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Articles 2341 - 2370 of 2640
Full-Text Articles in Physical Sciences and Mathematics
Canadian Society For History And Philosophy Mathematics Speaker List
Canadian Society For History And Philosophy Mathematics Speaker List
Humanistic Mathematics Network Journal
No abstract provided.
The Role Of Faith In Mathematics, Dick Wood
The Role Of Faith In Mathematics, Dick Wood
Humanistic Mathematics Network Journal
No abstract provided.
Math Nonsence Verse, Helen Lewy
Math Nonsence Verse, Helen Lewy
Humanistic Mathematics Network Journal
No abstract provided.
A Reading List For Undergraduate Mathematics Majors: A Personal View, Paul Froeschl
A Reading List For Undergraduate Mathematics Majors: A Personal View, Paul Froeschl
Humanistic Mathematics Network Journal
No abstract provided.
Developing A Mathematical Mode Of Thinking In An Undergraduate Program, Ida Doraiswamy
Developing A Mathematical Mode Of Thinking In An Undergraduate Program, Ida Doraiswamy
Humanistic Mathematics Network Journal
No abstract provided.
On Attracting Mathematics Majors, Kazem Mahdavi
On Attracting Mathematics Majors, Kazem Mahdavi
Humanistic Mathematics Network Journal
No abstract provided.
The Basis For The Success Of The Potsdam Program, Rick Luttmann
The Basis For The Success Of The Potsdam Program, Rick Luttmann
Humanistic Mathematics Network Journal
No abstract provided.
Mathematics And The Arts — A Bibliography, Joanne S. Growney
Mathematics And The Arts — A Bibliography, Joanne S. Growney
Humanistic Mathematics Network Journal
No abstract provided.
A Humanistic Academic Environment For Learning Undergraduate Mathematics, Clarence F. Stephens
A Humanistic Academic Environment For Learning Undergraduate Mathematics, Clarence F. Stephens
Humanistic Mathematics Network Journal
No abstract provided.
Liberal Education In The Liberal Sense, Annalisa Crannell
Liberal Education In The Liberal Sense, Annalisa Crannell
Humanistic Mathematics Network Journal
No abstract provided.
The Popular Image Of Mathematics, Paul Ernest
The Popular Image Of Mathematics, Paul Ernest
Humanistic Mathematics Network Journal
No abstract provided.
Poems, Lee Goldstein
A Multicultural Matrix For Mathematics Education: Generic Ideas, Rheta N. Rubenstein
A Multicultural Matrix For Mathematics Education: Generic Ideas, Rheta N. Rubenstein
Humanistic Mathematics Network Journal
No abstract provided.
On Learning In The Mathematical Sciences: Statistics 200 As A Paradigm Of Everything Wrong In Mathematical Education, James M. Cargal
On Learning In The Mathematical Sciences: Statistics 200 As A Paradigm Of Everything Wrong In Mathematical Education, James M. Cargal
Humanistic Mathematics Network Journal
No abstract provided.
In Fin Ity, Bonnie Shulman
In Fin Ity, Bonnie Shulman
Humanistic Mathematics Network Journal
No abstract provided.
Are There Revolutions In Mathematics, Paul Ernest
Are There Revolutions In Mathematics, Paul Ernest
Humanistic Mathematics Network Journal
No abstract provided.
A Fairy Tale: Being A Pseudo-History Of Mathematics With Special Attention Given To The Evolution Of The Number System, Peter Flusser
A Fairy Tale: Being A Pseudo-History Of Mathematics With Special Attention Given To The Evolution Of The Number System, Peter Flusser
Humanistic Mathematics Network Journal
No abstract provided.
Primary Relaxation Processes At The Band Edge Of Sio₂, Peter N. Saeta, Benjamin I. Greene
Primary Relaxation Processes At The Band Edge Of Sio₂, Peter N. Saeta, Benjamin I. Greene
All HMC Faculty Publications and Research
The kinetics of photoinduced defect formation in high-purity silicas has been studied by femtosecond transient absorption spectroscopy in the visible and ultraviolet. Band edge two-photon excitation produces singlet excitons which decay in 0.25 ps into defects with the absorption spectra of nonbridging oxygen hole centers (≡Si-O⋅) and silicon E’ centers (≡Si⋅). We identify these defect pairs with the self-trapped triplet exciton and the 0.25 ps decay with the motion of the photoexcited oxygen atom. Similar results were obtained with both crystalline and amorphous silica samples.
Uniqueness And Stability Of Nonnegative Solutions For Semipositone Problems In A Ball, Ismael Ali, Alfonso Castro, Ratnasingham Shivaji
Uniqueness And Stability Of Nonnegative Solutions For Semipositone Problems In A Ball, Ismael Ali, Alfonso Castro, Ratnasingham Shivaji
All HMC Faculty Publications and Research
We study the uniqueness and stability of nonnegative solutions for classes of nonlinear elliptic Dirichlet problems on a ball, when the nonlinearity is monotone, negative at the origin, and either concave or convex.
A Theoretical Investigation Of The Geometries, Vibrational Frequencies, And Binding Energies Of Several Alkali Halide Dimers, Robert P. Dickey '93, David Maurice '91, Robert J. Cave, Richard J. Mawhorter
A Theoretical Investigation Of The Geometries, Vibrational Frequencies, And Binding Energies Of Several Alkali Halide Dimers, Robert P. Dickey '93, David Maurice '91, Robert J. Cave, Richard J. Mawhorter
All HMC Faculty Publications and Research
Results are presented from ab initio calculations on the symmetrical alkali halide dimers made up of Li, Na, K, F, and Cl. We examine the sensitivity of representative monomer and dimer geometries to the variation of the basis set with and without polarization and diffuse functions. The geometries are then compared with available experimental results. We have also calculated vibrational frequencies at the restricted Hartree–Fock level and examined the changes in geometry brought about by correlation using second‐order Møller–Plesset perturbation theory. It is found that Hartree–Fock theory in a modest basis set with diffuse and polarization functions yields results comparable …
Properties Of Photon Density Waves In Multiple-Scattering Media, Bruce J. Tromberg, Lars O. Svaasand, Tsong-Tseh Tsay, Richard C. Haskell
Properties Of Photon Density Waves In Multiple-Scattering Media, Bruce J. Tromberg, Lars O. Svaasand, Tsong-Tseh Tsay, Richard C. Haskell
All HMC Faculty Publications and Research
Amplitude-modulated light launched into multiple-scattering media, e.g., tissue, results in the propagation of density waves of diffuse photons. Photon density wave characteristics in turn depend on modulation frequency (ω) and media optical properties. The damped spherical wave solutions to the homogeneous form of the diffusion equation suggest two distinct regimes of behavior: (1) a highfrequency dispersion regime where density wave phase velocity Vp has a ω dependence and (2) a low-frequency domain where Vp is frequency independent. Optical properties are determined for various tissue phantoms by fitting the recorded phase (Φ) and modulation (m) response to …
Tissue Characterization And Imaging Using Photon Density Waves, Lars O. Svaasand, Bruce J. Tromberg, Richard C. Haskell, Tsong-Tseh Tsay, Michael W. Berns
Tissue Characterization And Imaging Using Photon Density Waves, Lars O. Svaasand, Bruce J. Tromberg, Richard C. Haskell, Tsong-Tseh Tsay, Michael W. Berns
All HMC Faculty Publications and Research
The optical properties of brain tissues have been evaluated by measuring the phase velocity and attenuation of harmonically modulated light. The phase velocity for photon density waves at 650-nm wavelength has been found to be in the range of 5 to 12% of the corresponding velocity in a nonscattering medium, and the optical penetration depth was in the range 2.9 to 5.2 mm. These results are used to predict the resolution of optical imaging of deep tissue structures by diffusely propagating incoherent photons. The results indicate that structures of a few millimeters in linear dimension can be identified at 10 …
Optimal Leapfrogging, Joel Auslander, Arthur T. Benjamin, Daniel S. Wilkerson
Optimal Leapfrogging, Joel Auslander, Arthur T. Benjamin, Daniel S. Wilkerson
All HMC Faculty Publications and Research
No abstract provided in this article.
Amblyrhiza And The Vertebrate Paleontology Of Anguillean Caves, Donald A. Mcfarlane, Ross D. E. Macphee
Amblyrhiza And The Vertebrate Paleontology Of Anguillean Caves, Donald A. Mcfarlane, Ross D. E. Macphee
WM Keck Science Faculty Papers
Recorded interest in the caves of Anguilla dates back to the second half of the nineteenth century. The earliest explorations were concerned with the locating phosphatic cave earths, and resulted in the mining of several sites. Incidental to this work, the bones of the largest island rodent ever discovered were collected from Aguillan caves. Whereas the phosphate mining operations were short-lived, the remains of the giant rodent Amblyrhiza have catalyzed a continued interest in the caves of Anguilla. The most recent series of explorations have provided the first adequate documentation of Amhlyrhiza fossil sites, and have started to yield radiometric …
An Elementary Approach To Some Analytic Asymptotics, Nicholas Pippenger
An Elementary Approach To Some Analytic Asymptotics, Nicholas Pippenger
All HMC Faculty Publications and Research
Fredman and Knuth have treated certain recurrences, such as $M(0) = 1$ and\[M(n + 1) = \mathop {\min }\limits_{0 \leqslant k \leqslant n} (\alpha M(k) + \beta M(n - k)),\] where $\min (\alpha ,\beta ) > 1$, by means of auxiliary recurrences such as \[h(x) = \left\{ {\begin{array}{*{20}c} {0\qquad {\text{if}}0 \leqslant x < 1,} \\ {1 + h({x / \alpha }) + h({x / \beta }){\text{ if}}1 \leq x < \infty .} \\ \end{array} } \right.\] The asymptotic behavior of $h(x)$ as $x \to \infty $ with $\alpha $ and $\beta $ fixed depends on whether ${{\log \alpha } / {\log \alpha }}$ is rational or irrational.
The solution of Fredman and Knuth used analytic methods in both cases, and used in particular the Wiener–Ikehara Tauberian theorem in the irrational case. The author shows that a more explicit solution to these recurrences can be obtained by entirely elementary methods, based on a geometric interpretation of $h(x)$ …
Light-Scattering Technique For The Study Of Dynamic Thickness Fluctuations In Thin Liquid Films, Richard C. Haskell, Daniel C. Petersen, Mark W. Johnson
Light-Scattering Technique For The Study Of Dynamic Thickness Fluctuations In Thin Liquid Films, Richard C. Haskell, Daniel C. Petersen, Mark W. Johnson
All HMC Faculty Publications and Research
The authors describe a light-scattering technique capable of probing the dynamics of thickness fluctuations in lipid bilayers. The technique, which they call reflectance fluctuation spectroscopy (RFS), is keenly sensitive to light scattered from the squeeze modes of motion in a thin liquid film, and insensitive to light scattered from the bend modes. A laser beam is focused to a small spot on the film, and the power in the specularly reflected beam is recorded in real time. Thickness fluctuations associated with the squeeze modes of motion give rise to fluctuations in the power of the specularly reflected light. The frequency …
Light-Scattering Technique For The Study Of Dynamic Thickness Fluctuations In Thin Liquid Films, Richard C. Haskell, Daniel C. Petersen, Mark W. Johnson
Light-Scattering Technique For The Study Of Dynamic Thickness Fluctuations In Thin Liquid Films, Richard C. Haskell, Daniel C. Petersen, Mark W. Johnson
All HMC Faculty Publications and Research
The authors describe a light-scattering technique capable of probing the dynamics of thickness fluctuations in lipid bilayers. The technique, which they call reflectance fluctuation spectroscopy (RFS), is keenly sensitive to light scattered from the squeeze modes of motion in a thin liquid film, and insensitive to light scattered from the bend modes. A laser beam is focused to a small spot on the film, and the power in the specularly reflected beam is recorded in real time. Thickness fluctuations associated with the squeeze modes of motion give rise to fluctuations in the power of the specularly reflected light. The frequency …
A Bifurcation Theorem And Applications, Alfonso Castro, Jorge Cossio
A Bifurcation Theorem And Applications, Alfonso Castro, Jorge Cossio
All HMC Faculty Publications and Research
In this paper we give a sufficient condition on the nonlinear operator N for a point (λ, u) to be a local bifurcation point of equations of the form u + λL-1(N(u)) = 0, where L is a linear operator in a real Hilbert space, L has compact inverse, and λ ∈ R is a parameter. Our result does not depend on the variational structure of the equation or the multiplicity of the eigenvalue of the linear operator L. Applications are made to systems of differential equations and to the existence of periodic solutions of nonlinear second order …
Topologies And Cotopologies Generated By Sets Of Functions, Alan Dow, Melvin Henriksen, Ralph Kopperman, R. G. Woods
Topologies And Cotopologies Generated By Sets Of Functions, Alan Dow, Melvin Henriksen, Ralph Kopperman, R. G. Woods
All HMC Faculty Publications and Research
Let L be either [0, 1] or {0, 1} with the usual order. We study topologies on a set X for which the cozero-sets of certain subfamilies H of Lx form a base, and the properties imposed on such topologies by hypothesizing various order-theoretic conditions on H. We thereby obtain useful generalizations of extremely disconnected spaces, basically disconnected spaces, and F-spaces. In particular we use these tools to study the space of minimal prime ideals of certain commutative rings.