3,158 research outputs found
Frequency stabilization of an external-cavity diode laser
Using a hybrid optical/electronic technique, an external-cavity diode laser was frequency stabilized with respect to the sub-Doppler spectrum of cesium vapor. Laser linewidths of 65 kHz and frequency stabilities of ±10 kHz were obtained
Guided Tour of Pythonian Museum
At http:hdfeos.orgzoo, we have a large collection of Python examples of dealing with NASA HDF (Hierarchical Data Format) products. During this hands-on Python tutorial session, we'll present a few common hacks to access and visualize local NASA HDF data. We'll also cover how to access remote data served by OPeNDAP (Open-source Project for a Network Data Access Protocol). As a glue language, we will demonstrate how you can use Python for your data workflow - from searching data to analyzing data with machine learning
Data are from Mars, Tools are from Venus
Although during the data production phase, the data producers will usually ensure the products to be easily used by the specific power users the products serve. However, most data products are also posted for general public to use. It is not straightforward for data producers to anticipate what tools that these general end-data users are likely to use. In this talk, we will try to help fill in the gap by going over various tools related to Earth Science and how they work with the existing NASA HDF (Hierarchical Data Format) data products and the reasons why some products cannot be visualized or analyzed by existing tools. One goal is for to give insights for data producers on how to make their data product more interoperable. On the other hand, we also provide some hints for end users on how to make tools work with existing HDF data products. (tool category list: check the comments) HDF-EOS tools: HDFView HDF-EOS Plugin, HEG, h4tonccf, hdf-eos2 dumper, NCL, MATLAB, IDL, etc.net; CDF-Java tools: Panoply, IDV, toosUI, NcML, etc.net; CDF-C tools: ArcGIS Desktop, GrADS, NCL, NCO, etc.; GDAL tools: ArcGIS Desktop, QGIS, Google Earth, etc.; CSV tools: ArcGIS Online, MS Excel, Tableau, etc
A SUSY SO(10) GUT with an Intermediate Scale
We examine a superpotential for an SO(10) GUT and show that if the parameters
of the superpotential are in a certain region, the SO(10) GUT has an
intermediate symmetry which breaks down to the group of the
Standard Model at an intermediate scale GeV. In the model by the
breakdown of the symmetry right-handed neutrinos acquire mass of the
intermediate scale through a renormalizable Yukawa coupling.Comment: 36 pages, LaTeX, I fixed several mistakes as follows. 1. delete
Appendix D because there was a mistake and if I fix it, it becomes nothing
interesting. 2. matrix M(2,1,\pm 1/2) at the last half of the section 4 is
changed. COnsequent result is not essentially changed. 3. several typological
errors are fixe
Variation in the digestiility of amino acids in soybean meal from a single processing plant
Digestibilities of amino acids among samples of soybean meal (SBM) collected during a fall harvest season (4 collections made 15 d apart) were similar, except that true digestibility from tryptophan was lower for a sample collected on d 30 of the experiment
vs SMB samples collected on the other dates. Our data suggest that proximate components and amino acid digestibilities of the SBM were very consistent and uniform during the 45 d of sample collection in one processing plant
Electric Polarizability of Neutral Hadrons from Lattice QCD
By simulating a uniform electric field on a lattice and measuring the change
in the rest mass, we calculate the electric polarizability of neutral mesons
and baryons using the methods of quenched lattice QCD. Specifically, we measure
the electric polarizability coefficient from the quadratic response to the
electric field for 10 particles: the vector mesons and ; the
octet baryons n, , , , and ;
and the decouplet baryons , , and .
Independent calculations using two fermion actions were done for consistency
and comparison purposes. One calculation uses Wilson fermions with a lattice
spacing of fm. The other uses tadpole improved L\"usher-Weiss gauge
fields and clover quark action with a lattice spacing fm. Our results
for neutron electric polarizability are compared to experiment.Comment: 25 pages, 20 figure
Reversing conditional orderings
We analyze some specific aspects concerning conditional orderings and relations among them. To this purpose we define a suitable concept of reversed conditional ordering and prove some related results. In particular we aim to compare the univariate stochastic orderings ≤ st, ≤ hr, and ≤ lr in terms of differences among different notions of conditional orderings. Some applications of our result to the analysis of positive dependence will be detailed. We concentrate attention to the case of a pair of scalar random variables X, Y . Suitable extensions to multivariate cases are possible
Artificial Rydberg Atom
We analyze bound states of an electron in the field of a positively charged
nanoshell. We find that the binding and excitation energies of the system
decrease when the radius of the nanoshell increases. We also show that the
ground and the first excited states of this system have remarkably the same
properties of the highly excited Rydberg states of a hydrogen-like atom i.e. a
high sensitivity to the external perturbations and long radiative lifetimes.Comment: 16 page
Basic Terra fusion product algorithm theoretical basis and data specifications
The basic Terra fusion product provides general atmospheric and surface research community a unique temporally-fused set of radiance measurements from all the Terra instruments, namely, the Moderate-resolution Imaging Spectroradiometer (MODIS), the Multi-angle Imaging SpectroRadiometer (MISR), the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), the Clouds and Earth’s Radiant Energy System (CERES), and the Measurements of Pollution in the Troposphere (MOPITT). This product contains (1) radiance values of IOFVs (pixels) for each spectral band at a native resolution for each instrument, (2) their quality flags associated with radiance values, (3) their latitude and longitude information at a native resolution, (4) time of observations, (5) instrument viewing geometry, and (6) solar position.NASA ACCESS program under contract NNX16AMO7AThis research is part of the Blue Waters sustained-petascale computing project, which is supported by the National Science Foundation (awards OCI-0725070 and ACI-1238993) and the state of Illinois. Blue Waters is a joint effort of the University of Illinois at Urbana-Champaign and its National Center for Supercomputing Applications.The computations for this research also used the NSF-supported ROGER (Resourcing Open Geospatial Education and Research) cyberGIS supercomputer (Award#: 1429699).Ope
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