Digital Commons Network^™

Central Pseudorapidity Gaps In Events With A Leading Antiproton At The Fermilab Tevatron P̅P Collider, Darin Acosta, Kenneth A. Bloom, Collider Detector At Fermilab Collaboration

Kenneth Bloom Publications

We report a measurement of the fraction of events with a large pseudorapidity gap Δη within the pseudorapidity region available to the proton dissociation products X in p̅+p→p̅+X. For a final state p̅of fractional momentum loss ξ_p̅ and 4-momentum transfer squared t^p̅ within 0.06<ξ_p̅t^p̅|2 at √s=1800 [630] GeV, the fraction of events with Δη>3 is found to be 0.246±0.001 (stat)±0.042 (syst) [0.184±0.001 (stat)±0.043 (syst)]. Our results are compared with gap fractions measured in minimum bias p̅p collisions and with theoretical expectations.

So(2,1) Conformal Anomaly: Beyond Contact Interactions, Horacio E. Camblong

Physics and Astronomy

The existence of anomalous symmetry-breaking solutions of the SO(2,1) commutator algebra is explicitly extended beyond the case of scale-invariant contact interactions. In particular, the failure of the conservation laws of the dilation and special conformal charges is displayed for the two-dimensional inverse square potential. As a consequence, this anomaly appears to be a generic feature of conformal quantum mechanics and not merely an artifact of contact interactions. Moreover, a renormalization procedure traces the emergence of this conformal anomaly to the ultraviolet sector of the theory, within which lies the apparent singularity.

Teaching Mathematics In Seven Countries : Results From The Timss 1999 Video Study., James Hiebert, Ronald Gallimore, Helen Garnier, Karen Bogard Givvin, Hilary Hollingsworth, Jennifer Jacobs, Angel Miu-Ying Chui, Diana Wearne, Margaret Smith, Nicole Kersting, Alfred Manaster, Ellen Tseng, Wallace Etterbeek, Carl Manaster, Patrick Gonzales, James Stigler

TIMSS 1999

The Third International Mathematics and Science Study (TIMSS) 1999 Video Study sampled eighth grade mathematics lessons in seven countries including Australia. As well as describing teaching in these countries the study aimed to : develop objective, observational measures of classroom instruction to serve as appropriate quantitative indicators of teaching practices in each country; compare teaching practices among countries and identify similar or different lesson features across countries; describe patterns of teaching within each country; and develop methods for communicating the results of the study, through written reports and video cases, for both research and professional development purposes. The results in …

Hands-On Manipulative Use In Science Instruction, Bianca Lee Domenico

Theses and Dissertations

This study tested the use of physical manipulatives during science instruction – in conjunction with the traditional, textbook-oriented approach – and determines whether manipulatives create more significant learning experiences than text generates alone. The subject sample consisted of 20 third-grade students from a suburban New Jersey elementary school classroom. All subjects functioned at least on a third-grade level in all subjects with the exception of three students, who participated in the Talented and Gifted Program. Subjects from the experimental group and the control group completed a science content pretest of thirteen open-ended cognition questions. Both groups completed assigned activities, and …

Experimental And Calculated Stark Widths Within The Kr I Spectrum, Vladimir Milosavljevic, Stevan Djenize, Milan S. Dimitrijevic

Articles

On the basis of the precisely recorded 20 neutral krypton (Kr I) line shapes (in the 5s−5p and 5s−6p transitions), we have obtained the basic plasma parameters, i.e., electron temperature (T) and electron density (N) using our line deconvolution procedure in a plasma created in a linear, low-pressure, pulsed arc discharge operated in krypton. The mentioned plasma parameters have also been measured using independent experimental diagnostics techniques. Agreement has been found among the two sets of the obtained parameters. This recommends our deconvolution procedure for plasma diagnostical purposes, especially in astrophysics where direct measurements of the …

The Effect Of Student Journals On Achievement In And Attitudes Toward Science, Holly Cowell

Theses and Dissertations

The purpose of this action research project was to determine if: (a) writing in student journals affected the grades of my students, and (b) if student attitudes were affected by writing in journals and receiving teacher feedback. The research was conducted during the third semester at Triton Regional High School with a total of 49 tenth-grade students enrolled in two Laboratory Biology classes. Students in one class wrote in journals about teacher-posed topics for five minutes on average of once per week. The topics were written to encourage personalization of learning and further interaction with science. An attitude survey was …

Faculty And Staff Join Inventing Flight's Small Army Of Volunteers, Help Region Put Its Best Foot Forward During Three-Week Celebration

News Releases

News release announces that volunteers from all walks of the University of Dayton campus say they're devoting time and energy to the Inventing Flight celebration because they want to be a part of history and "help the region put its best foot forward."

Advice For The Secretary Of Agriculture About Management Of The Giant Sequoia National Monument, J. N. Clarke, D. M. Graber, K. M. Nissen, D. D. Piirto, N. L. Stephenson, D. R. Tormey, P. E. Waggoner

Natural Resources Management and Environmental Sciences

Landscapes held in public trust are difficult to manage; a living National Monument subject to increased public use presents additional challenges. These landscapes are subject to regional and global effects outside the manager's control, such as global climate change and air pollution. They are also subject to innumerable local variables, most of whose effects are difficult to predict. The giant sequoia groves and their surrounding ecosystem are fiercely loved by many; although the goals may be broadly similar, the objectives and policies of these giant sequoia lovers are often sharply at odds.

Honoring The Tradition: The Centennial Celebration

Cal Poly Magazine

No abstract provided.

Advancing The Mission: Year In Review

Cal Poly Magazine

No abstract provided.

Technical Efficiency In Public And Private Sectors In India: Evidence From The Post-Reform Years, T. T. Ram Mohan, Subhash C. Ray

Economics Working Papers

While India's state-owned enterprises are widely believed to be inefficient, there is a dearth of studies that document such inefficiency on any rigorous basis. Yet, since improvement in firm efficiency is one of the basic objectives of privatization, it is important to assess whether efficiency is indeed lower in the public sector than in the private sector. This paper compares the performance of state-owned enterprises with those of private sector firms in respect of technical efficiency. The comparison is made in eight different sectors over the period 1991-92 to 1998-99. We measure technical efficiency using the method of Data Envelopment …

Design Of A Louisiana Interstate System, Joseph Cains Iii

Electronic Dissertations and Theses

The need for a transportation system in the United States, as well as the entire world, has long been a key factor for the high-level, fast paced society we know today. The desire to explore and expand territory and influence spawning from curiosity and instinctive nature of man has played a large role in the many eras of invention and progress, bringing a once primitive existence to the significantly advanced modern life in which we live. From the stone wheel to the metal wings of a plane, our intellectual advancement has progressed significantly, and over the years the demand for …

Young Conservationists And The Future Of Protected Areas Worldwide, Lisbet Kugler

Yale School of the Environment Publications Series

A Call to Discussion at the Fifth World Parks Congress,Durban, South Africa, September 2003

A Note On The Equilibrium Properties Of Locational Sorting Models, Patrick Bayer, Christopher Timmins

Discussion Papers

No abstract provided.

What Drives Racibring Some Thing Simple Then You Will Eaal Segregation? New Evidence Using Census Microdata, Patrick Bayer, Robert Mcmillan, Kim Rueben

Discussion Papers

No abstract provided.

Problem-Based Learning In A Fourth Grade Gifted And Honors Mathematics Class, Barbara J. Barr

All Graduate Projects

Problem-based learning was used to deliver math instruction on three different occasions. Thirty-two fourth-grade students were involved in the project. The purpose was to investigate students' attitudes towards word problems and the development of their confidence with problem-solving skills by providing differentiation through Problem-based learning. The results showed that the majority of the students perceived themselves as good problem solvers and that math in school was related to real life.

Taylor: A Magazine For Taylor University Alumni And Friends (Summer 2003), Taylor University

The Taylor Magazine (1963-Present)

The Summer 2003 edition of Taylor Magazine, published by Taylor University in Upland, Indiana.

Classwide Peer Tutoring With Or Without Competitive Reinforcement: Impact On Academic Growth And Intrinsic Interest, Dale R. De Weerd

Master of Education Program Theses

This study examined the effects of Classwide Peer Tutoring on students' academic gains and intrinsic interest in two fourth-grade math classes under two conditions-c-with competitive reinforcement (CWPT + CR) and without competitive reinforcement (CWPT - CR). Extending spelling CWPT research of C. C. Cheung and S. Winter (1999), this study utilized an adapted multiplication pretest and posttest and the Attitude Toward Mathematics Scale, developed by Peterson (1978). Study results showed a lack of statistical significance regarding group differences at posttest. However, due to traditional CWPT's impact on classroom atmosphere, peer perception, and learning focus, the investigator recommends eliminating competitive reinforcement …

Rotational Velocities Of B, A, And Early‐F Narrow‐Lined Stars, Francis C. Fekel

Information Systems and Engineering Management Research Publications

Projected rotational velocities for 58 B, A, and early‐F stars have been determined from high‐resolution spectroscopic observations made at Kitt Peak National Observatory with the coudé feed telescope. All the stars are slowly rotating with vsin i<60 km s−1. Because of their low rotational velocities, 15 of the stars have been observed as prospective, early‐type, radial velocity standards.

Institute Of Archaeology & Horn Archaeological Museum Newsletter Volume 24.3, David Merling, Robert D. Bates, Paul J. Ray Jr.

Institute of Archaeology & the Horn Archaeological Museum Newsletter

Institute/Museum to Relocate, David Merling

Klingbeil on Surveys, Robert D. Bates

Ortiz on David, Paul J. Ray, Jr.

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Pride, July 2003, Lindenwood University

Pride

Pride was a news magazine for Lindenwood University.

The Learning Marketspace, July 2003, Bob Heterick, Carol Twigg

The Learning MarketSpace (4/03 - 4/14)

No abstract provided.

Untangling The Web: The National Digital Libraries Initiative, Dean Johnston

Chemistry Faculty Scholarship

A report on the National Digital Libraries Initiative is presented. To facilitate access to the vast resources of the Internet, the National Science Foundation has created the Digital Libraries Initiative. Several sites have come online recently that index and catalog materials in a way similar to a library, providing additional information about each site. The official National Science Digital Library Web site has the potential to become a one-stop site for a wide range of educational science material.

Toward A Comprehensive Supplement For Language Courses, Krishnaprasad Thirunarayan, Stephen P. Carl

Kno.e.sis Publications

No abstract provided.

Active Citizenship And The Secondary School Experience : Community Participation Rates Of Australian Youth, Kevin Brown, Carla Lipsig-Mumme, Grazyna Zajdow

LSAY Research Reports

This project explores the relationship between volunteering, active citizenship and community participation for young Australians.

Patterns Of Participation In Year 12, Sue Fullarton, Maurice Walker, John Ainley, Kylie Hillman

LSAY Research Reports

The focus of this report is on participation in the final year of school. At present a little less than three-quarters of young Australians remain at school to Year 12. This report documents the differences in Year 12 participation rates between males and females, socioeconomic background, cultural background, and earlier school achievement. There are also differences associated with school sector and location. [Executive summary, ed]

Acer Enews 07 July 2003, Acer

ACER eNews Archive 2001-2013

No abstract provided.

Infrared Spectroscopic Ellipsometry Study Of Vinylidene Fluoride (70%)-Trifluoroethylene (30%) Copolymer Langmuir-Blodgett Films, Mengjun Bai, Matt Poulsen, A.V. Sorokin, Stephen Ducharme, C.M. Herzinger, V.M. Fridkin

Stephen Ducharme Publications

We report the studies of the molecular conformation and chain orientations through characterization of the vibrational modes in crystalline Langmuir–Blodgett films of the polyvinylidene fluoride/trifluoroethylene copolymer. The infrared spectra obtained by polarized reflectometry and ellipsometry showed that the ferroelectric phase has predominantly all-trans conformation and the paraelectric phase has predominantly alternating trans-gauche conformation, as in solvent-formed films of the same copolymer. The results showed that the polymer chains are predominantly parallel to the film plane with a random in-plane orientation and most of the ferroelectric phase vibrational mode behaviors are consistent with the published mode assignments. The ferroelectric phase optical …

Information Outlook, July 2003, Special Libraries Association

Information Outlook, 2003

Volume 7, Issue 7

Nonautonomous Difference Equations: Open Problems And Conjectures, Saber Elaydi

Mathematics Faculty Research

Autonomous difference equations of the form x_n+1 = ƒ (x_n) may model populations of species with nonoverlaping generations such as fish, orchard pests, etc. The drawback of such models is that they do not account for environmental fluctuations or seasonal changes. Hence we are led to nonautonomous difference equations of the form x_n+1 = ƒ (x_n), n ∈ Ζ⁺. Our main focus in this note will be on periodic difference equations in which the sequence ƒ_n is periodic. Most of the open problems and conjectures in this …