Digital Commons Network^™

Measurement Of The Diffractive Cross Section In Deep Inelastic Scattering Using Zeus 1994 Data, J. Breitweg, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, R. Yoshida, H. Zhang, Margarita C. K. Mattingly, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Laurenti

Faculty Publications

The DIS diffractive cross section, dσdiffγ*p→XN/dMx, has been measured in the mass range Mx < 15 GeV for γ*p c.m. energies 60 < W < 200 GeV and photon virtualities Q2 = 7 to 140 GeV2. For fixed Q2 and Mx, the diffractive cross section rises rapidly with W, dσdiffγ*p→X N (Mx, W, Q2)/dMx ∝ Wadiff with adiff = 0.507 ± 0.034 (stat) +0.155-0.046 (syst) corresponding to a t-averaged pomeron trajectory of ̄αℙ = 1.127 ± 0.009 (stat) +0.039-0.012 (syst) which is larger than ̄αℙ observed in hadron-hadron scattering. The W dependence of the diffractive cross section is found to be the same as that of the total cross section for scattering of virtual photons on protons. The data are consistent with the assumption that the diffractive structure function FD(3)2 factorizes according to cursive greek chiℙFD(3)2(cursive greek chiℙ, β, Q2) = (cursive greek chi0//cursive greek chiℙ)nFD(2)2(β, Q2). They are also consistent with QCD based models which incorporate factorization breaking. The rise of cursive greek chiℙFD(3)2 with decreasing cursive greek chiℙ and the weak dependence of FD(2)2 on Q2 suggest a substantial contribution from partonic interactions.

Exclusive Electroproduction Of Ρ0 And J/Ψ Mesons At Hera, J. Breitweg, S. Chekanov, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, R. Yoshida, H. Zhang, Margarita C. K. Mattingly, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci

Faculty Publications

Exclusive production of ρ0 and J/ψ mesons in e+p collisions has been studied with the ZEUS detector in the kinematic range 0.25 < Q2 < 50 GeV2, 20 < W < 167 GeV for the ρ0 data and 2 < Q2 < 40 GeV2, 50 < W < 150 GeV for the J/ψ data. Cross sections for exclusive ρ0 and J/ψ production have been measured as a function of Q2, W and t. The spin-density matrix elements r0400, r11-1i and Re r510 have been determined for exclusive ρ0 production as well as r0400 and r041-1 for exclusive J/ψ production. The results are discussed in the context of theoretical models invoking soft and hard phenomena.

Measurement Of Dijet Photoproduction At High Transverse Energies At Hera, J. Breitweg, S. Chekanov, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, A. Pellegrino, J. Repond, R. Stanek, R. Yoshida, Margarita C. K. Mattingly, G. Abbiendi, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Laurenti

Faculty Publications

The cross section for dijet photoproduction at high transverse energies is presented as a function of the transverse energies and the pseudorapidities of the jets. The measurement is performed using a sample of ep-interactions corresponding to an integrated luminosity of 6.3 pb-1, recorded by the ZEUS detector. Jets are defined by applying a kT-clustering algorithm to the hadrons observed in the final state. The measured cross sections are compared to next-to-leading order QCD calculations. In a kinematic regime where theoretical uncertainties are expected to be small, the measured cross sections are higher than these calculations.

Measurement Of High-Q2 Neutral-Current E+P Deep Inelastic Scattering Cross-Sections At Hera, J. Breitweg, S. Chekanov, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, A. Pellegrino, J. Repond, R. Stanek, R. Yoshida, Margarita C. K. Mattingly, G. Abbiendi, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Laurenti

Faculty Publications

The e+p neutral-current deep inelastic scattering differential cross-sections dσ/dQ2, for Q2 > 400 GeV2, dσ/dx and dσ/dy, for Q2 > 400, 2500 and 10000 GeV2, have been measured with the ZEUS detector at HERA. The data sample of 47.7 pb-1 was collected at a center-of-mass energy of 300 GeV. The cross-section, dσ/dQ2, falls by six orders of magnitude between Q2 = 400 and 40000 GeV2. The predictions of the Standard Model are in very good agreement with the data. Complementing the observations of time-like Z° contributions to fermion-antifermion annihilation, the data provide direct evidence for the presence of Z° exchange in the …

Measurement Of Multiplicity And Momentum Spectra In The Current And Target Regions Of The Breit Frame In Deep Inelastic Scattering At Hera, J. Breitweg, S. Chekanov, M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, R. Stanek, R. Yoshida, Margarita C. K. Mattingly, G. Abbiendi, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, G. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, N. Coppola, M. Corradi, S. De Pasquale, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi

Faculty Publications

Charged particle production in neutral current deep inelastic scattering (DIS) has been studied using the ZEUS detector. The evolution of the mean multiplicities, scaled momenta and transverse momenta in Q2 and cursive Greek chi for 10 < Q2 < 5120 GeV2 and cursive Greek chi > 6 × 10-4 has been investigated in the current and target fragmentation regions of the Breit frame. Distributions in the target region, using HERA data for the first time, are compared to distributions in the current region. Predictions based on MLLA and LPHD are inconsistent with the data.

Husserl, Horaz Und Die “Heilsmächte Der Phänomenologie”, Sebastian Luft, Markus Asper

Philosophy Faculty Research and Publications

No abstract provided.

Development And Evaluation Of A Scaffolding Guide To Help Lower Secondary Science Students Use The Internet To Search For, Select And Organise Information For The Construction Of Personal Text, Andrea Tunks

Theses: Doctorates and Masters

The purpose of this study was to develop and evaluate a scaffolding guide to help lower secondary students use the internet to search for and organise information for the construction of personal text. An intact Year 10 science class participated in the study. Data were collected using the scaffolding guide completed by students, work samples, a questionnaire designed to elicit from students their perceptions about the research guide, observational notes made by the researcher and debriefing interviews conducted with the teacher and with a group of students. The study identified the skills needed by students to search for and select …

Secondary Students' Skills Of Measuring Liquid Volume And Understanding Of Uncertainty Of Data, Wayne M. Keady

Theses: Doctorates and Masters

This research is a detailed study of students' skills of measuring liquid volume, the decisions they make when planning to collect data and whilst collecting data, and the extent to which they understand the uncertainty associated with the data they collected. These skills and understandings are at the heart of scientific literacy (Duggan & Gall, 1996a). The introduction of the Working Scientifically strand in the Australian national curriculum framework and profile of learning outcome statements for science (Australian Education Council, 1994) illustrates the increased emphasis placed in curriculum documents on investigation skills and scientific literacy. The profile of outcome statements …

A Critical Analysis Of Devolution And The Corporate Reform Of Teachers' Work, Patrick O'Brien

Theses: Doctorates and Masters

The corporate transformation of bureaucratic public education in Western Australia commenced in the late 1980s. The reforms announced in the Better Schools Report (1987) aimed to devolve responsibility to schools for the purpose of improving the efficiency and effectiveness of public education. Designed to be responsive, adaptable, flexible and accountable, the administrative style accompanying the reforms is described as corporate managerialism. Devolution has impacted heavily on schools and teachers' work. Evidence presented in this thesis suggests that the corporate values and practices that dominate the organisation and management of schools create personal and professional conflict for many classroom teachers. Devolution …

Analysis Of Increases In Fishing Power In The Western Rock Lobster (Panulirus Cygnus) Fishery, John Fernandez

Theses: Doctorates and Masters

The western rock lobster, Panulirus cygnus, fishery represents a significant commercial asset to Western Australia, and it is therefore important that appropriate strategies are developed to effectively manage it. Because the fishery has a very high level of exploitation, researchers and managers rely significantly on annual stock assessments which are based on catch and effort data. This study will identify and assess the effects that changes in fishing power factors (e.g. advances in fish-finding technology) have had on estimates of catch and effort. The fishing power increases can be used to adjust nominal fishing effort to produce a time series …

The Response Of Secondary Students From Non-English Speaking Backgrounds To A Visual Arts Course, Jean O. Aitken

Theses: Doctorates and Masters

Interest in multiculturalism has been expressed by educators for a number of years. Much of the literature concerning multiculturalism in visual arts education calls for the adoption of a culturally inclusive curricula in order to meet the needs of all students. In his consideration of conceptions of curriculum, Eisner (1988) made reference to a preferred body of knowledge which often excludes students from minority groups within society. Many Australian schools are experiencing increases in enrolments of students from non-English speaking backgrounds (NESB). These students may themselves be immigrants or the children of one or both parents born in another country. …

Reading Dorothy Hewett As Boundary Writer, Carmel M. Grahame

Theses: Doctorates and Masters

This thesis locates the writings of Dorothy Hewett in a firm relationship with postmodern thought. The argument focuses on evidence that the dominant aesthetic of Hewett's writing is the feminine sublime which comprises a commitment to uncertainty. In this modality, reason does not foreclose on the action of the imagination in the sublime moment. The revised dynamic is explored with an emphasis on the radical nature of the doubt in question. It reflects a deliberate resistance to certainty, and fol1ows from Hewett's early experience with communism. At a formal level, in Hewett's texts, the commitment to uncertainty is not least …

A Windows Program For Airfoil Design Using B-Splines, Matthew Maclean

Theses

The objective of this thesis has been threefold. First, the formulation of splines has been studied and their development into a computer algorithm has been implemented. Splines represent a powerful concept in computer modeling and geometric representation, for, as parametric curves, they provide a compact way to store the information defining a curve or surface. B-splines have been exclusively used in this thesis, although other types of splines exist. The second goal of this thesis was to learn and utilize C++ as a programming tool in the demonstration of B-spline techniques. C++ was chosen because it is object-oriented, and because …

Chief Justice Holmes On The Science And Art (And Politics) Of Judging, David J. Seipp

Faculty Scholarship

Oliver Wendell Holmes, Jr. (1841-1935), twenty-fifth Chief Justice of Massachusetts, needs no introduction to the readers of this journal. Son and namesake of one of America's most popular writers, he was at twenty-four a Civil War hero wounded three times in battle, and at forty a lawyer-scholar whose book of lectures The Common Law would win him international renown. At sixtyone he began three decades as the Great Dissenter on the U.S. Supreme Court, where he exposed the economic theory underpinning the dominant freedom-of-contract ideology. Between 1882 and 1902-between early promise and later fame-he served on the Supreme Judicial Court …

Embeddability Of Pseudoline Arrangements And Point Configurations To Eucliean Plane, Javid Huseynov

Theses

The present thesis explores embeddability (realizability) properties of pseudoline arrangements, perhaps, the most important mathematical structures in computational geometry. The underlying theme is the use of combinatorial representation of arrangements vs. usual geometric representation to approach the embeddability problem. The combinatorial representation chosen is that of counterclockwise systems (CCsystems) introduced by D.E. Knuth in 1992. CC systems were defined as sets of ordered triples of points that incorporate and obey counterclockwise relations on points in the plane. If a CC system can arise from actual points in the plane, it is called realizable. Not all CC-systems are realizable in plane, …

Combinatorial Computing Approach To Selected Extremal Problems In Geometry, Alina Beygelzimer

Theses

Not provided.

Team Learning In A Undergraduate Setting In Croatia, Marvin Deitz

Theses

This study focused on team learning at an undergraduate school environment. The researcher focused on a city in Croatia called Dubrovnik. The school is American College and consists of English speaking students that are composed of mostly Croatian descent. These students are Hospitality and Tourism majors and are eventually going to help the tourism economy after they graduate. This research contrasted student's performance in one individual lesson plan in two different classes. One class is presented the material through the traditional lecture and the other class is presented the material through teams and collaborative learning. The two classes were given …

Properties Of An Aluminum Based Multilayered Material Versus Package And Processing Performance, Eoin De Roiste

Theses

Due to a manufacturing issue within the company the lack of knowledge of a key material is highlighted. Research into the material is conducted under seal testing and mechanical properties. The material is multilayered, with aluminium foil as its core plus is top coated and has a sealant layer as its bottom coating. Background literary review commences with a chronological assessment of packaging down through the ages and culminates with details on multilayered materials, concentrating on the type of material being researched. A test plan details the research requirements. Seal testing consists of burst and peel testing of the material …

Genetic Algorithm And Tabu Search Approaches To Quantization For Dct-Based Image Compression, Michael Champion

Theses

Today there are several formal and experimental methods for image compression, some of which have grown to be incorporated into the Joint Photographers Experts Group (JPEG) standard. Of course, many compression algorithms are still used only for experimentation mainly due to various performance issues. Lack of speed while compressing or expanding an image, poor compression rate, and poor image quality after expansion are a few of the most popular reasons for skepticism about a particular compression algorithm. This paper discusses current methods used for image compression. It also gives a detailed explanation of the discrete cosine transform (DCT), used by …

Investigation Of On-Demand Digital Printing For The Needs Of Mine Safety Appliances Co., Cathy Mcdonald

Theses

The printing needs of Mine Safety Appliances Co. (MSA) along with the definition and functions of ondemand digital printing seemed to be complimentary. Not only can digital presses improve turn around times, but they are also said to be economical for short print runs. Therefore, the focus of this study was to evaluate several on-demand digital printers and determine which press was most appropriate for MSA. After investigation, it was determined while no one press satisfied all of the areas, the Indigo Omnius met the most needs. The Omnius could save time and money printing bags, labels, and a variety …

Guide For Developing Integrated Aquatic Vegetation Management Plans In Oregon, Maribeth Gibbons, Mark Rosenkranz, Harry L. Gibbons, Mark Sytsma

Center for Lakes and Reservoirs Publications and Presentations

This manual focuses on controlling nuisance aquatic plants, occurring in Oregon lakes. To use this manual, it is necessary to distinguish between an aquatic plant problem, and a water quality enrichment problem that typically results in excessive algae production (See Box this page). The most serious type of aquatic plant problem is caused by invasion of a waterbody by a non-native species. Non-native weed invaders may flourish in suitable conditions and degrade habitat and other beneficial uses. The biology and ecology of weeds allows them to fluorish under a wide range of conditions. Nutrient enrichment is not a prerequisite for …

Contract Construction And Interpretation: From The “Four Corners” To Parol Evidence (And Everything In Between), Keith A. Rowley

Scholarly Works

The pervasive use of computers has revolutionized both the practice of law and the conduct of business. Agreements once performed on the basis of an oral promise or a hand shake, at one end of the spectrum, or only following lengthy negotiations and exchanges of drafts of documents which had to be recreated from scratch at each stage, at the other, often are now governed by writings prepared with minimal effort, based on a computerized form used by a party to the contract, or its attorneys, in some prior deal. The ease of “block and copy” drafting of contracts and …

Glacial Deposits, Vol. 27, 1998-1999, Department Of Geography-Geology

Glacial Deposits

Newsletter of the Department of Geography-Geology

Analytical Modeling Of Cake Filtration, Scott A. Wells

Civil and Environmental Engineering Faculty Publications and Presentations

The specific resistance model of cake filtration is based on the assumption that the average cake resistance is constant over time. This implies also that the spatially average values of porosity and pressure differential are also constant over time since specific resistance is a function of both parameters.

An analytical cake filtration model based on Tiller (1975) was derived using constitutive properties of kaolin suspensions in distilled water. Constitutive properties were determined by experiments performed using high-energy X-rays and porewater pressure probes to determine the spatial and temporal distributions of porosity and porewater pressure. Using these constitutive properties, predictions were …

Improvements In Modeling Dissolved Oxygen In Activated Sludge Systems, Jacek Makinia, Scott A. Wells

Civil and Environmental Engineering Faculty Publications and Presentations

The aim of this research was to show the impact of the flow conditions and variations in the aeration intensity on changes in the predicted dissolved oxygen (DO) concentrations in a full-scale activated sludge reactor. The Activated Sludge Model No. 1 was used to describe the biochemical processes. The studies were performed at the Rock Creek wastewater treatment plant in Hillsboro, OR (USA). The simulation results were compared with data originating from two 24-hour experiments. The model that best reflected the spatial and diurnal distributions of the DO concentrations was the one-dimensional advection-dispersion equation with a variable overall oxygen mass …

Punitive Damages: On The Path To A Principled Approach, Jane Mallor, Barry S. Roberts

UC Law Journal

No abstract provided.

Unnatural Competition?: Applying The New Antitrust Learning To Foster Competition In The Local Exchange, Ashutosh Bhagwat

UC Law Journal

No abstract provided.

A General Framework For Competitive Analysis In Wireless Telecommunications, J. Gregory Sidak, Hal J. Singer, David J. Teece

UC Law Journal

No abstract provided.

The Steep Spectrum Quasar Pg1404+ 226 With Asca, Hst And Rosat, Marie-Helene Ulrich, Andrea Comastri, Stefanie Komossa, Phil Crane

Dartmouth Scholarship

We present and discuss our observations of the Narrow Line quasar PG1404+226 (zem = 0.098) with ASCA and HST, and a re-analysis of our earlier observa- tions with ROSAT. The soft X-ray spectrum is very steep and displays an absorption feature (edge or line at ∼ 1.1 keV). We have applied a variety of models to the ASCA and ROSAT spectra without finding a completely satis- factory fit, and the identification of the edge remains un- certain. A satisfactory fit of the ASCA spectrum assuming that the edge is produced by highly ionized iron (using the code absori in XSPEC) …

Unnatural Competition? Applying The New Antitrust Learning To Foster Competition In The Local Exchange, Ashutosh Bhagwat

Faculty Scholarship

No abstract provided.