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Articles 31 - 60 of 2555
Full-Text Articles in Physical Sciences and Mathematics
Late Quaternary Fossil Mammals And Last Occurrence Dates From Caves At Barahona, Puerto Rico, Donald A. Mcfarlane
Late Quaternary Fossil Mammals And Last Occurrence Dates From Caves At Barahona, Puerto Rico, Donald A. Mcfarlane
WM Keck Science Faculty Papers
Puerto Rico supported at least five genera of endemic terrestrial mammals in the late Quaternary, all of which are extinct. Whether these animals died out in the late Pleistocene, the mid-Holocene, or in post-Columbian time has not been established. This paper is the first attempt at radiometrically dating the 'last occurrences' of these taxa, together with the first unambiguous descriptions of localities reported by previous workers. Last occurrence dates for Nesophontes, Elasmodontomys and Heteropsomys are shown to be mid-Holocene and overlap with Amerindian occupation of the island. Acratocnus is known only from the late Pleistocene. No Puerto Rican taxon has …
Anneli Lax: In Memoriam, Elena Anne Corie Marchisotto
Anneli Lax: In Memoriam, Elena Anne Corie Marchisotto
Humanistic Mathematics Network Journal
No abstract provided.
Teaching A Humanities Course: A Mathematician’S View, Bill Marion
Teaching A Humanities Course: A Mathematician’S View, Bill Marion
Humanistic Mathematics Network Journal
No abstract provided.
Word Problems, Don Pfaff
A Response To Dancis, Margaret Schaffer
A Response To Dancis, Margaret Schaffer
Humanistic Mathematics Network Journal
No abstract provided.
Another Response To Dancis, Ted Eisenberg
Another Response To Dancis, Ted Eisenberg
Humanistic Mathematics Network Journal
No abstract provided.
Evaluation In The Mathematics Classroom, Emam Hoosain, B. Naraine
Evaluation In The Mathematics Classroom, Emam Hoosain, B. Naraine
Humanistic Mathematics Network Journal
No abstract provided.
What Is The Thing Called “Humanistic Mathematics?”, Tamar Apel
What Is The Thing Called “Humanistic Mathematics?”, Tamar Apel
Humanistic Mathematics Network Journal
No abstract provided.
Mathematics Is An Art: The Story Of A One-Time Course, Paul Fjelstad
Mathematics Is An Art: The Story Of A One-Time Course, Paul Fjelstad
Humanistic Mathematics Network Journal
No abstract provided.
A Reflection On The Word: Remembering The Word “Word” Is Reflexive, Paul Fjelstad, Ivan Ginchev
A Reflection On The Word: Remembering The Word “Word” Is Reflexive, Paul Fjelstad, Ivan Ginchev
Humanistic Mathematics Network Journal
No abstract provided.
Calculus For The Liberal Arts: A Humanistic Approach, Kathleen Shannon
Calculus For The Liberal Arts: A Humanistic Approach, Kathleen Shannon
Humanistic Mathematics Network Journal
No abstract provided.
Ode To Mathematics, Sandra Z. Keith
Ode To Mathematics, Sandra Z. Keith
Humanistic Mathematics Network Journal
No abstract provided.
Excerpts From Ivan’S Commandments To Himself, Ivan Niven
Excerpts From Ivan’S Commandments To Himself, Ivan Niven
Humanistic Mathematics Network Journal
No abstract provided.
Divisibility: A Problem Solving Approach Through Generalizing And Specializing, Rina Zazkis
Divisibility: A Problem Solving Approach Through Generalizing And Specializing, Rina Zazkis
Humanistic Mathematics Network Journal
No abstract provided.
The Role Of Values In Mathematics Education, Murad Jurdak
The Role Of Values In Mathematics Education, Murad Jurdak
Humanistic Mathematics Network Journal
No abstract provided.
Book Review: A Tour Of The Calculus By David Berlinski, Bernard Fleishman
Book Review: A Tour Of The Calculus By David Berlinski, Bernard Fleishman
Humanistic Mathematics Network Journal
No abstract provided.
Book Review: Mathematical Reflections By Peter Hilton, Derek Holton And Jean Pedersen, Ladnor Geissinger
Book Review: Mathematical Reflections By Peter Hilton, Derek Holton And Jean Pedersen, Ladnor Geissinger
Humanistic Mathematics Network Journal
No abstract provided.
Roots, Don Pfaff
Tea Tasting And Pascal Triangles, Paul Alper, Yongzhi Yang
Tea Tasting And Pascal Triangles, Paul Alper, Yongzhi Yang
Humanistic Mathematics Network Journal
No abstract provided.
Measurement Of TC Suppression In Tungsten Using Magnetic Impurities, Betty A. Young, T. Saab, Blas Cabrera, J. J. Cross, R. M. Clarke, R. A. Abusaidi
Measurement Of TC Suppression In Tungsten Using Magnetic Impurities, Betty A. Young, T. Saab, Blas Cabrera, J. J. Cross, R. M. Clarke, R. A. Abusaidi
Physics
We have measured the effects of dilute magnetic-atom doping on the superconducting transition temperature of tungsten thin films. Our “Tc tuning” technique is accurate, precise, and simple. Experiments were performed using dc-magnetron-sputtered tungsten films with undoped values of Tc in the range of 70–150 mK. The magnetic-atom doping was achieved using ion implantation. Specific Tc suppressions of between 5% and 65% were targeted and observed in this study. The transition width of each undoped sample was ≈1 mK and the transition widths remained sharp after implantation with 56Fe+ ions. Our data are in good agreement …
Characterizations Of Classes Of Programs By Three-Valued Operators, Anthony K. Seda, Pascal Hitzler
Characterizations Of Classes Of Programs By Three-Valued Operators, Anthony K. Seda, Pascal Hitzler
Computer Science and Engineering Faculty Publications
Several important classes of normal logic programs, including the classes of acyclic, acceptable, and locally hierarchical programs, have the property that every program in the class has a unique two-valued supported model. In this paper, we call such classes unique supported model classes. We analyse and characterize these classes by means of operators on three-valued logics. Our studies will motivate the definition of a larger unique supported model class which we call the class of Phi-accessible programs. Finally, we show that the class of Phi -accessible programs is computationally adequate in that every partial recursive function can be implemented by …
Hopf Bifurcation In Models For Pertussis Epidemiology, Herbert W. Hethcote, Yi Li, Zhujun Jing
Hopf Bifurcation In Models For Pertussis Epidemiology, Herbert W. Hethcote, Yi Li, Zhujun Jing
Mathematics and Statistics Faculty Publications
Pertussis (whooping cough) incidence in the United States has oscillated with a period of about four years since data was first collected in 1922. An infection with pertussis confers immunity for several years, but then the immunity wanes, so that reinfection is possible. A pertussis reinfection is mild after partial loss of immunity, but the reinfection can be severe after complete loss of immunity. Three pertussis transmission models with waning of immunity are examined for periodic solutions. Equilibria and their stability are determined. Hopf bifurcation of periodic solutions around the endemic equilibrium can occur for some parameter values in two …
Self-Consistency Algorithms, Thaddeus Tarpey
Self-Consistency Algorithms, Thaddeus Tarpey
Mathematics and Statistics Faculty Publications
The k-means algorithm and the principal curve algorithm are special cases of a self-consistency algorithm. A general self-consistency algorithm is described and results are provided describing the behavior of the algorithm for theoretical distributions, in particular elliptical distributions. The results are used to contrast the behavior of the algorithms when applied to a theoretical model and when applied to finite datasets from the model. The algorithm is also used to determine principal loops for the bivariate normal distribution.
Year In Review - 1999, Annis Water Resources Institute
Year In Review - 1999, Annis Water Resources Institute
AWRI Reviews
No abstract provided.
Towards The Evaluation Of Netcentric Scientific Applications, Shanhani Markus, Elias N. Houstis
Towards The Evaluation Of Netcentric Scientific Applications, Shanhani Markus, Elias N. Houstis
Department of Computer Science Technical Reports
No abstract provided.
Off-Line Compression By Greedy Textual Substitution, Alberto Apostolico, Stefano Lonardi
Off-Line Compression By Greedy Textual Substitution, Alberto Apostolico, Stefano Lonardi
Department of Computer Science Technical Reports
No abstract provided.
String Pattern Matching For A Deluge Survival Kit, Alberto Apostolico, Maxime Crochemore
String Pattern Matching For A Deluge Survival Kit, Alberto Apostolico, Maxime Crochemore
Department of Computer Science Technical Reports
No abstract provided.
Experimental Evaluation Of Design Tradeoff In Specialized Virtual Machine For Multimedia Traffic In Active Networks, Sheng-Yih Wang, Bharat Bhargava
Experimental Evaluation Of Design Tradeoff In Specialized Virtual Machine For Multimedia Traffic In Active Networks, Sheng-Yih Wang, Bharat Bhargava
Department of Computer Science Technical Reports
No abstract provided.
An Adaptable Network Architecture For Multimedia Traffic Management And Control, Sheng-Yih Wang, Bharat Bhargava
An Adaptable Network Architecture For Multimedia Traffic Management And Control, Sheng-Yih Wang, Bharat Bhargava
Department of Computer Science Technical Reports
No abstract provided.
Applications And Algorithms For Least Trimmed Sum Of Absolute Deviations Regression, Douglas M. Hawkins, David Olive
Applications And Algorithms For Least Trimmed Sum Of Absolute Deviations Regression, Douglas M. Hawkins, David Olive
Articles and Preprints
High breakdown estimation (HBE) addresses the problem of getting reliable parameter estimates in the face of outliers that may be numerous and badly placed. In multiple regression, the standard HBE's have been those defined by the least median of squares (LMS) and the least trimmed squares (LTS) criteria. Both criteria lead to a partitioning of the data set's n cases into two “halves” – the covered “half” of cases are accommodated by the fit, while the uncovered “half”, which is intended to include any outliers, are ignored. In LMS, the criterion is the Chebyshev norm of the residuals of the …