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1999

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Articles 1921 - 1950 of 2348

Full-Text Articles in Physical Sciences and Mathematics

Journal Of Mathematics And Science: Collaborative Explorations Jan 1999

Journal Of Mathematics And Science: Collaborative Explorations

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

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Title Page Jan 1999

Title Page

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

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Contents Jan 1999

Contents

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

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Journal Of Mathematics And Science: Collaborative Explorations Jan 1999

Journal Of Mathematics And Science: Collaborative Explorations

Journal of Mathematics and Science: Collaborative Explorations

No abstract provided.

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Challenges For Science And Mathematics Faculty, S. T. Thornton Jan 1999

Challenges For Science And Mathematics Faculty, S. T. Thornton

Journal of Mathematics and Science: Collaborative Explorations

The increased science and mathematics teacher licensure requirements for K-8 teachers are clearly necessary to prepare teachers to appropriately teach the new Virginia SOLs [1]; The expectations of a program equivalent to 12 hours of science and 12 hours of mathematics for the PreK-6 endorsement and the 21 hours each of math and science to teach middle school math and science must be chosen very carefully indeed if future teachers are to be prepared to teach the specific SOL content, as well as "practical applications and the use of appropriate technology“. Most Virginia colleges and universities are not currently offering …

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A New Interdisciplinary Mathematics And Science Course, P. E. Mcneil Jan 1999

A New Interdisciplinary Mathematics And Science Course, P. E. Mcneil

Journal of Mathematics and Science: Collaborative Explorations

As Norfolk State University has been considering how to adequately prepare students to teach the challenging new mathematics and science called for the Virginia Standards of Learning [1], we have reached the conclusion that the student programs need to provide interdisciplinary experiences linking mathematics and science. We reached the conclusion for two reasons. First, even with the larger number of courses called for in the new licensure regulations, there are not enough course hours available to teach all of the different mathematics and science topics that future teachers need to have studied. Second, elementary and middle school students do not …

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Higher Education's Greatest Current Opportunity And Responsibility, R. F. Watson Jan 1999

Higher Education's Greatest Current Opportunity And Responsibility, R. F. Watson

Journal of Mathematics and Science: Collaborative Explorations

Preparing the next generation of teachers at all levels from kindergarten through college is higher education’s greatest current opportunity. Getting it right may be our greatest challenge. The face of science and technology is by definition changing constantly. Today, many feel that the most important work in science is going on increasingly at and across the interfaces of the traditional discipline. To serve our society well, education in the sciences, mathematics, engineering, and technology must change accordingly. In my view, curricula at all levels (K-16) too often continue to reflect only the narrow traditional disciplinary approaches that science has taken …

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Third International Mathematics And Science Study (Timss) And The Nature Of College Courses, D. R. Sterling Jan 1999

Third International Mathematics And Science Study (Timss) And The Nature Of College Courses, D. R. Sterling

Journal of Mathematics and Science: Collaborative Explorations

The TIMSS report leads to some strong conclusions concerning the effectiveness of various approaches for teaching mathematics and science in grades K-8. This presentation will focus on a description of the findings of TlMSS concerning effective teaching. Although the TIMSS study and its findings relate directly to teaching prior to college, the findings do have a lot to say about effective teaching at the college level. At the very least, they describe the type of teaching and learning that future teachers must experience if they are to bring about this type of learning in their own courses.

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A Field Based Approach To Introductory Geology Instruction, G. R. Woodwell, J. L. Hayob Jan 1999

A Field Based Approach To Introductory Geology Instruction, G. R. Woodwell, J. L. Hayob

Journal of Mathematics and Science: Collaborative Explorations

As part of the NSF-funded VCEPT project, geology faculty at Mary Washington College have developed and pilot tested a two-semester sequence of geology courses which are taught in a non-traditional, discovery oriented style. The guiding philosophy of the course development is to ensure that students learn about geological principles through collaborative learning in a variety of field settings that were carefully chosen to provide good examples of a range of geologic processes and environments. The design goals of these courses include improvement in student retention of concepts, increased student interest in earth science, improved critical thinking skills and the promotion …

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An Investigative Approach To Teaching Mathematics: Excitement And Concerns Of K-8 Preservice Teachers, J. L. M. Wilkins Jan 1999

An Investigative Approach To Teaching Mathematics: Excitement And Concerns Of K-8 Preservice Teachers, J. L. M. Wilkins

Journal of Mathematics and Science: Collaborative Explorations

Following from the recommendations of the National Council of Teachers of Mathematics, an Investigative Approach (IA) to teaching mathematics encourages students to explore real-world problems through hands-on activities instead of focusing on rote memorization of facts, formulas, and procedures. This paper discusses thirty-two K-8 preservice teachers‘ responses to questions regarding excitements and concerns about using this method of teaching. Although most preservice teachers are excited about the prospects of using this approach in their future classrooms, some exhibit hesitations related to concerns about time constraints and their own math abilities. A mathematics methods course presently being taught that is centered …

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A Comparison Of Observations And Model Simulations Of NoX/NoY In The Lower Stratosphere, R. S. Gao, D. W. Fahey, L. A. Del Negro, Stephen G. Donnelly Ph.D., E. R. Keim, J. A. Neuman, E. Teverovskaia, P. O. Wennberg, T. F. Hanisco, E. J. Lanzendorf, M. H. Proffitt, J. J. Margitan, J. C. Wilson, J. W. Elkins, R. M. Stimpfle, R. C. Cohen, C. T. Mcelroy, T. P. Bui, R. J. Salawitch, S. S. Brown, A. R. Ravishankara, R. W. Portmann, M. K.W. Ko, D. K. Weisenstein, P. A. Newman Jan 1999

A Comparison Of Observations And Model Simulations Of NoX/NoY In The Lower Stratosphere, R. S. Gao, D. W. Fahey, L. A. Del Negro, Stephen G. Donnelly Ph.D., E. R. Keim, J. A. Neuman, E. Teverovskaia, P. O. Wennberg, T. F. Hanisco, E. J. Lanzendorf, M. H. Proffitt, J. J. Margitan, J. C. Wilson, J. W. Elkins, R. M. Stimpfle, R. C. Cohen, C. T. Mcelroy, T. P. Bui, R. J. Salawitch, S. S. Brown, A. R. Ravishankara, R. W. Portmann, M. K.W. Ko, D. K. Weisenstein, P. A. Newman

Chemistry Faculty Publications

Extensive airborne measurements of the reactive nitrogen reservoir (NOy) and its component nitric oxide (NO) have been made in the lower stratosphere. Box model simulations that are constrained by observations of radical and long-lived species and which include heterogeneous chemistry systematically underpredict the NOx (= NO + NO2) to NOy ratio. The model agreement is substantially improved if newly measured rate coefficients for the OH + NO2 and OH + HNO3 reactions are used. When included in 2-D models, the new rate coefficients significantly increase the calculated ozone loss due to NOx and modestly change the calculated ozone abundances in …

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Note On The Voltammetry Of Ferrocene Carboxylate In Aqueous Solution, John Cassidy, John O'Gorman, M. Ronane, Enda Howard Jan 1999

Note On The Voltammetry Of Ferrocene Carboxylate In Aqueous Solution, John Cassidy, John O'Gorman, M. Ronane, Enda Howard

Articles

Cyclic voltammetry of ferrocene dicarboxylate in aqueous solutions at high pH, in the presence of oxygen, showed evidence of an EC' mechanism where the oxidised form of ferrocene dicarboxylate reacts with H02- , which had been produced at a lower potential. However, an analogous experiment with ferrocene carboxylate yielded a cyclic voltammogram with a post peak: following the anodic peak: for ferrocene carboxylate. The reason for the post peak: is not clear but may be due to a delay in the reaction between the oxidised form of ferrocene carboxylate and H02-.

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Infectious Necrotizing Enteritis And Mortality Caused By Vibrio Carachariae In Summer Flounder Paralichthys Dentatus During Intensive Culture, Bruno Soffientino, Todd Gwaltney, David R. Nelson, Jennifer L. Specker, Michael Mauel, Marta Gomez-Chiarri Jan 1999

Infectious Necrotizing Enteritis And Mortality Caused By Vibrio Carachariae In Summer Flounder Paralichthys Dentatus During Intensive Culture, Bruno Soffientino, Todd Gwaltney, David R. Nelson, Jennifer L. Specker, Michael Mauel, Marta Gomez-Chiarri

Fisheries, Animal and Veterinary Sciences Faculty Publications

An epizootic causing mortality among cultured summer flounder Paralichthys dentatus occurred in summer of 1998 at a land-based facility on Narragansett Bay, Rhode Island, USA. The disease, flounder infectious necrotizing enteritis (FINE), was characterized by reddening around the anal area, distended abdomens filled with opaque serosanguineous fluid, enteritis and necrosis of the posterior intestine. In extreme cases of the disease, the posterior intestine was detached from the anus and was observed coming out the vent. The intestine of individuals that recovered from the dsease ended in a blind-sac; the abdomens of these fish were distended, due to food and water …

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Using Spatial Systems To Establish Priorities For Catchment Management, David Deeley, David Weaver, J Hick Jan 1999

Using Spatial Systems To Establish Priorities For Catchment Management, David Deeley, David Weaver, J Hick

Conference papers and presentations

Priorities for catchment management can be established based on either, an objective assessment of relative priorities throughout the catchment, or by simply responding to crises associated with particular land uses and their sectional interests. While the latter method can have advantages in terms of establishing community good will, team cohesion, and a sense of achievement for particular sectional interests, it may have shortcomings in terms of a more objective and rational assessment of the relative magnitude and hence priority of land management problems. Spatial modelling using GIS can form the basis for developing a catchment-wide understanding of the relative importance …

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Real Time Two Color Variable Resolution Video Moire And Error Map Moire Using A Mach-Zehnder Interferometer, Neville Maycock, August Schutte, Joel H. Blatt Jan 1999

Real Time Two Color Variable Resolution Video Moire And Error Map Moire Using A Mach-Zehnder Interferometer, Neville Maycock, August Schutte, Joel H. Blatt

Aerospace, Physics, and Space Science Faculty Publications

A variable resolution two color video moire system has been built which uses a dual laser illuminated Mach-Zehnder interferometer as the fringe projector. One input of the interferometer is illuminated by a He-Ne laser and the other by an Argon-Ion laser, allowing simultaneous projection of red and green fringes with different spatial frequencies. The dual interferometer outputs are also used, allowing illumination of both the target and reference surfaces. Video cameras view the two surfaces and by mixing the video signals with a chroma-key mix in a video special effects generator, real time moire can be observed. A piezo-electrically driven …

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กิจกรรมสิ่งแวดล้อม Jan 1999

กิจกรรมสิ่งแวดล้อม

Thai Environment

No abstract provided.

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แนวทางการใช้ต้นไม้ในสนามกอล์ฟ เพื่อลดปริมาณการใช้สารเคมี, เจษฎา เต็งรัง Jan 1999

แนวทางการใช้ต้นไม้ในสนามกอล์ฟ เพื่อลดปริมาณการใช้สารเคมี, เจษฎา เต็งรัง

Thai Environment

No abstract provided.

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การจัดการข้อมูลด้านสิ่งแวดล้อมกับสารสนเทศภูมิศาสตร์, ลักษมี เจี้ยวเวชศิลป์ Jan 1999

การจัดการข้อมูลด้านสิ่งแวดล้อมกับสารสนเทศภูมิศาสตร์, ลักษมี เจี้ยวเวชศิลป์

Thai Environment

No abstract provided.

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สัมภษณ์ : ดร. สมพร กมลศิริพิชัยพร ผู้ประสานงานศูนย์ The Greening Of Industry Network-Asia Jan 1999

สัมภษณ์ : ดร. สมพร กมลศิริพิชัยพร ผู้ประสานงานศูนย์ The Greening Of Industry Network-Asia

Thai Environment

No abstract provided.

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ศูนย์ทรัพยากรณ์พลังงาน : แนวคิดในการอนุรักษ์ทรัพยากรธรรมชาติและประหยัดพลังงาน, จันทรา ทองคำเภา Jan 1999

ศูนย์ทรัพยากรณ์พลังงาน : แนวคิดในการอนุรักษ์ทรัพยากรธรรมชาติและประหยัดพลังงาน, จันทรา ทองคำเภา

Thai Environment

No abstract provided.

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International R&D Spillovers: An Application Of Estimation And Inference In Panel Cointegration, Chihwa Kao, Min-Hsien Chiang, Bangtian Chen Jan 1999

International R&D Spillovers: An Application Of Estimation And Inference In Panel Cointegration, Chihwa Kao, Min-Hsien Chiang, Bangtian Chen

Center for Policy Research

In this paper, we apply the asymptotic theory of panel cointegration developed by Kao and Chiang (1997) to Coe and Helpman's (1995) international R&D spillovers regression. The OLS with bias-correction, the fully-modified (FM) and the dynamic OLS (DOLS) estimations produce different predictions about the impact of foreign R&D on total factor productivity (TFP), although all the estimations support the result that domestic R&D is related to TFP.

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On The Estimation Of A Linear Time Trend Regression With A One-Way Error Component Model In The Presence Of Serially Correlated Errors, Chihwa Kao, Jamie Emerson Jan 1999

On The Estimation Of A Linear Time Trend Regression With A One-Way Error Component Model In The Presence Of Serially Correlated Errors, Chihwa Kao, Jamie Emerson

Center for Policy Research

In this paper we study the limiting distributions for ordinary least squares (OLS), fixed effects (FE), first difference (FD), and generalized least squares (GLS) estimators in a linear time trend regression with a one-way error component model in the presence of serially correlated errors. We show that when the error term is I(0), the FE is asymptotically equivalent to the GLS. However, when the error term is I(1) the GLS could be less efficient than the FD or FE estimators, and the FD is the most efficient estimator. However, when the intercept is included in the model and the error …

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Comparison Of Methods For Calculating The Properties Of Intramolecular Hydrogen Bonds. Excited State Proton Transfer, T. Kar, Steve Scheiner, M. Cuma Jan 1999

Comparison Of Methods For Calculating The Properties Of Intramolecular Hydrogen Bonds. Excited State Proton Transfer, T. Kar, Steve Scheiner, M. Cuma

Chemistry and Biochemistry Faculty Publications

A series of molecules related to malonaldehyde, containing an intramolecular H-bond, are used as the testbed for a variety of levels of ab initio calculation. Of particular interest are the excitation energies of the first set of valence excited states, nπ∗ and ππ∗, both singlet and triplet, as well as the energetics of proton transfer in each state. Taking coupled cluster results as a point of reference, configuration interaction-singles–second-order Møller–Plesset (CIS–MP2) excitation energies are too large, as are CIS to a lesser extent, although these approaches successfully reproduce the order of the various states. The …

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Chlorine-Containing Gases In Antarctica, M. A. K. Khalil, R. A. Rasmussen Jan 1999

Chlorine-Containing Gases In Antarctica, M. A. K. Khalil, R. A. Rasmussen

Physics Faculty Publications and Presentations

In recent years, there has been considerable interest in chlorine-containing trace gases in the atmosphere, particularly in Antarctica because of the relationship between chlorofluorocarbons and the antarctic ozone hole. All chlorinecontaining trace gases, whether produced by human activities or by natural processes, have a potential for destroying ozone in the stratosphere. This is a complex environmental problem, but it is clear that manmade chlorine-containing gases are the driving force behind the antarctic ozone hole and, by extension, reductions of stratospheric ozone over other parts of the world [World Meteorological Organization (WMO) 1989, 1991, 1995]. We have taken measurements of the …

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Bridger Formation Sandstones Used As An Indication Of Tectonics In The Green River Basin And Western Wyoming, Lisa S. Novins Jan 1999

Bridger Formation Sandstones Used As An Indication Of Tectonics In The Green River Basin And Western Wyoming, Lisa S. Novins

Honors Papers

Sandstone from the Eocene Bridger Formation of southwestern Wyoming can be used as a tool to constrain the timing and order of controversial tectonic events in the region. The key tectonic element in this region is the Wind River Range. Sandstones in the Bridger were derived from two source areas to the north, one being the basement rocks from the Wind River Range and the other volcanic rocks from the Absaroka Volcanic field (AVF). The abundance of volcanic grains increases upsection in the Bridger indicating that more volcanic material was carried through the Wind River Range. This evidence supports the …

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Olivine Petrofabric Analysis From The Leka Ophiolite Complex, Sarah J. Titus Jan 1999

Olivine Petrofabric Analysis From The Leka Ophiolite Complex, Sarah J. Titus

Honors Papers

Peridotites, gabbros and basaltic volcanic rocks on the island of Leka, Norway in the western Scandinavian Caledonides compose a nearly complete ophiolite sequence. I examined samples from the harzburgite to dunite transition within the ultramafic tectonites of the Leka Ophiolite Complex. This rock sequence probably corresponds to the petrologic Moho, which is the true base of the oceanic crust and lies below the seismic Moho. I used universal stage techniques to determine the crystallographic preferred orientations (CPO) of olivine grains in both dunites from the base of the oceanic crust and residual harzburgites in the uppermost upper mantle. Olivine CPOs …

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A Review Of The Pikes Peak Batholith, Front Range, Central Colorado: A "Type Example" Of A-Type Granitic Magmatism, Diane R. Smith, J. Noblett, R. A. Wobus, D. Unruh, K. R. Chamberlain Jan 1999

A Review Of The Pikes Peak Batholith, Front Range, Central Colorado: A "Type Example" Of A-Type Granitic Magmatism, Diane R. Smith, J. Noblett, R. A. Wobus, D. Unruh, K. R. Chamberlain

Earth and Environmental Geosciences Faculty Research

The N 1.08-Ga Pikes Peak composite batholith of central Colorado is a type example of an Atype granitic system. From the 1970s through the 1990s, details of the field relations, mineralogy, major and trace element compositions, and isotopic geochemistry of Pikes Peak rocks were documented, and they reveal the existence of two chemical groups, a potassic and a sodic series. The potassic series (~64-78 wt % SiO2) includes the Pikes Peak Granite, which is mostly coarse-grained biotite f hornblende syenogranite and minor monzogranite that dominates the batholith. The potassic series also includes fine- to medium-grained biotite granite found …

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On The Exactness Of An S-Shaped Bifurcation Curve, Philip Korman, Yi Li Jan 1999

On The Exactness Of An S-Shaped Bifurcation Curve, Philip Korman, Yi Li

Mathematics and Statistics Faculty Publications

For a class of two-point boundary value problems we prove exactness of an S-shaped bifurcation curve. Our result applies to a problem from combustion theory, which involves nonlinearities like for .

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Changes In Soil Chemistry Beneath Exposed Poultry House Pads And Manure Storage Areas, Stanley L. Chapman, William R. Teague Jan 1999

Changes In Soil Chemistry Beneath Exposed Poultry House Pads And Manure Storage Areas, Stanley L. Chapman, William R. Teague

Journal of the Arkansas Academy of Science

Concerns about nitrates in private drinking water supplies in the older poultry growing areas of Arkansas prompted soil and water testing in the early 1990's. Exposed poultry house pads were recognized as a potential source of nitrates in the groundwater. Soils beneath nine different poultry house pads in five counties were sampled in 10-30 cm increments to bedrock or to a maximum sampling depth of 90 cm. The nine sites had been exposed to natural weathering conditions ranging from never to for more than 20 years. Routine soil tests were conducted by the University of Arkansas Soil Testing Lab at …

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Effects Of Predation On Two Species Of Stream-Dwelling Crayfish (Orconectes Marchandi And Cambarus Hubbsi) In Pool And Riffle Microhabitats, Heidi Dukat, Daniel D. Magoulick Jan 1999

Effects Of Predation On Two Species Of Stream-Dwelling Crayfish (Orconectes Marchandi And Cambarus Hubbsi) In Pool And Riffle Microhabitats, Heidi Dukat, Daniel D. Magoulick

Journal of the Arkansas Academy of Science

Community structure may be governed by many abiotic and biotic factors. Of the biotic factors, predation is often considered to be critical in structuring freshwater stream communities. In the Warm Fork of the Spring River, the crayfish Cambarus hubbsi is found mainly in riffles, whereas the crayfish Orconectes marchandi is found in high numbers in pools. We hypothesized that predation, mainly by fish, is a factor causing this segregation. Higher predation rates for C. hubbsi than 0. marchandi in the pools and higher predation rates for 0. marchandi than C. hubbsi in the riffles were expected. A transplant tethering experiment …

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