Digital Commons Network^™

Search For The Standard Model Higgs Boson At The Lep2 Collider Near √S = 183 Gev, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

During 1997 the ALEPH experiment at LEP gathered 57pb−1 of data at centre-of-mass energies near 183 GeV. These data are used to look for possible signals from the production of the Standard Model Higgs boson in the reaction e+e−→HZ. No evidence of a signal is found in the data; seven events are selected, in agreement with the expectation of 7.2 events from background processes. This observation results in an improved lower limit on the mass of the Higgs boson: mH>87.9GeV/c2 at 95% confidence level.

Determination Of |Vub| From The Measurement Of The Inclusive Charmless Semileptonic Branching Ratio Of B Hadrons, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

From a study of the kinematic properties of the final state produced in the semileptonic decays b→Xℓνℓb→Xℓνℓ, the inclusive charmless semileptonic branching ratio of b hadrons is measured. With a sample of 3.6 million hadronic Z decays recorded between 1992 and 1995 with the ALEPH detector at LEP, the value Br(b→Xuℓνℓ)Br(b→Xuℓνℓ) is determined to be (1.73±0.55stat±0.55syst)×10−3(1.73±0.55stat±0.55syst)×10−3, where XuXu represents any charmless hadronic state and b is a mixture of b hadrons weighted by their production rates. This measurement yields the result|Vub|2=(18.68±5.94stat±5.94syst±1.45HQE)×10−6,|Vub|2=(18.68±5.94stat±5.94syst±1.45HQE)×10−6,where the last error comes from the conversion of the branching ratio to the CKM matrix element squared.

One-Prong Τ Decays With Kaons, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

One-prong ττ decays into final states involving kaons are studied with about 161 000 τ+τ−τ+τ− events collected by the ALEPH detector from 1991 to 1995. Charged kaons are identified by dE/dx measurement, while K0LKL0's are detected through their interaction in calorimeters. Branching ratios are measured for the inclusive mode, B(τ−→K−Xντ)=(1.52±0.04±0.04)%B(τ−→K−Xντ)=(1.52±0.04±0.04)%, where X can be any system of neutral particles, and for the exclusive modesB(τ−→K−ντ)=(6.96±0.25±0.14)×10−3,B(τ−→K−π0ντ)=(4.44±0.26±0.24)×10−3,B(τ−→K−π0π0ντ)=(0.56±0.20±0.15)×10−3,B(τ−→K−π0π0π0ντ)=(0.37±0.21±0.11)×10−3,B(τ−→K−K0ντ)=(1.62±0.21±0.11)×10−3,B(τ−→K−K0π0ντ)=(1.43±0.25±0.15)×10−3,B(τ−→K0¯¯¯¯¯¯¯π−ντ)=(9.28±0.45±0.34)×10−3,B(τ−→K0¯¯¯¯¯¯¯π−π0ντ)=(3.47±0.53±0.37)×10−3,B(τ−→K−ντ)=(6.96±0.25±0.14)×10−3,B(τ−→K−π0ντ)=(4.44±0.26±0.24)×10−3,B(τ−→K−π0π0ντ)=(0.56±0.20±0.15)×10−3,B(τ−→K−π0π0π0ντ)=(0.37±0.21±0.11)×10−3,B(τ−→K−K0ντ)=(1.62±0.21±0.11)×10−3,B(τ−→K−K0π0ντ)=(1.43±0.25±0.15)×10−3,B(τ−→K0¯π−ντ)=(9.28±0.45±0.34)×10−3,B(τ−→K0¯π−π0ντ)=(3.47±0.53±0.37)×10−3,where the first error is statistical and the second is systematical. Upper limits for B(τ−→K0¯¯¯¯¯¯¯π−π0π0ντ)B(τ−→K0¯π−π0π0ντ) and B(τ−→K−K0π0π0ντ)B(τ−→K−K0π0π0ντ) are also obtained. Mass spectra in the final states are investigated in order to study the relevant dynamics.

Search For Bs0 Oscillations Using Inclusive Lepton Events, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

A search for B0sBs0 oscillations is performed using a sample of semileptonic b-hadron decays collected by the ALEPH experiment during 1991–95. Compared to previous inclusive lepton analyses, the proper time resolution and b-flavour mistag rate are significantly improved. Additional sensitivity to B0sBs0 mixing is obtained by identifying subsamples of events having a B0sBs0 purity which is higher than the average for the whole data sample. Unbinned maximum likelihood amplitude fits are performed to derive a lower limit of Δms>9.5ps−1Δms>9.5ps−1 at the 95% confidence limit (95% CL). Combining with the ALEPH D−sDs−-based analyses yields Δms>9.6ps−1Δms>9.6ps−1 at 95% …

Search For Supersymmetry With A Dominant R-Parity Violating Lqd̄ Coupling In E+E- Collisions At Centre-Of-Mass Energies Of 130 Gev To 172 Gev, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

A search for pair-production of supersymmetric particles under the assumption that R-parity is violated via a dominant LQD¯LQD¯ coupling has been performed using the data collected by ALEPH at centre-of-mass energies of 130–172 GeV. The observed candidate events in the data are in agreement with the Standard Model expectation. This result is translated into lower limits on the masses of charginos, neutralinos, sleptons, sneutrinos and squarks. For instance, for m0=500m0=500 GeV/c2/c2 and tanβ=2–√tan⁡β=2 charginos with masses smaller than 81 GeV/c2/c2 and neutralinos with masses smaller than 29 GeV/c2/c2 are excluded at the 95% confidence level for any generation structure of …

Study Of T Decays Involving Kaons, Spectral Functions And Determination Of The Strange Quark Mass, R. Barate, M. Thulasidas

Research Collection School Of Computing and Information Systems

All ALEPH measurements of branching ratios of ττ decays involving kaons are summarized including a combination of results obtained with K0SKS0 and K0LKL0 detection. The decay dynamics are studied, leading to the determination of contributions from vector K∗(892)K∗(892) and K∗(1410)K∗(1410), and axial-vector K1(1270)K1(1270) and K1(1400)K1(1400) resonances. Agreement with isospin symmetry is observed among the different final states. Under the hypothesis of the conserved vector current, the spectral function for the KK¯¯¯¯¯πKK¯π mode is compared with the corresponding cross section for low energy e+e−e+e− annihilation, yielding an axial-vector fraction of (94+6−8)%(94−8+6)% for this mode. The branching ratio for ττ decay into …

Decision Analytic Approach To Severe Head Injury Management., Harmanec D., Tze-Yun Leong, Sundaresh S., Poh K., Yeo T., Ng I., Lew T.

Research Collection School Of Computing and Information Systems

Severe head injury management in the intensive care unit is extremely challenging due to the complex domain, the uncertain intervention efficacies, and the time-critical setting. We adopt a decision analytic approach to automate the management process. We document our experience in building a simplified influence diagram that involves about 3000 numerical parameters. We identify the inherent problems in structuring a model with unclear domain relationships, numerous interacting variables, and real-time multiple inputs. We analyze the effectiveness and limitations of the decision analytic approach and present a set of desiderata for effective knowledge acquisition in this setting. We also propose a …

Ranking Specialized Law Reviews: A Methodological Critique, Gregory S. Crespi

Faculty Journal Articles and Book Chapters

No abstract provided.

The Limits Of Social Choice Theory: A Defense Of The Voting Rights Act, Grant M. Hayden

Faculty Journal Articles and Book Chapters

This Article presents a defense to the challenge that social choice theory presents to voting rights. Arrows theorem, the crown jewel of social choice theory, holds that no voting procedure that meets some minimal conditions of democratic fairness can ensure transitive, meaningful outcomes. The theorem provides a powerful argument against the ability of any court to devise objective vote dilution standards. Because such standards are now a necessary element of claims under section 2 of the Voting Rights Act, Arrows theorem may be viewed as a fundamental threat to the viability of all such claims. The defense of voting rights …

Robust I-Sample Analysis Of Means Type Randomization Tests For Variances, Anthony Joseph Bernard

UNF Graduate Theses and Dissertations

The advent of powerful computers has brought about the randomization technique for testing statistical hypotheses. Randomization tests are based on shuffles or rearrangements of the (combined) sample. Putting each of the I samples "in a bowl" forms the combined sample. Drawing samples "from the bowl" forms a shuffle. Shuffles can be made with or without replacement.

In this thesis, analysis of means type randomization tests will be presented to solve the homogeneity of variance problem. An advantage of these tests is that they allow the user to graphically present the results via a decision chart similar to a Shewhart control …

ข่าวสิ่งแวดล้อม : ตุลาคม-ธันวาคม 2541

Thai Environment

No abstract provided.

การจัดการขยะชุมชนอย่างมีประสิทธิภาพ, สุนีย์ มัลิกะมาลย์

Thai Environment

No abstract provided.

Balancing Interests And Maximizing Rights In Envrionmental Law, Tseming Yang

Faculty Publications

No abstract provided.

What Does Smart Growth Mean For Housing?, Karen A. Danielsen, Robert E. Lang, William Fulton

Public Policy and Leadership Faculty Research

Barely noticed amid the returns from the 1998 midterm elections was a quiet revolution that goes to the heart of how and where Americans live. While most news accounts focused on the high-profile candidate elections, voters across the nation-in Democratic and Republican areas alike-approved more than 160 state and local ballot measures intended to preserve open space and limit urban sprawl.

The coalition forming around the idea of limiting sprawl includes environmentalists, farmers, big-city mayors, and some developers. But perhaps most important, the so-called "smart growth" movement also includes many suburban voters who are fed up with growth. For example, …

Effect Of Asymmetrical Loading And Walking Time On Surface Emg Activity Of The Lumbar Paraspinal Muscles, Michael Aenis, Angela Bueche, Brian Trembly

Masters Theses

BACKGROUND A high incidence of back pain is associated with carrying loads asymmetrically and is believed to be influenced by the amount of weight involved and the distance carried. PURPOSE (1) To study the effects of asymmetrical loading on lumbar paraspinal muscle activity. (2) To document ratings perceived exertion (RPE) for carrying an asymmetrical load. METHODS Electromyography (EMG) readings were obtained at the L2/L3 paraspinal level of 12 males and 12 females. All subjects completed three randomized 9-minute trials consisting of walking on a treadmill while carrying an asymmetrical load of either 0, 10 or 20% of their body weight. …

Predictors Of Successful Completion In A Physical Therapist Assistant Program, Debra S. Howell, Susan M. Stout

Masters Theses

The basis of this research was to investigate the ability of age, gender, ASSET test and science GPA (Human Anatomy & Physiology I and II, Essentials of Pathophysiology, Clinical Kinesiology, Neurological Foundation of Motor Control and Clinical Pathology) to predict the successful completion of a PTA program by a student. In this causal-comparative study (ex post facto), the sample consisted of ninety graduates and five non-graduates from the PTA program at Baker College of Muskegon (1993 -1998).

This study used a logistic regression method to make an attempt to demonstrate that Clinical Kinesiology was significant as a predictor …

H∞ Tracking Control For A Class Of Nonlinear Systems, Joseph A. Ball, Pushkin Kachroo, A. J. Krener

Electrical & Computer Engineering Faculty Research

Develops the theory for tracking control using the nonlinear H∞ control design methodology for a class of nonlinear input affine systems. The authors use a two-step process of first designing the feedforward part of the controller to design for perfect trajectory following and then design the feedback part of the controller using nonlinear H∞ regulator theory. Results for infinite-time and finite-time horizons are presented

Multiple Stochastic Learning Automata For Vehicle Path Control In An Automated Highway System, Cem Unsal, Pushkin Kachroo, John S. Bay

Electrical & Computer Engineering Faculty Research

This paper suggests an intelligent controller for an automated vehicle planning its own trajectory based on sensor and communication data. The intelligent controller is designed using the learning stochastic automata theory. Using the data received from on-board sensors, two automata (one for lateral actions, one for longitudinal actions) can learn the best possible action to avoid collisions. The system has the advantage of being able to work in unmodeled stochastic environments, unlike adaptive control methods or expert systems. Simulations for simultaneous lateral and longitudinal control of a vehicle provide encouraging results

Unlv College Of Education Multicultural & Diversity Newsletter, Steve Mccafferty, John Filler, Nancy P. Gallavan, Le Ann Putney, Nancy Sileo, Kyle Higgins, Porter Troutman, Paul Meacham, Cyndi Giorgis, Aimee Govett, Jean Henry, Bill Pankratius, Susan Rumann, Joyce Nelson-Leaf

College of Education Multicultural & Diversity Newsletter

A newsletter discussing a variety of topics dealing with multicultural topics and diversity in education.

Caribbean: Online Bibliography Environmental History Of Latin America, Darcy C. Del Bosque

Library Faculty Research

This is an annotated bibliography of articles, conference proceedings, reports, and books.

A Survey Of Southern Nevada Employers Regarding The Importance Of Scans Workplace Basic Skills, Greg P Richens

UNLV Retrospective Theses & Dissertations

This study utilized quantitative research methodology and incorporated a descriptive research design that described the perceptions of southern Nevada employers who responded to a survey regarding the importance of the workplace basic skills identified by the Secretary's Commission on Achieving Necessary Skills (SCANS) established by the U.S. Department of Labor. The study sought to determine whether the SCANS skills and competencies were perceived by responding employers as necessary for entry-level employment. Over 75 percent of respondents to the survey essentially considered the SCANS skills and competencies as adequately identifying competencies and skills needed for entry-level employment in their respective business. …

Educator Study Groups: An Exploration Of An Alternative Method Of Preservice Teacher Development, Leah Mary Herner

UNLV Retrospective Theses & Dissertations

This study was conducted to investigate the effect study groups have on preservice teacher education. The participants were enrolled in ESP 444, The Special Education Student in the General Education Classroom. The study took place during a 9-week period; Forty-two students participated in this study. The study involved placing the students randomly into two groups. The lecture group received lectures from graduate students in special education. The study group worked together in groups to research and discuss inclusion of students with disabilities. All students took a knowledge-based pretest and attitude survey prior to beginning the study. All students took a …

Nationally Recognized Superintendents: Perceptions On How They Lead In Relation To The Characteristics Of Effective Schools Research, Warren Paul Mckay

UNLV Retrospective Theses & Dissertations

The purpose of this study was to increase the knowledge about the qualities, attitudes, and behaviors of public school superintendents in relation to the effective schools research. It also sought to further investigate the relationship between the role of the superintendent and the creation of effective schools and effective school districts. Finally, this research described how a recognized population of public school superintendents perceived themselves to incorporate effective school methods in their leadership strategies. This ultimately provided the opportunity to validate the findings of the effective schools research through the investigation of the superintendents office; This study employed what Creswell …

The Art Of Truth: The Architecture Of 19th -Century American Allegory, Gary Brian Bennett

UNLV Retrospective Theses & Dissertations

The current study, in its broadest scope, explores the nature of literary art primarily as a moral experience. Specifically, it addresses ironic allegory---a genre of fiction born during the American Renaissance of the mid-nineteenth century. As an amalgam of two other oblique genres, Gothic fiction and Puritan allegory, ironic allegory was originally the product of Nathaniel Hawthorne's moral imagination and tragic sensibility; consequently, its primary themes are the properties of time, the problems of tragedy, the process of transformation, and the preeminence of truth. Focusing exclusively on the architectural metaphors in Cooper's Templeton trilogy, Hawthorne's The House of the Seven …

Finite Elements With H -Adaptation For Momentum, Heat And Mass Transport With Application To Environmental Flow, David Bradley Carrington

UNLV Retrospective Theses & Dissertations

Self-adaptive algorithms for 2 and 3-dimensional unstructured finite element grids are recent to the solution of partial differential equations, particularly those equations describing environmental transport. An h-adaptive grid embedding method is developed to solve the incompressible Navier-Stokes equations for fluid flow and scalar transport. An application to atmospheric mass transport is presented; This h-adaptive algorithm, in combination with the finite element method, has been designed to solve 2 and 3-dimensional problems on Pentium PC's, including problems involving complex geometry on high end PC's, workstations and mainframes. The Galerkin finite element solver is a 2 point Gauss-Legendre integration scheme which employs …

Think Different: A Comparison Of The Critical Thinking Abilities Of Education Majors, Shelly Weeks Channel

UNLV Retrospective Theses & Dissertations

In an increasingly complex society, the need for people to exercise critical thinking effectively is clearly evident. The institution of education recognizes that its responsibility to teach students to think critically is vital in order for them to negotiate decisions humanely and intelligently in an ever-changing world; Hundreds of reports from various committees and researchers along with such insidious incidents as the rise in murderous assaults on children inside school buildings, such as the massacre in Littleton, Colorado, attest to the fact that schools fail to teach students to evaluate social life critically. While educators advocate critical thinking, teacher education …

The Effects Of Computerized Instruction In Intermediate Algebra, Cynthia Lynn Glickman

UNLV Retrospective Theses & Dissertations

This study was designed to measure the effects of a reform oriented computer assisted instructional environment R-CAI on community college students' procedural skill acquisition and conceptual understanDing Also examined were the effects of a computerized instructional environment on students' attitudes toward mathematics; The R-CAI involved the use of Prentice Hall's Interactive Mathematics with lessons created to provide opportunities for students to learn within "real world" contexts. Using these activities, students collected information, analyzed data and applied mathematical concepts; After controlling for initial differences, it was concluded that students taught by the R-CAI environment significantly outperformed students taught by the Traditional …

Dimension Reduction Of Image And Audio Space, Blaine Lee Hagstrom

UNLV Retrospective Theses & Dissertations

The reduction of data necessary for storage or transmission is a desirable goal in the digital video and audio domain. Compression schemes strive to reduce the amount of storage space or bandwidth necessary to keep or move the data. Data reduction can be accomplished so that visually or audibly unnecessary data is removed or recoded thus aiding the compression phase of the data processing. The characterization and identification of data that can be successfully removed or reduced is the purpose of this work. New philosophy, theory and methods for data processing are presented towards the goal of data reduction. The …

An Evaluation Of Unsaturated Flow Models In An Arid Climate, Jason Michael Dixon

UNLV Retrospective Theses & Dissertations

The objective of this study was to evaluate the effectiveness of two unsaturated flow models in and regions. The area selected for the study was the Area 5 Radioactive Waste Management Site (RWMS) at the Nevada Test Site in Nye County, Nevada. The two models selected for this evaluation were HYDRUS-1D [Simunek et al., 1998] and the SHAW model [Flerchinger and Saxton, 1989]. Approximately 5 years of soil-water and atmospheric data collected from an instrumented weighing lysimeter site near the RWMS were used for building the models with actual initial and boundary conditions representative of the site. Physical processes affecting …

Non-Intrusive Assessment Of Radionuclides In Enclosed Pipes And Vessels, Traci Renee Glew

UNLV Retrospective Theses & Dissertations

The assessment and cleanup of various nuclear sites throughout the country has become an increasingly important issue. Methods for assessment of radioactive material within pipe and duct systems at these sites must be cost effective, efficient, and safe. Several tests were conducted at the University of Nevada, Las Vegas, using both steel and aluminum pipes with a Cesium 137 source placed inside. A Geiger-Muller pancake detector was used to measure gamma rays from several angular positions and at various axial distances along the outside of the pipe. A plot of the data showed excellent results despite the low efficiency of …