Digital Commons Network^™

Is It Always Dark In Caves?, Giovanni Badino

International Journal of Speleology

Underground natural sources of visible light are considered. The main light producer is Cerenkov radiation emitted in air, water and rock by cosmic ray muons, that depends, in a complex way, on shape of mountain and of caves. In general the illumination increases linearly with the cavity dimensions. Other light sources are from secondary processes generated by radioactive decays in rock from minerals luminescence. The natural light fluxes in caves are in general easy to detect but are not used from underground life.

Improving The Accuracy Of Predicting Effectiveness Factors For Mth Order And Langmuir Rate Equations In Spherical Coordinates, Jianhui Hong, William C. Hecker, Thomas H. Fletcher

Faculty Publications

Char oxidation is often modeled using an mth order intrinsic reaction rate in conjunction with an effectiveness factor to account for intraparticle diffusion of gas species. This approach involves the use of a general modulus (M_T) and using the first-order curve of effectiveness factor vs M_T. This method was originally referred to as the general asymptotic solution. It has been suggested that a simple Langmuir rate equation is more suitable for modeling the effects of pressure on char reactivity. Therefore, several methods of developing general moduli for the Langmuir rate expression are shown. The general asymptotic …

Twenty-First Annual Outstanding Manuscript Awards, Marie C. Hoepfl

Journal of STEM Teacher Education

No abstract provided.

How Wages Are Set: Uncertain Political Marginal Productivity: Price Theory, Wage Theory, Agency Theory, And The Theory Of The Firm, Thomas C. Lane

University Avenue Undergraduate Journal of Economics

In this paper, I will derive a new model of wage prices by starting with price theory and wage theory and then blending in the cost factors uncovered by agency theory and the theory of the firm, and Alchian's work on economic uncertainty. The final result is still theoretical and cannot be used to predict a specific workers wage, but is nevertheless more complete and realistic in detailing the process of wage determination.

The Gender Wage Gap In The Economics Profession A Search In The Return To Marriage And Fertility Of Ph.D. Economists, Weiyi Shi

University Avenue Undergraduate Journal of Economics

Previous researchers have found that after controlling for various determinants of economists’ earnings, there still remains an unexplained residual wage gap across genders in the economics profession. This study uses 1990 Census data to examine the return to marriage and fertility of male and female Ph.D. economists in an attempt to explain in part the residual gender wage gap in the profession. Marital status is found to have no impact on male or female economists’ earnings. Fertility does not affect male economists' earnings, but is negatively correlated with female economists' earnings. I conclude that the different returns to fertility across …

Electroanalysis Using Differential Pulse Methods And Stripping Techniques., Enda Howard

Masters

Application of a differential pulse waveform to a microelectrode or a rotating disk electrode results in a peaked response for amperometric redox reactions. Based on these observations models were proposed and tested for these methods. Simulations of the models were carried out by inputting the relevant equations into Microsoft Excel. The microelectrode study revealed a good correlation between one model and the numerical derivative of the current following a linear sweep potential waveform. Experimentally the derivative can be obtained numerically following a linear sweep. The alternative differential pulse waveform requires more sophisticated equipment and the response can be affected by …

Additional Quality Factors For The World Wide Web., Ronan Fitzpatrick

Conference papers

Web site development is maturing from the enthusiastic experimental practice of early years to a more professional discipline, addressing the needs of Web site visitors and owner organisations. Quality is central to this maturing and it is necessary to have a full understanding of the meaning of quality in the context of the ever-changing Web. This paper identifies five new quality factors for the Web (visibility, credibility, intelligibility, engagibility and differentiation), together with their characteristics and a checklist of enablers, which can be used by specifiers, designers, developers and evaluators to create quality Web sites.

Estimating Tessellation Parameter Intervals For Rational Curves And Surfaces, Thomas W. Sederberg, Jianmin Zheng

Faculty Publications

This paper presents a method for determining a priori a constant parameter interval with which a rational curve or surface can be tessellated such that the deviation of the curve or surface from its piecewise linear approximation is within a specified tolerance. The parameter interval is estimated based on information about the second order derivatives in the homogeneous coordinates, instead of using affine coordinates directly. This new step size can be found with roughly the same amount of computation as the step size presented in [Cheng 1992], though it can be proven to always be larger than Cheng's step size. …

University Of San Diego Football Media Guide 2000, University Of San Diego Athletics Department

Football (Men)

44 pages : illustrations, portraits ; 21.5 x 28 cm

Undergraduate Bulletin Of The University Of San Diego 2000-2002, University Of San Diego

Undergraduate Course Catalogs (1973- )

228 pages : illustrations, photographs ; 28 cm

California Board Of Accountancy, Shirley S. Prasad, J. D. Fellmeth

California Regulatory Law Reporter

No abstract provided.

The E-Landscape: An Unexplored Goldmine Of The New Millennium, Thow Yick Liang

Research Collection Lee Kong Chian School Of Business

The Internet is an intangible cyberworld created by the human mind. Exploring and exploiting this e-landscape requires a totally redefined mindset. The fact that it exists in the mental realm also makes it a nonlinear system. In this respect, understanding both intangible and nonlinear dynamics is a requisite to the proper exploitation of e-commerce. The e-landscape is a new edge of chaos where order and disorder co-exist. It could be a goldmine for those who swiftly recognize structure in this highly disordered territory. The tremendous number of opportunities and uncertainties embedded in the submerged portion of this iceberg are still …

Policy For Integrated Solid Waste Management In Malaysia, Dennis Jeyakumar

Student Works (2000-2009)

Solid waste management problems have been gaining prominence in Malaysia due to increasing waste generation and the ineffectiveness of the existing mechanism to tackle the problem holistically. This study seeks to formulate a policy for Integrated Solid Waste Management (ISWM) in Malaysia. This has been done by reviewing the legislative and institutional framework as well as the existing practices and trends in Malaysia. Based on this, key issues and needs of solid waste management in Malaysia have been derived. These key issues were then used as a basis to formulate policy instruments to achieve the main objective of ISWM in …

Parallel Computing To Start The Millennium, Joel C. Adams, Chris Nevison, Nan C. Schaller

University Faculty Publications and Creative Works

The experience of three undergraduate computer science programs offering courses on parallel computing is described. On particular, three different solutions to the problem of equipping a lab are discussed. It is shown these solutions may affect the content of the course.

Directional Correlation In Direct And Sequential Double Ionization Of Model Atoms, Stanley L. Haan, N. Hoekema, S. Poniatowski, W. C. Liu

University Faculty Publications and Creative Works

We discuss directional dependence in the time development of spatial wavefunctions, which includes jet formation, for two-electron model atoms exposed to intense laser fields. Two competing scenarios for double ionization are evident: (1) both electrons emerge simultaneously from the core region and on the same side of the nucleus, and (2) the electrons detach on opposite sides but not simultaneously. The importance of the electron-electron repulsion contribution to the competing processes is investigated for various laser intensities.

On Simplicial Commutative Algebras With Vanishing André-Quillen Homology, James M. Turner

University Faculty Publications and Creative Works

In this paper, we study the André-Quillen homology of simplicial commutative ℓ-algebras, ℓ a field, having certain vanishing properties. When ℓ has non-zero characteristic, we obtain an algebraic version of a theorem of J.-P. Serre and Y. Umeda that characterizes such simplicial algebras having bounded homotopy groups. We further discuss how this theorem fails in the rational case and, as an application, indicate how the algebraic Serre theorem can be used to resolve a conjecture of D. Quillen for algebras of finite type over Noetherian rings, having non-zero characteristic.

An Empirical Analysis Of Unit Trust Performance In Singapore, Joseph H. H. Chia, Yiu Kuen Tse

Research Collection School Of Economics

The Singapore government’s recent strategic plan to develop the financial sector has placed much emphasis on the fund management industry. In this paper we examine the unit trust performance in Singapore in the 90s. Our results show that fund managers in general performed poorly in security analysis and market timing. However, they performed fairly well in risk-adjusted returns and generally maintained well-diversified portfolios. We find that there is little consistency in the performance ranking of the evaluated portfolios, although there is evidence of repeat performance of some top funds. Our analysis also shows that fund managers could indeed make excess …

2000-2001 Just The Facts, University Of San Diego

USD Fact Books (1985- )

No abstract provided.

Recovered And Continuous Memories Of Childhood Sexual Abuse: A Quantitative And Qualitative Analysis, Linda Ribble Stoler

Open Access Dissertations

This study is an in-depth examination of women who reported childhood sexual abuse (CSA). Among a non-clinical sample of 26 women, ages 22 - 65, 11 reported they had always remembered CSA (continuous memories) and 15 reported they had forgotten CSA for some period of their lives (delayed memories). Participants completed a questionnaire which included demographics, abuse history, therapy history, symptom checklists, Family Functioning Scale, Dissociative Experiences Scale, and the Adult Sexual Victimization Scale, and were then interviewed. Eighty-six percent of women with delayed, and 46% with continuous, memories reported corroboration. Only one woman reported a therapist was the first …

A Review Essay: Limits Of Gaylaw, Dale Carpenter

Faculty Journal Articles and Book Chapters

Part of Professor William Eskridge's mission in Gaylaw (Gaylaw: Challenging the Apartheid of the Closet by William N. Eskridge, Jr., Harvard University Press, 1999) is to describe the historical development of the complex legal and, to some extent the cultural, landscape for gays. (pp. 17-137) Though not much of Eskridge's presentation of the history of American law's treatment of gays draws from original research, its synthesis of the available secondary sources is a useful contribution and will likely become a staple of classes treating the subject.

The larger part of Gaylaw is the book's greatest challenge and the place where …

Evaluation Of Transient And Highly Localized Acoustic Fields Using Acoustooptic Phase Contrast Imaging, Gregory T. Clement

Open Access Dissertations

No abstract provided.

The Engineering Feasibility Of A Tidal Siphon, And Alternative To The Jetty Hardened Coastal Inlet, Nicholas De Gennaro

Open Access Dissertations

No abstract provided.

Boundedness, Global Stability, And Periodicity Of Some Difference Equations, Norman Ray Prokup

Open Access Dissertations

No abstract provided.

Unitary And Hermitian Fractional Operators And Their Extensions: Fractional Mellin Transform, Joint Fractional Representations And Fractional Correlations, Olcay Akay

Open Access Dissertations

No abstract provided.

Interactive Self-Modeling Mixture Analysis Using Principal Component Approach, Dongsheng Bu

Open Access Dissertations

No abstract provided.

Multispecies Modeling Of The Georges Bank Fish Community, Tien-Shui Tsou

Open Access Dissertations

No abstract provided.

Early Estimates Of The Economic Impacts During Microelectronics Product Design, Zhongwei Wang

Open Access Dissertations

No abstract provided.

Application Of Wavelets And Principal Component Analysis In Image Query And Mammography, Sol Neeman

Open Access Dissertations

No abstract provided.

The Relationships Of Organizational Personality Variables With Worker Socio-Communicative Orientation, Communication Apprehension, Immediacy, And Job Satisfaction., Heather Teresa Smith

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study examined the organizational personality types of "upward mobile," "ambivalent," and "indifferent" with reference to their relationships with worker sociocommunicative orientation, communication apprehension, immediacy, and job satisfaction. The study examined self-report data from the measures of organizational personality scales, job satisfaction, communication apprehension, immediacy, and assertiveness/responsiveness. The study found that each of the three personality variables have unique relationships (some linear, some non-linear) with communication apprehension, immediacy, assertiveness, responsiveness, and job satisfaction.

A Model To Predict The Long-Term Strength Of E-Glass Fiber Composites Subjected To Environmental Exposure., Thomas Miles Damiani

Graduate Theses, Dissertations, and Problem Reports (ETD)

Glass Fiber Reinforced Plastics (FRP) are being used in an increasing number of structures and machines because of their advantages over conventional materials such as steel or aluminum. However, sustained exposure to seemingly nominal service conditions can act to degrade the strength of an FRP composite, potentially negating the advantages of their use. This research sought to develop a theoretical model to predict the long-term strength of an FRP composite subjected to environmental exposure. Degradation models for the reinforcement fibers and the interphase region were developed and verified using existing data. The two constituent models were combined through the modification …