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Articles 3451 - 3480 of 5573
Full-Text Articles in Physical Sciences and Mathematics
The Attitudes Of Educators To Information Technology Adoption In Schools Settings, Manoj Maharaj, Wesley Govender
The Attitudes Of Educators To Information Technology Adoption In Schools Settings, Manoj Maharaj, Wesley Govender
Manoj Maharaj
No abstract provided.
Mathematical Modeling Of The Hypothalamic-Pituitary-Adrenal System Activity, Zeljko D. Cupic
Mathematical Modeling Of The Hypothalamic-Pituitary-Adrenal System Activity, Zeljko D. Cupic
Zeljko D Cupic
No abstract provided.
On Optimizing Multi-Level Designs: Power Under Budget Constraints, Todd C. Headrick, Bruno D. Zumbo
On Optimizing Multi-Level Designs: Power Under Budget Constraints, Todd C. Headrick, Bruno D. Zumbo
Todd Christopher Headrick
This paper derives a procedure for efficiently allocating the number of units in multi-level designs given prespecified power levels. The derivation of the procedure is based on a constrained optimization problem that maximizes a general form of a ratio of expected mean squares subject to a budget constraint. The procedure makes use of variance component estimates to optimize designs during the budget formulating stages. The method provides more general closed form solutions than other currently available formulae. As such, the proposed procedure allows for the determination of the optimal numbers of units for studies that involve more complex designs. A …
Five Dimensional 2-Branes From Special Lagrangian Wrapped M5-Branes, Moataz Emam
Five Dimensional 2-Branes From Special Lagrangian Wrapped M5-Branes, Moataz Emam
Moataz Emam
No abstract provided.
Review Of Sweet Dreams: Philosophical Obstacles To A Science Of Consciousness, Leslie Marsh
Review Of Sweet Dreams: Philosophical Obstacles To A Science Of Consciousness, Leslie Marsh
Leslie Marsh
The question of how a physical system gives rise to the phenomenal or experiential (olfactory, visual, somatosensitive, gestatory and auditory), is considered the most intractable of scientific and philosophical puzzles. Though this question has dominated the philosophy of mind over the last quarter century, it articulates a version of the age-old mind–body problem. The most famous response, Cartesian dualism, is on Daniel Dennett’s view still a corrosively residual and redundant feature of popular (and academic) thinking on these matters. Fifteen years on from his anti-Cartesian theory of consciousness (Consciousness Explained, 1991), Dennett’s frustration with this tradition is still palpable. This …
Stochastic Convergence Among European Economies, Mauro Costantini, Claudio Lupi
Stochastic Convergence Among European Economies, Mauro Costantini, Claudio Lupi
Claudio Lupi
The aim of this paper is to test the stochastic convergence in real per capita GDP for 15 European countries using non−stationary panel data approaches over the period 1950−2003. Cross−sectional dependence is assumed due to the existence of strong linkages among European economies. However, tests derived under the assumption of cross−sectional independence are also carried out for completeness and comparison. We also split the whole sample into two sub−periods (1950−1976, 1977−2003) in order to take into account the effects of the first oil crisis (1973−1974) and to evaluate the robustness of the statistical analysis. Our results offer little support to …
Altered Hydrology In Connecticut Watersheds Prioritized For Protection, Denise Burchsted
Altered Hydrology In Connecticut Watersheds Prioritized For Protection, Denise Burchsted
Denise Burchsted
The Nature Conservancy (TNC) has selected the Saugatuck, Salmon, Eight Mile, Mount Hope / Natchaug, and Hollenbeck River watersheds for priority protection in Connecticut. A number of threats, including altered hydrology, have been identified in these watersheds. This project has been designed to better understand that threat and provide some context for future protection or restoration of the hydrology within those watersheds. The definition of altered hydrology is problematic, as the time at which the watersheds are considered unaltered is ambiguous and historic data is often unavailable. In order to address that difficulty, this project used the following approach: 1. …
"Rassling The Hog": The Influence Of Correlated Item Error On Internal Consistency, Classical Reliability, And Congeneric Reliability, Joseph F. Lucke
"Rassling The Hog": The Influence Of Correlated Item Error On Internal Consistency, Classical Reliability, And Congeneric Reliability, Joseph F. Lucke
Joseph Lucke
The properties of internal consistency ($\alpha$), classical reliability ($\rho$), and congeneric reliability ($\omega$) for a composite test with correlated item error were analytically investigated. Possible sources of correlated item error are contextual effects, item bundles, and item models that ignore additional attributes or higher-order attributes. The relation between reliability and internal consistency is determined by the deviance from true-score equivalence. Reliability (classical or congeneric) is internal consistency plus the relative deviance from true-score equivalence. The influence of correlated item error on $\alpha$, $\rho$, and $\omega$ is conveyed strictly through the total item error covariance. As the total item error covariance …
Hunting The Living Dead: A 'Peso Problem' In Corporate Liabilities Data, Umberto Cherubini, Matteo Manera
Hunting The Living Dead: A 'Peso Problem' In Corporate Liabilities Data, Umberto Cherubini, Matteo Manera
Matteo Manera
Recent literature has pointed out that information asymmetries may be the reason for the poor performance of structural credit risk models to fit corporate bond data. It is well known in fact that these models lead to a strong understatement of the credit spread terms structure, particularly on the short maturity end. Possible explanations stem from strategic debt service behavior and, as discovered more recently, the problem of accounting transparency. This raises the possibility that some of these flaws could be reconducted to a sort of “peso problem”, i.e. that the market may ask for a premium in order to …
Modeling Factor Demand Systems With Sem And Var: An Empirical Comparison, Matteo Manera
Modeling Factor Demand Systems With Sem And Var: An Empirical Comparison, Matteo Manera
Matteo Manera
The empirical analysis of the economic interactions between factors of production, output and corresponding prices has received much attention over the last two decades. Most contributions in this area have agreed on the neoclassical principle of a representative optimizing firm and typically use theory-based structural equation models (SEM). A popular alternative to SEM is given by the vector autoregression (VAR) methodology. The most recent attempts to link the SEM approach with VAR analysis in the area of factor demands concentrate on single-equation models, whereas no effort has been devoted to compare these alternative approaches when a firm is assumed to …
Asymmetric Error Correction Models For The Oil-Gasoline Price Relationship, Margherita Grasso, Matteo Manera
Asymmetric Error Correction Models For The Oil-Gasoline Price Relationship, Margherita Grasso, Matteo Manera
Matteo Manera
The existing literature on price asymmetries does not systematically investigate the sensitivity of the empirical results to the choice of a particular econometric specification. This paper fills this gap by providing a detailed comparison of the three most popular models designed to describe asymmetric price behaviour, namely asymmetric ECM, autoregressive threshold ECM and ECM with threshold cointegration. Each model is estimated on a common monthly dataset for the gasoline markets of France, Germany, Italy, Spain and UK over the period 1985-2003. All models are able to capture the temporal delay in the reaction of retail prices to changes in spot …
Econometric Models Of Asymmetric Price Transmission, Giliola Frey, Matteo Manera
Econometric Models Of Asymmetric Price Transmission, Giliola Frey, Matteo Manera
Matteo Manera
In this paper we review the existing empirical literature on price asymmetries in commodities, providing a way to classify and compare different studies which are highly heterogeneous in terms of econometric models, type of asymmetries and empirical findings. Relative to the previous literature, this paper is novel in several respects. First, it presents a detailed and updated survey of the existing empirical contributions on the existence of price asymmetries in the transmission mechanism linking input prices to output prices. Second, this paper presents an extension of the traditional distinction between long-run and short-run asymmetries to new categories of asymmetries, such …
Oil Prices, Inflation And Interest Rates In A Sstructural Cointegrated Var Model For The G-7 Countries, Alessandro Cologni, Matteo Manera
Oil Prices, Inflation And Interest Rates In A Sstructural Cointegrated Var Model For The G-7 Countries, Alessandro Cologni, Matteo Manera
Matteo Manera
Sharp increases in the price of oil are generally seen as a major contributor to business cycle asymmetries. Moreover, the very recent highs registered in the world oil market are causing concern about possible slowdowns in the economic performance of the most developed countries. While several authors have considered the direct channels of transmission of energy price increases, other authors have argued that the economic downturns arose from the monetary policy response to the inflation presumably caused by oil price increases. In this paper a structural cointegrated VAR model has been considered for the G-7 countries in order to study …
Involvement Of Porin N,N-Dicyclohexylcarbodiimide-Reactive Domain In Hexokinase Binding To The Outer Mitochondrial Membrane, Philadelphia University
Involvement Of Porin N,N-Dicyclohexylcarbodiimide-Reactive Domain In Hexokinase Binding To The Outer Mitochondrial Membrane, Philadelphia University
Philadelphia University, Jordan
No abstract provided.
Modeling And Analysis Of An On Line Fms, Philadelphia University
Modeling And Analysis Of An On Line Fms, Philadelphia University
Philadelphia University, Jordan
No abstract provided.
Novel Technique To Control The Premature Infant Incubator System Using Ann, Philadelphia University
Novel Technique To Control The Premature Infant Incubator System Using Ann, Philadelphia University
Philadelphia University, Jordan
No abstract provided.
Rules Of Ownership Of Artificial Persons Of Intellectual Property Rights -Comparative Study Between Jordanian, & French Laws-, Philadelphia University
Rules Of Ownership Of Artificial Persons Of Intellectual Property Rights -Comparative Study Between Jordanian, & French Laws-, Philadelphia University
Philadelphia University, Jordan
No abstract provided.
The Role Of Knowledge Management In Enhancing The Competitiveness Of Small And Medium-Sized Enterprises (Smes), Philadelphia University
The Role Of Knowledge Management In Enhancing The Competitiveness Of Small And Medium-Sized Enterprises (Smes), Philadelphia University
Philadelphia University, Jordan
No abstract provided.
Solar Cooker Utilizing Satellite Dish Technology, Philadelphia University
Solar Cooker Utilizing Satellite Dish Technology, Philadelphia University
Philadelphia University, Jordan
No abstract provided.
Evaluation Technique In The Spi-Calculus For Cryptographic Protocols, Philadelphia University
Evaluation Technique In The Spi-Calculus For Cryptographic Protocols, Philadelphia University
Philadelphia University, Jordan
No abstract provided.
The State Of Engineering Postgraduate Studies In Iraqi Universities, Philadelphia University
The State Of Engineering Postgraduate Studies In Iraqi Universities, Philadelphia University
Philadelphia University, Jordan
No abstract provided.
An Approach Of Web Services Quality Attributes Specification, Philadelphia University
An Approach Of Web Services Quality Attributes Specification, Philadelphia University
Philadelphia University, Jordan
No abstract provided.
Unruly Complexity: Ecology, Interpretation, Engagement, Peter Taylor
Unruly Complexity: Ecology, Interpretation, Engagement, Peter Taylor
Peter Taylor
Ambitiously identifying fresh issues in the study of complex systems, Peter J. Taylor, in a model of interdisciplinary exploration, makes these concerns accessible to scholars in the fields of ecology, environmental science, and science studies. Unruly Complexity explores concepts used to deal with complexity in three realms: ecology and socio-environmental change; the collective constitution of knowledge; and the interpretations of science as they influence subsequent research. For each realm Taylor shows that unruly complexity-situations that lack definite boundaries, where what goes on "outside" continually restructures what is "inside," and where diverse processes come together to produce change-should not be suppressed …
Beamer By Example, Andrew Mertz, William Slough
Beamer By Example, Andrew Mertz, William Slough
Andrew Mertz
There are a variety of LaTeX classes which can be used to produce "overhead slides" for presentations. One of these, beamer, provides flexible and powerful environments which can be used to create slides and PDF-based documents suitable for presentations. Although the class is extensively documented, first-time users may prefer learning about this class using a collection of graduated examples. The examples presented here cover a wide spectrum of use, from the simplest static slides to those with dynamic effects.
Severe Wind And Fire Regimes In Northern Forests: Historic Variability At The Regional Scale, Lisa A. Schulte-Moore, David J. Mladenoff
Severe Wind And Fire Regimes In Northern Forests: Historic Variability At The Regional Scale, Lisa A. Schulte-Moore, David J. Mladenoff
Lisa A. Schulte Moore
Within the northern Great Lakes region, mesoscale (10s to 100s of km2) forest patterning is driven by disturbance dynamics. Using original Public Land Survey (PLS) records in northern Wisconsin, USA, we study spatial patterns of wind and fire disturbances during the pre-Euroamerican settlement period (ca. 1850). Our goals were: (1) to determine how effectively wind and fire disturbance can be econstructed from the PLS, (2) to assess the roles of wind and fire in shaping vegetation patterns, (3) to evaluate landscape to regional controls of wind and fire regimes, and (4) to assess the potential for interactions between these disturbances. …
The Ivory-Billed Woodpecker In Mississippi?, Stephen J. Dinsmore
The Ivory-Billed Woodpecker In Mississippi?, Stephen J. Dinsmore
Stephen J Dinsmore
In April the environmental community received a real surprise--the Ivory-billed Woodpecker, long thought to be extinct, had apparently been rediscovered in Arkansas! As the news unfolded, the world learned that a team of researchers had been tracking at least one woodpecker, a lone male, for more than a year in the Cache River region of east-central Arkansas. The rediscovery of a bird presumed extinct for more than 60 years subsequently galvanized the environmental community and garnered much-needed support for the preservation of the Southeast's remaining old growth bottomland forests and endangered species recovery.
Waterfowl Abundance And Distribution In The Mississippi Delta, Stephen J. Dinsmore, Aaron T. Pearse, Richard M. Kaminski, Kenneth J. Reinecke
Waterfowl Abundance And Distribution In The Mississippi Delta, Stephen J. Dinsmore, Aaron T. Pearse, Richard M. Kaminski, Kenneth J. Reinecke
Stephen J Dinsmore
During mornings of empty skies, a duck hunter has plenty of time to ponder the question, "Where are all the ducks?" Invariable, the distraught hunter arrives at an unhappy conclusion: the ducks are not going to show up, so they must be elsewhere. The typical progression of an unsuccessful morning of hunting leads to multiple explanations as to why there weren't any ducks, such as mild winter temperatures in and north of Mississippi, not enough rain to attract ducks, too much rain and the ducks are scattered, the region doesn't have enough food to attract and hold ducks, the ducks …
Hamiota, A New Genus Of Freshwater Mussel (Bivalvia: Unionidae) From The Gulf Of Mexico Drainages Of The Southeastern United States, Kevin J. Roe, Paul D. Hartfield
Hamiota, A New Genus Of Freshwater Mussel (Bivalvia: Unionidae) From The Gulf Of Mexico Drainages Of The Southeastern United States, Kevin J. Roe, Paul D. Hartfield
Kevin J. Roe
Hamiota, a new genus of freshwater mussel containing four species formerly assigned to the genus Lampsilis Rafinesque, 1820, is described. In addition to the genus Lampsilis, members of Hamiota had previously been placed in the genera Villosa Frierson, 1927, and Ligumia Swainson, 1840. Several characters including the packaging of their larvae in a superconglutinate lure to attract host fishes, placement and shape of the marsupia, and release of glochidia through the excurrent siphon, support the recognition of these species as a distinct genus.
Pre-Euroamerican Distribution Of Pine Warblers (Dendroica Pinus) In Wisconsin: A Tool For Setting Regional Conservation Priorities, Lisa A. Schulte, Anna M. Pidgeon, David J. Mladenoff
Pre-Euroamerican Distribution Of Pine Warblers (Dendroica Pinus) In Wisconsin: A Tool For Setting Regional Conservation Priorities, Lisa A. Schulte, Anna M. Pidgeon, David J. Mladenoff
Lisa A. Schulte Moore
A common goal of conservation and management plans is to maintain populations of species of conservation concern at some historic level that was a product of environmental conditions at a time when they were less influenced by humans than at present. Conservation planning also includes consideration of the distribution, abundance, and reproductive success of a species, all of which are affected by both the amount and spatial pattern of habitat. In this work, we have fused the fields of spatial and historical ecology to provide a perspective that includes an estimate of a bird species’ distribution just prior to Euroamerican …
Mechanism Of Structural Transformation In Bismuth Titanate, Sudhanshu Mallick, Keith J. Bowman, Alexander H. King
Mechanism Of Structural Transformation In Bismuth Titanate, Sudhanshu Mallick, Keith J. Bowman, Alexander H. King
Alexander H. King
Sodium-doped bismuth titanate undergoes a transformation from Bi4Ti3O12 to Na0.5Bi4.5Ti4O15 on heating in air at temperatures exceeding 800 °C. This transformation proceeds through the intermediate Na0.5Bi8.5Ti7O27 structure which is an intergrowth phase of the two. High-resolution transmission electron microscopy was used to study this transformation. From the Moiré pattern that was obtained, the crystallographic orientation of the transformation front has been determined and a mechanism is proposed for this structural transformation.