group performs better on a retention test than the low-CI or blocked group because the random schedule has included practice in retrieving motor tasks from long-term memory (LTM). This is the same information-processing activity required for successful retention test performance. In essence, both groups learn the motor task to the same extent, but the random group also learns to recall the task from LTM on demand. In the first …

Go to article

On The Thermodynamics Of Quantum-Electrodynamic Frequency Shifts, G. W. Ford, J. T. Lewis, R. F. O'Connell Dec 1987

On The Thermodynamics Of Quantum-Electrodynamic Frequency Shifts, G. W. Ford, J. T. Lewis, R. F. O'Connell

Faculty Publications

A paper by Barton (ibid., vol.20, p.879, 1987) comments on some of Ford et al.'s recent work in this general area and takes issue with some of their conclusions. Ford et al. point out that Barton's reinterpretation of his own previous work actually serves to support their conclusions. In particular, he is making extensive use of thermodynamic concepts (free energy, thermodynamic perturbation theory, . . .) which were introduced for the first time into this area in the papers by Ford et al.

Go to article

Louisiana Agriculture Magazine, Summer 1987, Lsu Agricultural Experiment Station Jul 1987

Louisiana Agriculture Magazine, Summer 1987, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Go to article

Benthic Foraminiferal Assemblages From Mexican Continental Shelves, Maria De La Luz Mata Apr 1987

Benthic Foraminiferal Assemblages From Mexican Continental Shelves, Maria De La Luz Mata

LSU Historical Dissertations and Theses

The recent benthic foraminifera 1 fauna of the continental margins of Mexico (Gulf of Campeche and Gulf of Tehuantepec) was studied. Surficial sediment samples (lOcc) were collected using a Shipeck dredge and were stained with Sudan Black "B" in order to differentiate the living fauna from the death assemblage. In the 41 samples from the Gulf of Campeche, 279 species were found in the total assemblage in water depths ranging from 9 to 586 m. In the 22 samples in the Gulf of Tehuantepec, 132 species were identified from the total assemblage in water depths of 20 to 180 m. …

Go to article

Spoil Banks: Effects On A Coastal Marsh Water-Level Regime, Erick M. Swenson, R. Eugene Turner Jan 1987

Spoil Banks: Effects On A Coastal Marsh Water-Level Regime, Erick M. Swenson, R. Eugene Turner

Faculty Publications

Above- and below-ground water-level fluctuations were measured in the marshes south of New Orleans, Louisiana, between November 1982 and December 1983. The purpose of the program was to defme the basic marsh water-level regime and to investigate how canal spoil banks may influence the water-level regime. Two study areas were used: (1) a control area, defined as a section of marsh with unrestricted hydrologic connection to an adjacent bayou; and, (2) a partially-impounded area, defined as an area with limited hydrologic connection to an adjacent bayou due to the presence of dredged canal spoil banks. Data sources included marsh water …

Go to article

A Description Of The Meaning-Making Strategies Reported By Proficient Readers And Writers., Sarah H. Martin Jan 1987

A Description Of The Meaning-Making Strategies Reported By Proficient Readers And Writers., Sarah H. Martin

LSU Historical Dissertations and Theses

The purpose of this study was to develop a description of the cognitive strategies reported by proficient readers and writers as they completed a variety of reading and writing tasks. Seven above-average, twelfth-grade students were selected as subjects from teacher recommendations and standardized test scores. Each subject was involved in five data collection sessions: (a) a writing assessment/think aloud practice session, (b) writing a reflexive task, (c) writing an extensive task, (d) reading a concrete text, and (e) reading an abstract text. All sessions were held with subjects individually. The data collection techniques included: (a) recording the thoughts subjects reported …

Go to article

Conditioning Of Ryegrass For Faster Drying, M Tsang Mui Chung Jan 1987

Conditioning Of Ryegrass For Faster Drying, M Tsang Mui Chung

LSU Agricultural Experiment Station Reports

No abstract provided.

Go to article

Nitrogen Fertilization Influences On Cotton Yields, Petiole Nitrate Concentrations, And Residual Soil Nitrate Levels At The Macon Ridge, Northeast, And Red River Research Stations, S A. Phillips Jan 1987

Nitrogen Fertilization Influences On Cotton Yields, Petiole Nitrate Concentrations, And Residual Soil Nitrate Levels At The Macon Ridge, Northeast, And Red River Research Stations, S A. Phillips

LSU Agricultural Experiment Station Reports

No abstract provided.

Go to article

Year-Round Production Of Slaughter Beef Using Optimum Levels Of Forages, C P. Bagley Jan 1987

Year-Round Production Of Slaughter Beef Using Optimum Levels Of Forages, C P. Bagley

LSU Agricultural Experiment Station Reports

No abstract provided.

Go to article

Plant-Tissue Analysis As A Diagnostic Aid In Crop Production, J E. Sedberry Jan 1987

Plant-Tissue Analysis As A Diagnostic Aid In Crop Production, J E. Sedberry

LSU Agricultural Experiment Station Reports

No abstract provided.

Go to article

Effect Of Seasonal Changes In Leydig Cell Number On The Volume Of Smooth Endoplasmic Reticulum In Leydig Cells And Intratesticular Testosterone Content In Stallions, L. Johnson, D. L. Thompson Jan 1987

Effect Of Seasonal Changes In Leydig Cell Number On The Volume Of Smooth Endoplasmic Reticulum In Leydig Cells And Intratesticular Testosterone Content In Stallions, L. Johnson, D. L. Thompson

Faculty Publications

Testes from 47 adult (4-20 years) stallions obtained in November-January (non-breeding season) and 41 adult stallions obtained in May-July (breeding season) were perfused with glutaraldehyde, placed in osmium and embedded in Epon 812. Percentage Leydig cell cytoplasm or nuclei in the testis was determined by point counting of 0.5 μm sections under bright-field microscopy. Testes from 6 randomly selected horses per season were processed for electron microscopy. The volume (ml) of SER/testis was calculated from the % SER in the cytoplasm % Leydig cell cytoplasm, and parenchymal volume. Number of Leydig cells was calculated from the % nuclei, parenchymal volume, …

Go to article

A Study Of The Temperature Dependence Of Ion-Molecule Association Reactions. Halide Ion Addition To A Selected Group Of Lewis Acids., Charles Ray Herd Jan 1987

A Study Of The Temperature Dependence Of Ion-Molecule Association Reactions. Halide Ion Addition To A Selected Group Of Lewis Acids., Charles Ray Herd

LSU Historical Dissertations and Theses

Recent evidence has indicated that the ion-molecule association reaction BF$\sb 3$ + F$\sp -$ - thinspace- BF$\sb 4\sp -$ has both collisional stabilization and radiative stabilization pathways. Preliminary studies indicated that other boron trihalide systems (BF$\sb 3$ + Cl$\sp -$, Br$\sp -$, and BCl$\sb 3$ + Cl$\sp -$, Br$\sp -$) behave similarly. We have studied the temperature dependence of these systems in an effort to learn more about the individual rate coefficients that constitute the standard association mechanism modified to include a radiative stabilization pathway. In order to determine properties of a system which play an important role in the …

Go to article

An Experimental Research Study On The Effect Of Recognition And Disclosure Of Corporate Pension Plan Assets And Obligations On Investment Decisions., Mary Jeanne Welsh Jan 1987

An Experimental Research Study On The Effect Of Recognition And Disclosure Of Corporate Pension Plan Assets And Obligations On Investment Decisions., Mary Jeanne Welsh

LSU Historical Dissertations and Theses

The purpose of this study was to determine whether investment decisions are affected by the way in which pension information is presented in financial statements. MBA students and financial analysts were asked to estimate future stock prices and make purchase recommendations for ten cases based on selected sets of accounting and financial information. Three different forms of the information cue set were used. The pension cue was presented in a footnote to the cue set, as a line-item in the cue set, which was the equivalent of a balance sheet position, or incoporated into the debt/asset ratio. Responses were analyzed …

Go to article

Spectroscopic Studies Of Cobalt(Ii) Thiolates And Cobalt(Ii) - Substituted Metallothioneins., Barbara Ann Dixon Jan 1987

Spectroscopic Studies Of Cobalt(Ii) Thiolates And Cobalt(Ii) - Substituted Metallothioneins., Barbara Ann Dixon

LSU Historical Dissertations and Theses

Metallothioneins (MT) are widely occurring proteins characterized by low molecular weights and extremely high metal and sulfur content. Mammalian forms usually contain seven diamagnetic metal ions such as Zn(II) and/or Cd(II) and 20 cysteine residues. An understanding of the physiological role(s) of MT requires the elucidation of the nature and type of metal clusters, and the mechanism of assembly in MT. The stepwise incorporation of Co(II) ions into apo-metallothionein-2 from rabbit liver has been monitored by UV-visible absorption, low temperature magnetic circular dichroism (MCD), and EPR spectroscopies. Interpretation of the results has been facilitated by parallel spectroscopic studies of synthetic …

Go to article

Polypeptides: Conformational Transition And Complex Formation With Catechins And Procyanidins., Luanne Faith Tilstra Jan 1987

Polypeptides: Conformational Transition And Complex Formation With Catechins And Procyanidins., Luanne Faith Tilstra

LSU Historical Dissertations and Theses

Theoretical explanations of the $\alpha$-helix to coil transition which employ rotational isomeric state calculations are reviewed. Recent advances in this field include the development of similar fundamentals for the intramolecular antiparallel $\beta$-sheet to coil transition. This dissertation adds to the current body of knowledge by outlining a formularization to calculate the mean square end-to-end distance, $\langle{\rm r}\sp2\rangle\sb{\rm o},$ of a homopolypeptide for the transition from random coil to intramolecular antiparallel $\beta$-sheet conformation. The formularization is translated into a computer program in the C language and values of $\langle{\rm r}\sp2\rangle\sb{\rm o}$ are calculated for a number of different statistical weights. These …

Go to article

Generation, Migration, And Transportation Of Gas Contaminated Regions Of Drilling Fluid., Vicente Casariego Jan 1987

Generation, Migration, And Transportation Of Gas Contaminated Regions Of Drilling Fluid., Vicente Casariego

LSU Historical Dissertations and Theses

The control of high pressure gas encountered while drilling for hydrocarbon reservoirs is one of the more expensive and potentially dangerous problems of the oil producing industry. When the control of high pressure gas is not accomplished flow of gas from the formation to the wellbore occurs. Once detected, the gas influx is stopped by shutting-in the well. This is the first measure taken in a series of operations which are designed to bring back the well under control. These operations are referred to as well control procedures. Well control simulators are used both for evaluating well control procedures and …

Go to article

Nitrone Spin Traps For Biological Studies. (Volumes I And Ii)., William Reeves Huie Jan 1987

Nitrone Spin Traps For Biological Studies. (Volumes I And Ii)., William Reeves Huie

LSU Historical Dissertations and Theses

A variety of aldonitrones for spin-trapping investigations have been synthesized, purified, and characterized. The alicyclic 5-member ring nitrones 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) and 3,3,5,5-tetramethyl-1-pyrroline-N-oxide (TMPO) and its long-chain derivatives were prepared in 3 or 4 steps. The reaction steps involved a Michael addition to yield the $\gamma$-nitrocarbonyl compound, subsequent mild reduction with zinc and aqueous ammonium chloride to yield the cyclic intermediate nitrone, a Grignard addition reaction to give the hydroxylamine, and finally copper-catalyzed aerial oxidation of the hydroxylamine to provide the aldonitrone. Poor overall yields were obtained. In contrast, the acyclic aromatic nitrone $\alpha$-phenyl-N-tert-butyl nitrone (PBN) and its derivatives were prepared …

Go to article

The Impact Of Comprehensive Allocation And Flow-Through Method Of Accounting For The Income Taxes On The Investment Decision: A Field Experiment., Zafar Ullah Khan Jan 1987

The Impact Of Comprehensive Allocation And Flow-Through Method Of Accounting For The Income Taxes On The Investment Decision: A Field Experiment., Zafar Ullah Khan

LSU Historical Dissertations and Theses

The purpose of this study was to determine whether investment decisions are affected by (1) alternative methods of accounting for income taxes and (2) the magnitude of deferred tax credits in the balance sheet. Financial analysts were asked to estimate net income and stock price, and to provide equivalence intervals as measures of uncertainty. The subjects based their predictions upon financial statements of a real company and selected financial information. Six different forms of the information cue set were used--three accounting methods (deferred method of comprehensive allocation, flow-through, and flow-through with footnote disclosure of deferred taxes as under the deferred …

Go to article

Structure Analysis Of Molybdenum, Osmium, And Iridium Organometallic Compound And Of An Organic Charge-Transfer Salt., Ju-Chun Wang Jan 1987

Structure Analysis Of Molybdenum, Osmium, And Iridium Organometallic Compound And Of An Organic Charge-Transfer Salt., Ju-Chun Wang

LSU Historical Dissertations and Theses

The crystal and molecular structures of four compounds have been determined by X-ray diffraction. Red crystals of 2,6-bis (1-(2,2-dimethylpropanimino)ethyl) pyridine tetracarbonylmolybdenum(0), Mo(CO)$\sb4$(C$\sb{19}$N$\sb3$H$\sb{31}),$ are orthorhombic, Pbca, Z = 8, a = 16.625(6), b = 17.185(3), c = 17.438(3) A; R = 0.0375 over 317 variables and 1454 observed reflections. Mo coordination is distorted octahedral with the organic ligand bonded to the metal at two of three possible Lewis base sites. Crystals of bis(triphenylphosphine)carbonyl (2,2-dicyanoethylidenamino)iridium(I), Ir(PPh$\sb3$)$\sb2$(CO)(C$\sb4$N$\sb3$), are triclinic, P1, Z = 2, a = 11.615(9), b = 12.562(9), c = 16.976(12) A, $\alpha$ = 91.24(7), $\beta$ = 99.46(5), $\gamma$ = 114.91(6)$\sp\circ$; R …

Go to article

Intracellular Calcium And Sodium In Hypertensive Patients, Richard S. Cooper, Nasreen Shamsi, Sherry Katz Jan 1987

Intracellular Calcium And Sodium In Hypertensive Patients, Richard S. Cooper, Nasreen Shamsi, Sherry Katz

Faculty Publications

Untreated subjects with mild to moderate hypertension were compared with normotensive controls recruited from the same ambulatory screening clinic. All subjects were black. Resting levels of cytosolic free calcium were estimated in washed platelets with the fluorescent intracellular probe fura 2, and sodium and potassium were measured in red blood cells. Calcium levels were 21 % higher in the hypertensive subjects (p = 0.02), and a 9% increase in sodium was observed in an expanded sample (p = 0.04). Neither intracellular calcium nor intracellular sodium had a significant linear correlation with blood pressure when hypertensive subjects and controls were examined …

Go to article

Use Of Multiple Time Series Analysis To Forecast Maintenance Manhour Requirement For The Chemical Process Industry., Helen Bostock Jan 1987

Use Of Multiple Time Series Analysis To Forecast Maintenance Manhour Requirement For The Chemical Process Industry., Helen Bostock

LSU Historical Dissertations and Theses

It is hypothesized that chemical processing plant maintenance manhour requirement (the number of hours required to maintain a production facility at an optimal level) can be forecast. The hypothesis is supported by (1) a study of the independent variables which may impact the dependent variable, maintenance manhour requirement and (2) a comparative analysis of technological forecasting methods that suggested which methods might be most appropriate. Both econometric and statistical forecasting methods were considered. The philosophy inherent in each approach was recognized. A procedure for choosing a forecasting method to suit a given situation is outlined. Multiple time series analysis, supported …

Go to article

The Cemetery As A Cultural Manifestation: Louisiana Necrogeography., Tadashi Nakagawa Jan 1987

The Cemetery As A Cultural Manifestation: Louisiana Necrogeography., Tadashi Nakagawa

LSU Historical Dissertations and Theses

Cultural geography, in order to advance as a science, must stand on a deductive theory which is subject to empirical tests. This study establishes a scientific theory for geographical interpretation of cultural landscape by using Louisiana cemeteries as empirical objects. Based upon the assumption that, ultimately, only individual men can play a causative role in the creation of the cemetery landscape, a theory is constructed by examining man's action modeled on the practical syllogism. Operationally defined, culture is the expression of the individual's voluntary group identity that can be identified by comparing groups. A variety of group identities which are …

Go to article

New Patterns In Atomic Spectra, A. R.P. Rau Jan 1987

New Patterns In Atomic Spectra, A. R.P. Rau

Faculty Publications

No abstract provided.

Go to article

The Danish Cadastral Survey Of St. Croix, 1733-1754 (Virgin Islands)., Daniel Price Hopkins Jan 1987

The Danish Cadastral Survey Of St. Croix, 1733-1754 (Virgin Islands)., Daniel Price Hopkins

LSU Historical Dissertations and Theses

This dissertation presents the history of the original cadastral survey of St. Croix by the Danish West India and Guinea Company in the early eighteenth century. St. Croix, the largest of the United States Virgin Islands, is distinguished by a remarkably regular and rectangular pattern of roads and properties, which appears to have had no parallel in the Lesser Antilles or Denmark. This is a case study of how colonial administrators approached the problem of the orderly alienation and demarcation of previously undivided land. The study is based mainly on original manuscript Company records in the Danish State Archive in …

Go to article

Effects Of Riverine Barriers On Genetic Differentiation Of Amazonian Forest Undergrowth Birds (Peru)., Angelo Paul Capparella Jan 1987

Effects Of Riverine Barriers On Genetic Differentiation Of Amazonian Forest Undergrowth Birds (Peru)., Angelo Paul Capparella

LSU Historical Dissertations and Theses

The high frequency with which rivers delimit phenotypically differentiated bird taxa is unique to Amazonia, where major rivers often form the boundaries between allospecies and subspecies pairs of understory terra firme forest birds. In contrast, many such forest species with life history traits similar to these differentiated forms show no variation in plumage across even the largest rivers. To determine whether such species are nonetheless genetically differentiated, I obtained tissue samples from populations of forest understory birds from opposite banks of the Napo and Amazon rivers of northeastern Peru. These included three species that are not phenotypically differentiated across the …

Go to article

The Impact Of The American Presence On Germans And German-American Grass Roots Relations In Germany, 1950-1960., Dewey Arthur Browder Jan 1987

The Impact Of The American Presence On Germans And German-American Grass Roots Relations In Germany, 1950-1960., Dewey Arthur Browder

LSU Historical Dissertations and Theses

This study is primarily concerned with the years 1950-1960, but the period 1945-1949 is also addressed, because many of the policies and institutions introduced to democratize Germany immediately after World War II were carried forward. The official position on both sides during the 1950s was that cooperation was of the essence. In the beginning, the Americans believed that the virtues of democracy could best be cultivated in the German consciousness if the Germans themselves implemented democratic programs under broad, philosophical guidelines, while simultaneously observing Americans and American ideas in practice. This study points out that the Germans accepted the guidelines …

Go to article

Cognitive Strategy Training Effects On Reading Comprehension In Learning-Disabled Readers., Erin Cuccia Agostini Jan 1987

Cognitive Strategy Training Effects On Reading Comprehension In Learning-Disabled Readers., Erin Cuccia Agostini

LSU Historical Dissertations and Theses

This study was conducted to investigate the hypothesis that learning disabled children with reading deficits demonstrate a "production deficiency" by failing to spontaneously employ appropriate cognitive strategies in reading situations. Moreover, it was anticipated that providing them with explicit instruction regarding these strategies would improve their comprehension. Thirty learning disabled seventh- and eighth-grade students were randomly assigned to one of three training conditions: (a) summarization, (b) self-questioning, and (c) control. The effectiveness of the training strategies was assessed by having students write an 80-word summary and answer a 10-item multiple choice comprehension test on each of two passages during three …

Go to article

Crime And Punishment In The Royal Navy: Discipline On The Leeward Islands Station, 1784-1812 (England)., John D. Byrn Jr Jan 1987

Crime And Punishment In The Royal Navy: Discipline On The Leeward Islands Station, 1784-1812 (England)., John D. Byrn Jr

LSU Historical Dissertations and Theses

This dissertation is based primarily on the manuscript sources pertaining to the Leeward Islands station between 1784 and 1812 found in the Public Record Office. Its thesis is quite simple: Discipline in the Royal Navy in the age of sail was maintained in much the same fashion that law and order was enforced in the localities of eighteenth-century England. In short, justice afloat was administered according to the principles and practices used in the system of criminal law ashore.

Go to article

First Prev Next Last