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

Physical Sciences and Mathematics Commons™

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

2009

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 4861 - 4890 of 7615

Full-Text Articles in Physical Sciences and Mathematics

Nitric Oxide Synthase In Confined Environments;Detection And Quantification Of Nitric Oxide Released From Cells And Modified Liposomes Using A Sensitive Metal Catalyst-Pedot Modified Carbon Fiber Electrode, P. A. Reshani H. Perera Jan 2009

Nitric Oxide Synthase In Confined Environments;Detection And Quantification Of Nitric Oxide Released From Cells And Modified Liposomes Using A Sensitive Metal Catalyst-Pedot Modified Carbon Fiber Electrode, P. A. Reshani H. Perera

ETD Archive

Nitric oxide (NO) is a freely diffusible, gaseous free radical, associated with many physiological and pathological processes that include neuronal signaling, immune response, and inflammatory response. NO is produced from L-arginine in an NADPH-dependent reaction catalyzed by a family of nitric oxide synthase (NOS) enzymes. A deficiency in NO plays a role in hypertension, hyperglycaemia, and arteriosclerosis, among other pathological states. Conversely, increased NO levels contribute to arthritis, septic shock, and hypotention. Therefore, measuring and quantifying NO production in biological systems and matrices may be vital in elucidating physiological and pathological processes. The goal of this work is to develop …

Go to article

Development Of A Novel Gradient Chromatofocusing Tandem Mass Spectometry Technique For The Determination Of Cationic Compounds In Biofluids;Identification Of Caspace 3 Cleavage Sites Of Nhe-1 By High Performance Liquid Chromatography- Mass Spectrometry, Jianhua Tang Jan 2009

Development Of A Novel Gradient Chromatofocusing Tandem Mass Spectometry Technique For The Determination Of Cationic Compounds In Biofluids;Identification Of Caspace 3 Cleavage Sites Of Nhe-1 By High Performance Liquid Chromatography- Mass Spectrometry, Jianhua Tang

ETD Archive

In Part I, work was done to develop a novel gradient chromatofocusing liquid chromatography-tandem mass spectrometry (MS/MS) technique for the determination of ionic compounds in biological matrix. The analysis of ionic compounds poses a great challenge to current LC-MS techniques, due to the fact that there is little or no retention. These ionic compounds are eluted at almost the same time as biological matrix, which is normally directed to waste prior to connecting to the mass spectrometer. A review of current LC-MS techniques for ionic compounds is given in Chapter 1. They all have advantages and disadvantages. To retain and …

Go to article

Rat Population Assessment And Control In Eastern Suburbs Of Cleveland, Ohio, James W. Coates Jan 2009

Rat Population Assessment And Control In Eastern Suburbs Of Cleveland, Ohio, James W. Coates

ETD Archive

The Norway rat (Rattus norvegicus) is found to inhabit many urbanized areas needs to be controlled, given that it is a carrier of diseases and a source of economic damages. As harborage areas in suburbs, the rat prefers compost piles, cesspits, sewer systems, and basements that are near water. Norway rats prefer food sources such as waste disposal sites, unclean yards with trashcans, gardens, and slaughterhouses (Traweger and Slotta-Bachmayr 2004). The typical range for this species in an urban setting is 25-150 meters (27-164 yards). The research for this thesis was done in conjunction with the Cuyahoga County Board of …

Go to article

Plasma Biomarkers For Age-Related Macular Degeneration, Jiaqian Ni Jan 2009

Plasma Biomarkers For Age-Related Macular Degeneration, Jiaqian Ni

ETD Archive

No abstract provided.

Go to article

Title Page, Preface Jan 2009

Title Page, Preface

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Go to article

Understanding Teacher Leadership In Middle School Mathematics: A Collaborative Research Effort, J. E. Pustejovsky, J. P. Spillane, R. M. Heaton, W. J. Lewis Jan 2009

Understanding Teacher Leadership In Middle School Mathematics: A Collaborative Research Effort, J. E. Pustejovsky, J. P. Spillane, R. M. Heaton, W. J. Lewis

Journal of Mathematics and Science: Collaborative Explorations

We report findings from a collaborative research effort designed to examine how teachers act as leaders in their schools. We find that teachers educated by the Math in the Middle Institute act as key sources of advice for colleagues within their schools while drawing support from a network consisting of other teachers in the program and university-level advisors. In addition to reporting on our findings, we reflect on our research process, noting some of the practical challenges involved, as well as some of the benefits of collaboration.

Go to article

Building Middle-Level Mathematics Teachers' Capacities As Teachers And Leaders: The Math In The Middle Institute Partnership, R. M. Heaton, W. J. Lewis, W. M. Smith Jan 2009

Building Middle-Level Mathematics Teachers' Capacities As Teachers And Leaders: The Math In The Middle Institute Partnership, R. M. Heaton, W. J. Lewis, W. M. Smith

Journal of Mathematics and Science: Collaborative Explorations

This article describes professional development for middle-level mathematics teachers offered through the Math in the Middle Institute Partnership, a National Science Foundation-funded project to build teachers’ capacities to improve mathematics learning for all students. An overview of the project, including descriptions of its goals and curriculum are provided. Detailed descriptions of two mathematics courses and one pedagogy course are offered. The mathematics courses included here are the introductory course to the Math in the Middle Institute, as well as one of the final math courses of the Institute in which participants apply mathematical knowledge and processes to real-world problems. The …

Go to article

Developing Leadership In A National Cohort Of Secondary Biology Teachers: Uses Of An On-Line Course Structure To Develop Geographically Distant Professional Learning Community, P. Balcerzak, V. May, B. Schaal Jan 2009

Developing Leadership In A National Cohort Of Secondary Biology Teachers: Uses Of An On-Line Course Structure To Develop Geographically Distant Professional Learning Community, P. Balcerzak, V. May, B. Schaal

Journal of Mathematics and Science: Collaborative Explorations

This report is a descriptive study of the role that on-line courses might have on the development of Professional Learning Communities (PLC’s) that support national leadership initiatives of participating high school biology teachers. The one hundred teachers involved in the Life Sciences for a Global Community (LSGC) Institute are expected not only to deepen their content knowledge, but also impact their district and state biology curricula. Additionally, the dispersion of Institute participants across the country presents a unique opportunity to develop, communicate. and implement a national coherent reform agenda. However, the geographic distance presents a barrier to collaborative design of …

Go to article

The Impact Of Early Positive Results On A Mathematics And Science Partnership: The Experience Of The Institute For Chemistry Literacy Through Computational Science, K. S. Murray, M. A. Henry, M. C. Hogrebe Jan 2009

The Impact Of Early Positive Results On A Mathematics And Science Partnership: The Experience Of The Institute For Chemistry Literacy Through Computational Science, K. S. Murray, M. A. Henry, M. C. Hogrebe

Journal of Mathematics and Science: Collaborative Explorations

After one year of implementation, the Institute for Chemistry Literacy through Computational Science, an NSF Mathematics and Science Partnership Institute Project led by the University of Illinois at Urbana-Champaign’s Department of Chemistry, College of Medicine, and National Center for Supercomputing Applications, experienced statistically significant gains in chemistry content knowledge among students of the rural high school teachers participating in its intensive, year-round professional development course, compared to a control group. The project utilizes a two-cohort, delayed-treatment, random control trial, quasi-experimental research design with the second cohort entering treatment one year following the first. The three-year treatment includes intensive two-week summer …

Go to article

The Penn Science Teacher Institute: A Proven Model, C. Blasie, J. Butler-Kahle Jan 2009

The Penn Science Teacher Institute: A Proven Model, C. Blasie, J. Butler-Kahle

Journal of Mathematics and Science: Collaborative Explorations

The University of Pennsylvania’s Master of Chemistry Education (MCE) program graduated five cohorts of approximately twenty teachers between 2002 and 2006. One year after the teachers in the last cohort earned their degrees, the Penn Science Teacher Institute (Penn STI) initiated a follow-up study to ascertain if the goals of the MCE program had been sustained. For example, were the teachers incorporating updated content knowledge into their lessons and were their students learning more chemistry? A total of seventy-four of the eighty-two graduates participated in some aspect of this study. Because baseline data were not available for the MCE teachers …

Go to article

K-5 Mathematics Specialists' Teaching And Learning About Fractions, J. W. Whitenack, A. J. Ellington Jan 2009

K-5 Mathematics Specialists' Teaching And Learning About Fractions, J. W. Whitenack, A. J. Ellington

Journal of Mathematics and Science: Collaborative Explorations

This paper describes the fraction-based mathematical activities of two teachers who are part of 3 Mathematics Specialist preparation program. Their work with fractions is traced from two perspectives: 1) their interactions with students as they struggle with fraction concepts; and, 2) their personal journeys to develop deeper understandings of fractions as participants in the Rational Numbers course that is part of their degree program. Through their stories, we gain a better understanding of the complex nature of their work with students and how their participation in the Mathematics Specialist program helps support their work in the school buildings.

Go to article

Virginia's Mathematics Specialist Institute Project: A Summary Of Evaluation Findings, P. S. Smith, M. Wickwire Jan 2009

Virginia's Mathematics Specialist Institute Project: A Summary Of Evaluation Findings, P. S. Smith, M. Wickwire

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Go to article

The Impact Of The Lead Teacher Professional Learning Community Within The Rice University Mathematics Leadership Institute, J. Sack, N. Kamau Jan 2009

The Impact Of The Lead Teacher Professional Learning Community Within The Rice University Mathematics Leadership Institute, J. Sack, N. Kamau

Journal of Mathematics and Science: Collaborative Explorations

Now in its fourth year, Rice University’s Mathematics Leadership Institute (MLI) has developed over sixty high school mathematics Lead Teachers. We focus on how membership in MLI has impacted participant teachers’ professional lives. The Lead Teacher community that emerged during MLl’s first Summer Leadership Institute embodies the characteristics of a sustaining and coherent knowledge community where teachers are able to share their secret “stories of practice in safe places . . . in order to make their personal practical knowledge explicit to themselves and to others” [1]. This article includes stories of individual teachers who refused to sacrifice hours of …

Go to article

Formulating A State Approach To Professional Development, R. E. Howard, S. Sarani, J. Woods Jan 2009

Formulating A State Approach To Professional Development, R. E. Howard, S. Sarani, J. Woods

Journal of Mathematics and Science: Collaborative Explorations

When viewed from the perspective of an entire state's needs, the challenges of designing professional development to meet the requirements of the federal No Child Left Behind legislation of 2001 are daunting. In Oklahoma, the concerns about delivering to rural and urban populations which contain a variety of underserved populations are further complicated by the differences in the way science and mathematics are structured as disciplines. We describe two model programs, one in science and one in mathematics, which take much different approaches. However, the programs have three common elements that make them highly successful. Each program engages teachers strongly, …

Go to article

Mathematics Specialists Increasingly Appreciated And Sought, D. Blount, J. Singleton Jan 2009

Mathematics Specialists Increasingly Appreciated And Sought, D. Blount, J. Singleton

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Go to article

Understanding Elementary Teachers' Use Of Science Teaching Time: Lessons From The Big Sky Science Partnership, R. Jones, E. Swanson Jan 2009

Understanding Elementary Teachers' Use Of Science Teaching Time: Lessons From The Big Sky Science Partnership, R. Jones, E. Swanson

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Go to article

Contents Jan 2009

Contents

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Go to article

Let's Observe!, S. W. Brown Jan 2009

Let's Observe!, S. W. Brown

Journal of Mathematics and Science: Collaborative Explorations

Teaching the non-science major how to teach science is a challenge! No matter what science course is being taught, professors must model good teaching strategies that promote an inquiry approach that incorporates prior knowledge, connections, a social environment, relevance, and time to actively construct new understandings of scientific concepts.

Go to article

Aims & Scope Jan 2009

Aims & Scope

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Go to article

Journal Of Mathematics And Science: Collaborative Explorations Jan 2009

Journal Of Mathematics And Science: Collaborative Explorations

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

Go to article

Connecting Mathematics And The Applied Science Of Energy Conservation, R. E. Carbone, J. M. Pearce Jan 2009

Connecting Mathematics And The Applied Science Of Energy Conservation, R. E. Carbone, J. M. Pearce

Journal of Mathematics and Science: Collaborative Explorations

To effectively teach science in the elementary classroom, pre-service K-8 teachers need a basic understanding of the underlying concepts of physics, which demand a strong foundation in mathematics. Unfortunately, the depth of mathematics understanding of prospective elementary teachers has been a growing and serious concern for several decades. To overcome this challenge, a two-pronged attack was used in this study. First. students in mathematics courses were coupled with physical science courses by linking registration to ensure co-requisites were taken. This alone improved passing rates. Secondly, an energy conservation project was introduced in both classes that intimately tied the theoretical mathematics …

Go to article

Properties Of Matrix Variate Beta Type 3 Distribution, Arjun K. Gupta, Daya K. Nagar Jan 2009

Properties Of Matrix Variate Beta Type 3 Distribution, Arjun K. Gupta, Daya K. Nagar

Mathematics and Statistics Faculty Publications

We study several properties of matrix variate beta type 3 distribution. We also derive probability density functions of the product of two independent random matrices when one of them is beta type 3. These densities are expressed in terms of Appell’s first hypergeometric function F1 and Humbert’s confluent hypergeometric function Φ1 of matrix arguments. Further, a bimatrix variate generalization of the beta type 3 distribution is also defined and studied.

Go to article

Al13h−: Hydrogen Atom Site Selectivity And The Shell Model, A. Grubisic, X. Li, S. T. Stokes, K. Vetter, G. F. Ganteför, K. H. Bowen, P. Jena, B. Kiran, R. Burgert, H. Schnöckel Jan 2009

Al13h−: Hydrogen Atom Site Selectivity And The Shell Model, A. Grubisic, X. Li, S. T. Stokes, K. Vetter, G. F. Ganteför, K. H. Bowen, P. Jena, B. Kiran, R. Burgert, H. Schnöckel

Physics Publications

Using a combination of anion photoelectron spectroscopy and density functional theory calculations, we explored the influence of the shell model on H atom site selectivity in Al13H−. Photoelectron spectra revealed that Al13H− has two anionic isomers and for both of them provided vertical detachment energies (VDEs). Theoretical calculations found that the structures of these anionic isomers differ by the position of the hydrogen atom. In one, the hydrogen atom is radially bonded, while in the other, hydrogen caps a triangular face. VDEs for both anionic isomers as well as other energetic relationships were also calculated. Comparison of the measured versus …

Go to article

One Parameter Control Of The Size Of Iron Oxide Nanoparticles Synthesized In Reverse Micelles, M. D. Shultz, W. Braxton, C. Taylor, E. E. Carpenter Jan 2009

One Parameter Control Of The Size Of Iron Oxide Nanoparticles Synthesized In Reverse Micelles, M. D. Shultz, W. Braxton, C. Taylor, E. E. Carpenter

Chemistry Publications

Iron oxide nanoparticles were synthesized via reverse micelle methods. The initial iron concentration was varied, while maintaining all other parameters constant, in order to investigate the effect of the iron concentration on the resultant iron oxide nanoparticle size. Increasing the iron concentration from 0.125M to 0.5M yielded an increase in average nanoparticle diameter from 4.71 to 7.95 nm, as measured by transmission electron microscopy. Three other concentrations between 0.125M and 0.5M showed corresponding size variations, all with statistical significance. Magnetic characterization by vibrating sample magnetometry and powder x-ray diffraction was performed to verify proper phase and material. Further insight into …

Go to article

Modelling Groups Of Plausible Virtual Pedestrians, Christopher Peters, Cathy Ennis, Carol O'Sullivan Jan 2009

Modelling Groups Of Plausible Virtual Pedestrians, Christopher Peters, Cathy Ennis, Carol O'Sullivan

Articles

No abstract provided.

Go to article

Talking Bodies: Sensitivity To Desynchronization Of Conversations, Rachel Mcdonnell, Cathy Ennis, Simon Dobbyn, Carol O'Sullivan Jan 2009

Talking Bodies: Sensitivity To Desynchronization Of Conversations, Rachel Mcdonnell, Cathy Ennis, Simon Dobbyn, Carol O'Sullivan

Articles

In this article, we investigate human sensitivity to the coordination and timing of conversational body language for virtual characters. First, we captured the full body motions (excluding faces and hands) of three actors conversing about a range of topics, in either a polite (i.e., one person talking at a time) or debate/argument style. Stimuli were then created by applying the motion-captured conversations from the actors to virtual characters. In a 2AFC experiment, participants viewed paired sequences of synchronized and desynchronized conversations and were asked to guess which was the real one. Detection performance was above chance for both conversation styles …

Go to article

Effect Of Organic Chelates On The Performance Of Hybrid Sol–Gel Coated Aa2024-T3 Aluminium Alloys, Rajath Varma, John Colreavy, John Cassidy, Mohamed Oubaha, Colette Mcdonagh, Brendan Duffy Jan 2009

Effect Of Organic Chelates On The Performance Of Hybrid Sol–Gel Coated Aa2024-T3 Aluminium Alloys, Rajath Varma, John Colreavy, John Cassidy, Mohamed Oubaha, Colette Mcdonagh, Brendan Duffy

Articles

Sol–gels are organic–inorganic polymers formed by hydrolysis/condensation reactions of alkoxide precursors, primarily silanes, which have found applications as electronic, optical and protective coatings. These coatings possess important characteristics such as chemical stability, physical strength and scratch resistance. Further performance improvement is achieved through the incorporation of zirconium and titanium based nanoparticles, also formed through the sol–gel process. However due to the inherent difference in the reactivity of the precursors, the hydrolysis of each precursor must be carried out separately before being combined for final condensation. Zirconium precursors are commonly chelated using acetic acids, prior to hydrolysis, to lower the hydrolysis …

Go to article

Maintenance In Single-Server Queues: A Game-Theoretic Approach, Najeeb Al-Matar, Jewgeni H. Dshalalow Jan 2009

Maintenance In Single-Server Queues: A Game-Theoretic Approach, Najeeb Al-Matar, Jewgeni H. Dshalalow

Mathematics and System Engineering Faculty Publications

We use antagonistic stochastic games and fluctuation analysis to examine a single-server queue with bulk input and secondary work during server's multiple vacations. When the buffer contents become exhausted the server leaves the system to perform some diagnostic service of a minimum of jobs clustered in packets of random sizes (event A). The server is not supposed to stay longer than units of time (event B). The server returns to the system when A or B occurs, whichever comes first. On the other hand, he may not break service of a packet in a middle even if A or B …

Go to article

Generalized First-Order Nonlinear Evolution Equations And Generalized Yosida Approximations Based On H-Maximal Monotonicity Frameworks, Ram U. Verma Jan 2009

Generalized First-Order Nonlinear Evolution Equations And Generalized Yosida Approximations Based On H-Maximal Monotonicity Frameworks, Ram U. Verma

Mathematics and System Engineering Faculty Publications

First a general framework for the Yosida approximation is introduced based on the relative H-maximal monotonicity model, and then it is applied to the solvability of a general class of first-order nonlinear evolution equations. The obtained results generalize and unify a wide range of results to the context of the solvability of first-order nonlinear evolution equations in several settings.© 2009 Texas State University-San Marcos.

Go to article

Redirected Free Exploration With Distractors, Tabitha C. Peck Jan 2009

Redirected Free Exploration With Distractors, Tabitha C. Peck

Link Foundation Modeling, Simulation and Training Fellowship Reports

Users in virtual environments often find navigation n1ore difficult than in the real world, Our new locomotion interface, Redirected Free Exploration with Distractors (RFED), enables users to walk in larger-than-tracked space VEs without predefined waypoints. RFED uses the concept of a distractor-an object, sound, or combination of object and sound in the VE that the user focuses on while the VE rotates, reducing perception of the rotation, and thus reducing the likelihood of a break in presence { 11 ]. We compared RFED to the current best interface, really walking, by conducting a user study 1neasuring navigational ability. Our results …

Go to article

First Prev Next Last