3,955 research outputs found
Henri Temianka Correspondence; (wagner)
This collection contains material pertaining to the life, career, and activities of Henri Temianka, violin virtuoso, conductor, music teacher, and author. Materials include correspondence, concert programs and flyers, music scores, photographs, and books.https://digitalcommons.chapman.edu/temianka_correspondence/4232/thumbnail.jp
Roger Wagner in a Senior Voice Recital
This is the program for the senior voice recital of baritone Roger Wagner. Pianist Philip Ingalls accompanied the performance. The recital took place on March 26, 1987
Constraints on Supersymmetric Dark Matter for Heavy Scalar Superpartners
We study the constraints on neutralino dark matter in minimal low energy
supersymmetry models and the case of heavy lepton and quark scalar
superpartners. For values of the Higgsino and gaugino mass parameters of the
order of the weak scale, direct detection experiments are already putting
strong bounds on models in which the dominant interactions between the dark
matter candidates and nuclei are governed by Higgs boson exchange processes,
particularly for positive values of the Higgsino mass parameter mu. For
negative values of mu, there can be destructive interference between the
amplitudes associated with the exchange of the standard CP-even Higgs boson and
the exchange of the non-standard one. This leads to specific regions of
parameter space which are consistent with the current experimental constraints
and a thermal origin of the observed relic density. In this article we study
the current experimental constraints on these scenarios, as well as the future
experimental probes, using a combination of direct and indirect dark matter
detection and heavy Higgs and electroweakino searches at hadron colliders.Comment: 32 pages, 13 figure
High-resolution imaging of kidney vascular corrosion casts with nano-CT
A vascular corrosion cast of an entire mouse kidney was scanned with a modular multiresolution X-ray nanotomography system. Using an isotropic voxel pitch of 0.5 mu m, capillary systems such as the vasa recta, peritubular capillaries and glomeruli were clearly resolved. This represents a considerable improvement over corrosion casts scanned with microcomputed tomography systems. The resolving power of this system was clearly demonstrated by the unique observation of a dense, subcapsular mat of capillaries enveloping the entire outer surface of the cortical region. Resolution of glomerular capillaries was comparable to similar models derived from laser scanning confocal microscopy. The high-resolution, large field of view and the three-dimensional nature of the resulting data opens new possibilities for the use of corrosion casting in research
Spreadsheet-based GIS Models
Geographic Information Systems (GIS), which are computer-based systems that allow decision makers to incorporate geographically based data into their analyses, are widespread and powerful tools in many business and scientific settings today. In this paper, we present a tutorial discussing ways in which GIS functionality can be implemented within the spreadsheet environment. We show the straightforward and natural analogy between several GIS functions with spreadsheet functions, particularly for raster based data. We present two realistic examples meshing OR/MS methods with GIS methods --- an integration which is greatly enhanced by the “remarkable development platform” provided by spreadsheets. We discuss the many benefits of the spreadsheet enabled seamless integration of geographical data, analysis, and display
Spatial spectrograms of vibrating atomic force microscopy cantilevers coupled to sample surfaces
Many advanced dynamic Atomic Force Microscopy (AFM) techniques such as contact resonance, force modulation, piezoresponse force microscopy, electrochemical strain microscopy, and AFM infrared spectroscopy exploit the dynamic response of a cantilever in contact with a sample to extract local material properties. Achieving quantitative results in these techniques usually requires the assumption of a certain shape of cantilever vibration. We present a technique that allows in-situ measurements of the vibrational shape of AFM cantilevers coupled to surfaces. This technique opens up unique approaches to nanoscale material property mapping, which are not possible with single point measurements alone. (C) 2013 AIP Publishing LLC
Accurate Vertical Nanoelectromechanical Measurements
Accurate measurements of the nanoscale electromechanical coupling in
materials, including piezo and ferroelectrics, twisted 2D layers, and
biological systems is of both fundamental scientific and applied importance.
Piezoresponse Force Microscopy (PFM) is capable of detecting strains in these
materials, down to the picometer range. Following the emergence of weaker
materials, the smaller signals associated with them have revealed various
crosstalk challenges that have limited the accuracy of measurements. Previous
work demonstrated that the use of an interferometric displacement sensor (IDS)
positioned appropriately above the tip of the cantilever (x/L~1), where x is
the spot position and L is the cantilever length, has enabled sensitive and
artifact-free electromechanical measurements. A similar approach has been
employed in removing unwanted electrostatic and in-plane response contributions
for the optical beam deflection (OBD) measurement technique commonly used in
most atomic force microscopes. In the present study, extensive automated
sub-resonance spot position dependent PFM measurements were conducted on
periodically poled lithium niobate (PPLN). In this work, both IDS and OBD
responses were measured simultaneously, allowing direct comparisons of the two
approaches. The IDS showed a blind spot at x/L~1, as expected. However, for OBD
measurements, the blind spot's location exhibited wider variation, ranging from
0.15<x/L<0.61. Furthermore, the magnitudes of the amplitudes measured with IDS
and OBD were typically different, sometimes approaching disagreement by a
factor of two. These measurements have important implications, not only for the
PPLN measured here, but for more complex and unknown samples that have a
heterogeneous polarization and electrical characteristic.Comment: 40 pages, 16 Figures, 24 Supplemental Figure
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