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Articles 2161 - 2190 of 2640
Full-Text Articles in Physical Sciences and Mathematics
What Kind Of Thing Is A Number?: A Talk With Reuben Hersh, Reuben Hersh
What Kind Of Thing Is A Number?: A Talk With Reuben Hersh, Reuben Hersh
Humanistic Mathematics Network Journal
No abstract provided.
Math Lingo Vs. Plain English: Multiple Entendre, Stephen I. Brown
Math Lingo Vs. Plain English: Multiple Entendre, Stephen I. Brown
Humanistic Mathematics Network Journal
No abstract provided.
Abe Shenitzer At 75, Hardy Grant
Abe Shenitzer At 75, Hardy Grant
Humanistic Mathematics Network Journal
No abstract provided.
A Brief Tribute To Π, J. D. Phillips
A Brief Tribute To Π, J. D. Phillips
Humanistic Mathematics Network Journal
No abstract provided.
Reminiscences Of Paul Erdös (1913-1996), Melvin Henriksen
Reminiscences Of Paul Erdös (1913-1996), Melvin Henriksen
Humanistic Mathematics Network Journal
No abstract provided.
Sand Songs: The Formal Languages Of Warlpiri Iconography, James V. Rauff
Sand Songs: The Formal Languages Of Warlpiri Iconography, James V. Rauff
Humanistic Mathematics Network Journal
No abstract provided.
Book Review: The Crest Of The Peacock: Non-European Roots Of Mathematics,By George Gheverghese Joseph, Bernadette Anne Berken
Book Review: The Crest Of The Peacock: Non-European Roots Of Mathematics,By George Gheverghese Joseph, Bernadette Anne Berken
Humanistic Mathematics Network Journal
No abstract provided.
Illumination And Geometry In Islamic Art, Salma Marani
Illumination And Geometry In Islamic Art, Salma Marani
Humanistic Mathematics Network Journal
No abstract provided.
Al-Khawarizmi's Algebra: The First Paradigm In Algebra, Murad Jurdak
Al-Khawarizmi's Algebra: The First Paradigm In Algebra, Murad Jurdak
Humanistic Mathematics Network Journal
No abstract provided.
See-Duction: How Scientists And Artists Are Creating A Third Way Of Knowing, Howard Levine
See-Duction: How Scientists And Artists Are Creating A Third Way Of Knowing, Howard Levine
Humanistic Mathematics Network Journal
No abstract provided.
Curriculum Development Via Literary And Musical Forms, Joel K. Haack
Curriculum Development Via Literary And Musical Forms, Joel K. Haack
Humanistic Mathematics Network Journal
No abstract provided.
Algebra Anyone?, Leslie Jones, Ted Panitz, Walter Burlage
Algebra Anyone?, Leslie Jones, Ted Panitz, Walter Burlage
Humanistic Mathematics Network Journal
No abstract provided.
Mathematical Rebuses, Arthur V. Johnson Ii
Mathematical Rebuses, Arthur V. Johnson Ii
Humanistic Mathematics Network Journal
No abstract provided.
The First Cams Project: A Humanistic Endeavor, Barbara A. Wainwright, Homer W. Austin
The First Cams Project: A Humanistic Endeavor, Barbara A. Wainwright, Homer W. Austin
Humanistic Mathematics Network Journal
No abstract provided.
Book Reviews: Uncommon Sense, By Alan Cromer, And The Physics Of Immortality, By Frank J. Tipler, Harald M. Ness
Book Reviews: Uncommon Sense, By Alan Cromer, And The Physics Of Immortality, By Frank J. Tipler, Harald M. Ness
Humanistic Mathematics Network Journal
No abstract provided.
Calculation Of Electronic Coupling Matrix Elements For Ground And Excited State Electron Transfer Reactions: Comparison Of The Generalized Mulliken–Hush And Block Diagonalization Methods, Robert J. Cave, Marshall D. Newton
Calculation Of Electronic Coupling Matrix Elements For Ground And Excited State Electron Transfer Reactions: Comparison Of The Generalized Mulliken–Hush And Block Diagonalization Methods, Robert J. Cave, Marshall D. Newton
All HMC Faculty Publications and Research
Two independent methods are presented for the nonperturbative calculation of the electronic coupling matrix element (Hab) for electron transfer reactions using ab initio electronic structure theory. The first is based on the generalized Mulliken–Hush (GMH) model, a multistate generalization of the Mulliken Hush formalism for the electronic coupling. The second is based on the block diagonalization (BD) approach of Cederbaum, Domcke, and co-workers. Detailed quantitative comparisons of the two methods are carried out based on results for (a) several states of the system Zn2OH2+ and (b) the low-lying states of the benzene–Cl atom complex and its contact ion pair. Generally …
Was Newton's Calculus A Dead End? The Continental Influence Of Maclaurin's Treatise Of Fluxions, Judith V. Grabiner
Was Newton's Calculus A Dead End? The Continental Influence Of Maclaurin's Treatise Of Fluxions, Judith V. Grabiner
Pitzer Faculty Publications and Research
We will show that Maclaurin's Treatise of Fluxions did develop important ideas and techniques and that it did influence the mainstream of mathematics. The Newtonian tradition in calculus did not come to an end in Maclaurin's Britain. Instead, Maclaurin's Treatise served to transmit Newtonian ideas in calculus, improved and expanded, to the Continent. We will look at what these ideas were, what Maclaurin did with them, and what happened to this work afterwards. Then, we will ask what by then should be an interesting question: why has Maclaurin's role been so consistently underrated? Thse questions will involve general matters of …
Optimization Of Plasmas For Recombination-Pumped Short-Wavelength Lasers, M. Murphy, C. Glasheen, F. A. Moscatelli, Thomas D. Donnelly
Optimization Of Plasmas For Recombination-Pumped Short-Wavelength Lasers, M. Murphy, C. Glasheen, F. A. Moscatelli, Thomas D. Donnelly
All HMC Faculty Publications and Research
We report on experiments investigating the optimization of laser-ablated plasmas which are used to produce recombination-pumped, short-wavelength lasers. We evaluate the density of electrons and neutral atoms in laser ablated lithium and carbon plasmas as a function of time and distance away from the ablated target surface. We use an interferometric technique which can reveal information about the temperature of the plasma electrons. We find that the cold electrons which result in gain in recombination-pumped lithium lasers on the Lyman-α transition are produced by the high-intensity pump pulse rather than the lower intensity ablating pulse.
Photoluminescence Properties Of Silicon Quantum-Well Layers, Peter N. Saeta, A. C. Gallagher
Photoluminescence Properties Of Silicon Quantum-Well Layers, Peter N. Saeta, A. C. Gallagher
All HMC Faculty Publications and Research
Nanometer-scale crystal silicon films surrounded by SiO2 were prepared by oxidizing silicon-on-insulator substrates prepared from SIMOX (separation by implantation of oxygen) and crystallized hydrogenated amorphous silicon films. Average silicon layer thickness was determined from reflection spectra. When sufficiently thin (<2 >nm), all layers emitted red photoluminescence under blue and UV cw excitation, with a spectrum that did not depend on the mean layer thickness. The spectrum was roughly Gaussian with a peak energy of 1.65 eV, which is lower than for most porous silicon spectra. The time scale for the luminescence decay was ~35 μs at room temperature and …2>
Diagonal Operators, S-Numbers, And Bernstein Pairs, Asuman Güven Aksoy, Grzegorz Lewicki
Diagonal Operators, S-Numbers, And Bernstein Pairs, Asuman Güven Aksoy, Grzegorz Lewicki
CMC Faculty Publications and Research
Replacing the nested sequence of ''finite" dimensional subspaces by the nested sequence of "closed" subspaces in the classical Bernstein lethargy theorem, we obtain a version of this theorem for the space B(X , Y) of all bounded linear maps. Using this result and some properties of diagonal operators, we investigate conditions under which a suitable pair of Banach spaces form an exact Bernstein pair.We also show that many "classical" Banach spaces, including the couple (Lp [O, 1] , Lq[O, 1]) form a Bernstein pair with respect to any sequence of s-numbers (sn) ,for 1 < p < ∞ and 1 ≤ q < ∞ …
Jamaican Cave Vertebrates, Donald A. Mcfarlane
Jamaican Cave Vertebrates, Donald A. Mcfarlane
WM Keck Science Faculty Papers
Limestone caves in the tropics are typically associated with a more diverse assemblage of vertebrates than are caves in temperate regions. Chapman [87] for example, has reported 37 species from the caves of Gunung Mulu National Park, Sarawak, whereas Bailey [43] lists only 13 for the equally cavernicolous Guadeloupe Mountains National Park, New Mexico, USA. Twenty-eight vertebrate species have been recorded from Jamaican caves. The relative importance of the five Classes differ in these three areas as shown in Table 1 (overleaf).
Adaptive Multicast Routing In Wormhole Networks, Ran Libeskind-Hadas, Tom Hehre '96, Andrew Hutchings '98, Mark Reyes '98, Kevin Watkins '97
Adaptive Multicast Routing In Wormhole Networks, Ran Libeskind-Hadas, Tom Hehre '96, Andrew Hutchings '98, Mark Reyes '98, Kevin Watkins '97
All HMC Faculty Publications and Research
Multicast communication has applications in a number of fundamental operations in parallel computing. An effective multicast routing algorithm must be free from both livelock and deadlock while minimizing communication latency. We describe two classes of multicast wormhole routing algorithms that employ the multi-destination wormhole hardware mechanism proposed by Lin et al. [12] and Panda et al. [17]. Specific examples of these classes of algorithms are described and experimental results suggests that such algorithms enjoy low communication latencies across a range of network loads.
The Interaction Of A Point Vortex With A Wall-Bounded Vortex Layer, Oliver V. Atassi, Andrew J. Bernoff, Seth Lichter
The Interaction Of A Point Vortex With A Wall-Bounded Vortex Layer, Oliver V. Atassi, Andrew J. Bernoff, Seth Lichter
All HMC Faculty Publications and Research
The interaction of a point vortex with a layer of constant vorticity, bounded below by a wall and above by an irrotational flow, is investigated as a model of vortex–boundary layer interaction. This model calculates both the evolution of the interface which separates the vortex layer from the irrotational flow and the trajectory of the vortex. In order to determine the conditions which lead to sustained unsteady interaction, three cases are investigated where the mutual interaction between the vortex and interface is initially assumed to be weak. (i) When a weak point vortex lies outside the layer, the vortex moves …
Positive Solution Curves Of Semipositone Problems With Concave Nonlinearities, Alfonso Castro, Sudhasree Gadam, Ratnasingham Shivaji
Positive Solution Curves Of Semipositone Problems With Concave Nonlinearities, Alfonso Castro, Sudhasree Gadam, Ratnasingham Shivaji
All HMC Faculty Publications and Research
We consider the positive solutions to the semilinear equation:
-Δu(x) = λf(u(x)) for x ∈ Ω
u(x) = 0 for x ∈ ∂Ω
where Ω denotes a smooth bounded region in RN (N > 1) and λ > 0. Here f :[0, ∞)→R is assumed to be monotonically increasing, concave and such that f(0) < 0 (semipositone). Assuming that f'(∞) ≡ lim t→∞ f'(t) > 0, we establish the stability and uniqueness of large positive solutions in terms of (f(t)/t)'. When Ω is a ball, we determine the exact number of positive solutions for each λ > 0. We also obtain the geometry of the branches of positive solutions completely and establish how …
Optical Polarimetry, High–Resolution Spectroscopy And Ir Analysis Of The Chamaeleon I Dark Cloud, E. Covino, E. Palazzi, Bryan E. Penprase, H. E. Schwarz, L. Terranegra
Optical Polarimetry, High–Resolution Spectroscopy And Ir Analysis Of The Chamaeleon I Dark Cloud, E. Covino, E. Palazzi, Bryan E. Penprase, H. E. Schwarz, L. Terranegra
Pomona Faculty Publications and Research
We present optical polarimetry and high resolution spectroscopy of a sample of stars toward the Chamaeleon I dark cloud. We use our polarimetry which includes 33 stars to study the wavelength dependence of the degree and position angle of polarization.
From our data we found, by interpretation of the various correlations between the polarimetry, photometry and IRAS fluxes, the following:
the probable presence of shocked molecular gas; a warm molecular CH component; small dust grains at the edges of the cloud, and larger grains in the central parts, which are causing the polarization.
Our results provide a consistent picture of …
Magnetic Levitation And Noncoalescence Of Liquid Helium, M. A. Weilert, Dwight L. Whitaker, H. J. Maris, G. M. Seidel
Magnetic Levitation And Noncoalescence Of Liquid Helium, M. A. Weilert, Dwight L. Whitaker, H. J. Maris, G. M. Seidel
Pomona Faculty Publications and Research
We describe experiments in which drops of liquid helium-4, as large as 2 cm in diameter, are magnetically levitated. We have found that, when two or more drops are levitated in the same magnetic trap, the drops often remain in a state of apparent contact without coalescing. It appears that this effect is caused by the slow evaporation of liquid from the drops.
From The Editor, Issue 14, 1996, Alvin White
From The Editor, Issue 14, 1996, Alvin White
Humanistic Mathematics Network Journal
No abstract provided.
What's All The Fuss About?, Sherman K. Stein
What's All The Fuss About?, Sherman K. Stein
Humanistic Mathematics Network Journal
No abstract provided.
The Triex: Explore, Extract, Explain, Sherman K. Stein
The Triex: Explore, Extract, Explain, Sherman K. Stein
Humanistic Mathematics Network Journal
No abstract provided.
Noesis, Lee Goldstein