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2000

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Articles 2341 - 2370 of 2640

Full-Text Articles in Physical Sciences and Mathematics

Patterns In The Sand: Mathematical Exploration Of Chladni Patterns, A. M. Coughlin Jan 2000

Patterns In The Sand: Mathematical Exploration Of Chladni Patterns, A. M. Coughlin

Journal of Mathematics and Science: Collaborative Explorations

Chladni Patterns are formed when sand settles at the nodes of two dimensional standing waves, excited on a metallic plate which is driven at a resonant frequency. By considering a two-dimensional rectangular membrane with fixed boundary and constant density as an idealized model of the metal plate, a formula for predicting the Chladni Patterns that will form at certain frequencies can be found. In addition to mathematically exploring these mysterious patterns, I have created my own “Chladni Patterns” in the lab.

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What Does Research Suggest About Successful Programs For Women And Minorities?, D. R. Sterling Jan 2000

What Does Research Suggest About Successful Programs For Women And Minorities?, D. R. Sterling

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

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Bridges—Mathematics Support For Third-Grade Girls, J. M. Jarrell Jan 2000

Bridges—Mathematics Support For Third-Grade Girls, J. M. Jarrell

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

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A Simple Anharmonic Oscillator, K. Durlacher, J. Boyd, T. Didascalou Waterman Jan 2000

A Simple Anharmonic Oscillator, K. Durlacher, J. Boyd, T. Didascalou Waterman

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

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Aims & Scope Jan 2000

Aims & Scope

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

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Title Page Jan 2000

Title Page

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

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It's Fun, But Is It Science? Goals And Strategies In A Problem-Based Learning Course, M. S. Bruno, C. D. Jarvis Jan 2000

It's Fun, But Is It Science? Goals And Strategies In A Problem-Based Learning Course, M. S. Bruno, C. D. Jarvis

Journal of Mathematics and Science: Collaborative Explorations

All students at Hampshire College must complete a science requirement in which they demonstrate their understanding of how science is done, examine the work of science in larger contexts, and communicate their ideas effectively. Human Biology: Selected Topics in Medicine is one of 18-20 freshman seminars designed to move students toward completing this requirement. Students work in cooperative groups of 4-6 people to solve actual medical cases about which they receive information progressively. Students assign themselves homework tasks to bring information back for group deliberation. The goal is for case teams to work cooperatively to develop a differential diagnosis and …

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The Impact Of A National Science Foundation Collaborative For Excellence In Teacher Preparation On An Undergraduate Chemistry Course For Non-Chemistry Science Majors, J. Tyson Jan 2000

The Impact Of A National Science Foundation Collaborative For Excellence In Teacher Preparation On An Undergraduate Chemistry Course For Non-Chemistry Science Majors, J. Tyson

Journal of Mathematics and Science: Collaborative Explorations

In 1999 and 2000 Chemistry 312: Analytical Chemistry for non-chemistry science majors (taken in the junior or senior year), was revised as a result of the instructor’s involvements in the Center for Excellence in Teacher Preparation project and an NSF equipment grant. Changes included the introduction of a K-12 teaching requirement, more emphasis on co-operative learning and on inquiry-based exercises. These latter two pedagogical practices had more impact on the laboratory activities than on the classroom activities. Students in the laboratory were assigned defined roles in the groups and all groups undertook a three-week research project. Students’ responses to the …

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Integration Of Multimedia Interactive Web Tools With In-Class Active Learning, A. Ganz, K. Wongthavarawat, A. Phonphoem Jan 2000

Integration Of Multimedia Interactive Web Tools With In-Class Active Learning, A. Ganz, K. Wongthavarawat, A. Phonphoem

Journal of Mathematics and Science: Collaborative Explorations

In this paper, we present our experience with an introduction to engineering course in which we used a combination of active and collaborative teaching methods, multimedia web-based material, and web-based interactive tools. The students were engaged in active learning in class with methods such as demonstrations, hands-on work, and group work. After class, the students used the web-based material that we developed, such as multiple choice quizzes, interactive applets, and animations. We have also developed a number of web-based course management tools that were used by the course instructors. We conclude that both the students and instructors had a very …

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The Thayer Method: Student Active Learning With Positive Results, E. Connors Jan 2000

The Thayer Method: Student Active Learning With Positive Results, E. Connors

Journal of Mathematics and Science: Collaborative Explorations

Graduation from West Point requires successful completion of four courses in the mathematical sciences. These core mathematics courses include topics in discrete dynamical systems, differential and integral calculus (single variable and multivariable), differential equations, linear algebra, probability, and statistics. The instructional system employed throughout the core is the "Thayer Method," named for Colonel Sylvanus Thayer, "the Father of the Military Academy." In the Thayer Method, traces of cooperative education and "discovery learning" are evident. It is quintessential active learning. The West Point catalyst is the fundamental principle that cadets are responsible for their own education.

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Teaching Innovations In An Introductory Physics Course For Non-Science Majors, W. J. Mullin Jan 2000

Teaching Innovations In An Introductory Physics Course For Non-Science Majors, W. J. Mullin

Journal of Mathematics and Science: Collaborative Explorations

I have made several innovations to Physics 114: Physics of Sound, a course for Communication Disorders and General Education students at the University of Massachusetts. These changes include the use of a network of wireless communication devices called a Personal Response System, on-line tutorials and classnotes, a collaborative discussion section, exam corrections, microthemes, extra-credit papers, group extra-credit projects, and the use of student teaching assistants.

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Experiences And Thoughts On Stemtec-Inspired Changes In Teaching Physics For Life Science Majors, M. S. Z. Rabin Jan 2000

Experiences And Thoughts On Stemtec-Inspired Changes In Teaching Physics For Life Science Majors, M. S. Z. Rabin

Journal of Mathematics and Science: Collaborative Explorations

I have taught an introductory course for life science majors three times, each time introducing one or more teaching techniques discussed during the Science, Technology, Engineering, and Mathematics Teaching Education Collaborative (STEMTEC) meetings. Typical class size was 275 students. I cannot make quantitative statements about comparisons between the results of STEMTEC-type teaching methods and traditional teaching methods because I have never taught this course in a completely traditional lecture style. During the first year, I introduced conceptual questions into my lectures. The lecture would be interrupted several times with questions posed to the class. The students then had several minutes …

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Shaping Pre-Service Teachers' Attitudes: An Inquiry Approach To Course Reform, M. F. Neathery, B. Campbell, J. Chandler Jan 2000

Shaping Pre-Service Teachers' Attitudes: An Inquiry Approach To Course Reform, M. F. Neathery, B. Campbell, J. Chandler

Journal of Mathematics and Science: Collaborative Explorations

The purpose of the study was to investigate the development of pre-service teachers’ attitudes toward teaching science with inquiry methods as the result of their participation in the two-hour elementary science methods class. Southwestern Oklahoma State University is a partner in the Oklahoma Teacher Education Collaborative (OTEC) which is funded by the National Science Foundation’s reform effort, Collaboratives for Excellence in Teacher Preparation (CETP). The reform effort focuses on the revision of the teacher preparation courses with emphasis on a systemic change in the method in which math, science, and education methods courses are taught across Oklahoma. Nine Oklahoma universities, …

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The Impact Of A Summer Workshop: Staff Orientation At Mesa Community College, D. Sawada, J. Turley Jan 2000

The Impact Of A Summer Workshop: Staff Orientation At Mesa Community College, D. Sawada, J. Turley

Journal of Mathematics and Science: Collaborative Explorations

The Arizona Collaborative for Excellence in the Preparation of Teachers (ACEPT) is a National Science Foundation (NSF) funded project to reform teacher preparation in Arizona. One of the major modes for initiating both collaboration and reform between and among university and community college staff has been the Summer Faculty Enhancement Workshops developed and offered by ACEPT co-principal investigators each summer since 1996. The summer of 1999 featured five workshops, one of which was the Geology Summer Workshop which brought participants into close contact with eighteen reformed practices appropriate for large lecture style classes. One of the nineteen participants was Ray …

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Aims & Scope Jan 2000

Aims & Scope

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

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The Canonical Thermodynamic Formalism: Chaotic States Of Spin And Gauge Systems, Nerses Ananikian Jan 2000

The Canonical Thermodynamic Formalism: Chaotic States Of Spin And Gauge Systems, Nerses Ananikian

Turkish Journal of Physics

The three-site antiferromagnetic Ising, $Q$-state Potts $(Q

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Noncommutativity In String Theory And Large Extra Dimensions, Farhad Ardalan Jan 2000

Noncommutativity In String Theory And Large Extra Dimensions, Farhad Ardalan

Turkish Journal of Physics

Noncommutativity of space coordinates of string theory are reviewed and are related to the large extra dimension solution of the hierarchy problem.

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Steady States Of Dynamically Coupled Two-Species Systems, Muntasi̇r Barma, Sri̇ram Ramaswamy Jan 2000

Steady States Of Dynamically Coupled Two-Species Systems, Muntasi̇r Barma, Sri̇ram Ramaswamy

Turkish Journal of Physics

We study the steady states of two stochastic lattice models with two species of particles, where the local mobility of one species depends on the spatial distribution of the other. The eigenvalues of a $2\times 2$ matrix of couplings can develop imaginary parts, and the question arises whether this implies an instability to a macroscopically different steady state. In the first model, where the mobility depends on the local density of the other species, we show that the system undergoes macroscopic phase separation. In the second model, where the mobility depends on the second derivative of the density of the …

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Skyrmions From Harmonic Maps, Wojtek Zakrzewski Jan 2000

Skyrmions From Harmonic Maps, Wojtek Zakrzewski

Turkish Journal of Physics

We describe some relations between solitonic solutions of various models in different dimensions. We present some examples and then concentrate on some of our recent work (performed in collaboration with Ioannidou and Piette) \cite{IPZ} \cite{us2} which shows how some harmonic maps from $S^2$ to $CP^{N-1}$ can be used to find nontrivial spherically symmetric static solutions of the $SU(N)$ Skyrme model in 3 dimensions and to generate some of its low energy field configurations.

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The Effect Of Potassium Doping On Resistive Transitions And Transport Critical Current Of Bulk Ybco High-Tc Superconductors, S. Çelebi̇, A. Öztürk, İ. Karaca, U. Kölemen Jan 2000

The Effect Of Potassium Doping On Resistive Transitions And Transport Critical Current Of Bulk Ybco High-Tc Superconductors, S. Çelebi̇, A. Öztürk, İ. Karaca, U. Kölemen

Turkish Journal of Physics

We report on observations of the effect of potassium in YBCO (123) high temperature superconductors with nominal composition Y\( _{1-0,2x} \) Ba\( _{2-0.2x} \) K\( _{x} \) Cu\( _{3} \) O\( _{y} \). The electrical resistivity measurements show that the critical temperature T$_{c} \) (R=0) shifted slightly to lower temparature due to the K doping process. This process also decreases the transport critical current density and the activation energy for thermally activated flux flow. The magnetic field dependence of \( j_{c} \) was measured at 77 K after zero field cooling (ZFC) when the applied magnetic field is impressed (ZFCV) …

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Optical Properties Of Zns Thin Films, M. Y. Nadeem, Waqas Ahmed Jan 2000

Optical Properties Of Zns Thin Films, M. Y. Nadeem, Waqas Ahmed

Turkish Journal of Physics

Zinc sulfide (ZnS) thin films of different thickness were deposited on Corning 7059 glass substrate at room temperature and high vacuum using resistive heating technique. The film properties investigated include their absorbance / transmittance / reflectance spectra, band gap, refractive index, extinction coefficient, optical conductivity, complex dielectric constant and thickness. The films were found to exhibit high transmittance (60-99\%), low absorbance and low reflectance in the visible / near infrared region up to 1100 nm. However, the absorbance of the films was found to be high in the ultra violet region with peak around 360 nm. The thickness (using quartz …

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Characterization Of Phenanthrene Single Crystals, M. Tariq Bhatti, Anwar Manzoor Rana, Mazhar Ali, Gul N. Shahid, M. Saleh Jan 2000

Characterization Of Phenanthrene Single Crystals, M. Tariq Bhatti, Anwar Manzoor Rana, Mazhar Ali, Gul N. Shahid, M. Saleh

Turkish Journal of Physics

Single crystals of phenanthrene were successfully grown from melt using Bridgeman Crystal Growth System Type 365. The starting material was purified by sublimation and zone refining techniques in specially designed crystal growth tubes. Phenanthrene single crystals grow with the plane of maximum growth corresponding to the ab-crystallographic plane, and cleave readily in this plane. The optical absorption spectra of phenanthrene single crystals and phenanthrene crystals dissolved in benzene, alcohol and acetone solutions were studied in the wavelength range (200 - 400 nm). The optical excitations i.e., \( \pi - \pi^{*} \) transitions, are attributed to the weak and strong optical …

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Book Review: The Birth Of Time: How Astronomers Measured The Age Of The Universe, T. D. Oswalt Jan 2000

Book Review: The Birth Of Time: How Astronomers Measured The Age Of The Universe, T. D. Oswalt

Publications

This document is Dr. Oswalt’s review of The Birth of Time : How Astronomers Measured the Age of the Universe by John Gribbin. Yale, 2000 237p, 0-300-08346-7 $22.50.

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The Effect Of Rock Creep On The Morphology Of Steep-Sloped Sections Of The Niagara Escarpment (Ontario), John Barlow Jan 2000

The Effect Of Rock Creep On The Morphology Of Steep-Sloped Sections Of The Niagara Escarpment (Ontario), John Barlow

Theses and Dissertations (Comprehensive)

The thesis addresses the post-glacial development of the Niagara Cuesta between Hamilton and Collingwood. Conventional thinking on the escarpment during the Holocene suggests that the present morphology developed rapidly following deglaciation due to periglacial processes (Straw, 1966/Tovell 1992). The disruption of the preglacial drainage pattern by drift has meant the escarpment has not been subject to extensive fluvial action along its base, resulting in an extremely slow rate of retreat (Bird, 1980). The concept that the escarpment is a relict feature therefore pervades the modem literature. The apparent motion of the blocks at the face of the escarpment (Hintz, I997) …

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Lsmac And Lsnait: Two Approaches For Cluster-Based Scalable Web Servers, Xuehong Gana, Trevor Schroeder, Steve Goddard, Byrav Ramamurthy Jan 2000

Lsmac And Lsnait: Two Approaches For Cluster-Based Scalable Web Servers, Xuehong Gana, Trevor Schroeder, Steve Goddard, Byrav Ramamurthy

School of Computing: Conference and Workshop Papers

Server responsiveness and scalability are more important than ever in today’s client/server dominated network environments. Recently, researchers have begun to consider cluster-based computers using commodity hardware as an alternative to expensive specialized hardware for building scalable Web servers. In this paper, we present performance results comparing two cluster-based Web servers based on different server infrastructures: MAC-based dispatching (LSMAC) and IP-based dispatching (LSNAT). Both cluster-based server systems were implemented as application-space programs running on commodity hardware. We point out the advantages and disadvantages of both systems. We also identify when servers should be clustered and when clustering will not improve performance.

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Virtual Topology Reconfiguration Of Wavelength-Routed Optical Wdm Networks, Byrav Ramamurthy, Ashok Ramakrishnan Jan 2000

Virtual Topology Reconfiguration Of Wavelength-Routed Optical Wdm Networks, Byrav Ramamurthy, Ashok Ramakrishnan

School of Computing: Conference and Workshop Papers

The bandwidth requirements of the Internet are increasing every day and there are newer and more bandwidth-thirsty applications emerging on the horizon. Wavelength division multiplexing (WDM) is the next step towards leveraging the capabilities of the optical fiber, especially for wide-area backbone networks. The ability to switch a signal at intermediate nodes in a WDM network based on their wavelengths is known as wavelength-routing. One of the greatest advantages of using wavelength-routing WDM is the ability to create a virtual topology different from the physical topology of the underlying network. This virtual topology can be reconfigured when necessary, to improve …

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Optical Communication Networks For The Next-Generation Internet, Arun K. Somani, Byrav Ramamurthy Jan 2000

Optical Communication Networks For The Next-Generation Internet, Arun K. Somani, Byrav Ramamurthy

School of Computing: Faculty Publications

Computer and telecommunication networks are changing the world dramatically and will continue to do so in the foreseeable future. The Internet, primarily based on packet switches, provides very flexible data services such as e-mail and access to the World Wide Web. The Internet is a variable-delay, variable- bandwidth network that provides no guarantee on quality of service (QoS) in its initial phase. New services are being added to the pure data delivery framework of yesterday. Such high demands on capacity could lead to a “bandwidth crunch” at the core wide-area network, resulting in degradation of service quality. Fortunately, technological innovations …

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Isotopic Signature Of Burial Diagenesis And Primary Lithological Contrasts In Periplatform Carbonates (Miocene, Great Bahama Bank), Tracy D. Frank, Karin Bernet Jan 2000

Isotopic Signature Of Burial Diagenesis And Primary Lithological Contrasts In Periplatform Carbonates (Miocene, Great Bahama Bank), Tracy D. Frank, Karin Bernet

Department of Earth and Atmospheric Sciences: Faculty Publications

The stable isotope geochemistry of Miocene sediments from the leeward margin of the Great Bahama Bank was examined to investigate burial diagenetic processes in periplatform carbonates. Data indicate that, in addition to differences in bulk proportions of neritic and pelagic carbonate along the slope, rhythmic variation in primary carbonate content has controlled patterns of burial diagenesis and associated geochemical signatures throughout much of the succession examined. The present study focuses on Ocean Drilling Program Sites 1006 and 1007, the most distal of five sites drilled from marginal to deep basin environments during Leg 166. These Miocene sections are characterized by …

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Preliminary Results Of Bitumen And Whole-Rock Elemental Analyses Of Crp-2/2a, Victoria Land Basin, Antarctica, Richard Kettler, E. Papastavros Jan 2000

Preliminary Results Of Bitumen And Whole-Rock Elemental Analyses Of Crp-2/2a, Victoria Land Basin, Antarctica, Richard Kettler, E. Papastavros

Department of Earth and Atmospheric Sciences: Faculty Publications

Sediments and rocks recovered in CRP-2/2A coring operations contain relatively little organic matter (average TOC=0.28%) and very small amounts of solvent-soluble organic matter. Because Early Oligocene sediment included significant amounts of coal detritus, TOC values are higher in Early Oligocene rocks than in younger rocks. TOC values are highest in the fine-grained rocks deposited as part of the highstand systems tract (HST) and TOC values decrease from the bottom to the top of the HST. The TOC:TN ratios observed in the CRP-2/2A core typically exceed 10, and are strong evidence that the preserved organic matter comprises a mixture of detrital …

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Laser-Derived, Particle Size Data From Crp-2/2a: Implications For Sequence And Seismic Stratigraphy, K J. Woolfe, L K. Stewart, Christopher R. Fielding, M Lavelle Jan 2000

Laser-Derived, Particle Size Data From Crp-2/2a: Implications For Sequence And Seismic Stratigraphy, K J. Woolfe, L K. Stewart, Christopher R. Fielding, M Lavelle

Department of Earth and Atmospheric Sciences: Faculty Publications

Gravel-free, high-resolution (1-metre spacing, 32 channel) particle size data from the CRP-2/2A drill core indicate that many of the diamictites were likely deposited from floating ice. Textural dislocations occur at most sequence boundaries and provide independent corroboration of the sequence stratigraphic interpretation. Likewise the data largely support the correlation drawn (Fielding et al., this volume) between the sequence stratigraphic cycles and the regional seismic stratigraphy (an alternative correlation to Reflector ‘f’ is also suggested). The gravel-free data appear to be reflecting predominantly regional (global?) forcing with some possible local effects, and long-term trends persisting through gravelly textural dislocations.

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