156 research outputs found
Advanced multilateration theory, software development, and data processing: The MICRODOT system
The process of geometric parameter estimation to accuracies of one centimeter, i.e., multilateration, is defined and applications are listed. A brief functional explanation of the theory is presented. Next, various multilateration systems are described in order of increasing system complexity. Expected systems accuracy is discussed from a general point of view and a summary of the errors is listed. An outline of the design of a software processing system for multilateration, called MICRODOT, is presented next. The links of this software, which can be used for multilateration data simulations or operational data reduction, are examined on an individual basis. Functional flow diagrams are presented to aid in understanding the software capability. MICRODOT capability is described with respect to vehicle configurations, interstation coordinate reduction, geophysical parameter estimation, and orbit determination. Numerical results obtained from MICRODOT via data simulations are displayed both for hypothetical and real world vehicle/station configurations such as used in the GEOS-3 Project. These simulations show the inherent power of the multilateration procedure
A Method for Obtaining Cosmological Models Consistency Relations and Gaussian Processes Testing
In the present work, we apply consistency relation tests to several
cosmological models, including the flat and non-flat CDM models, as
well as the flat XCDM model. The analysis uses a non-parametric Gaussian
Processes method to reconstruct various cosmological quantities of interest,
such as the Hubble parameter and its derivatives from data, as
well as the comoving distance and its derivatives from SNe Ia data. We
construct consistency relations from these quantities which should be valid
only in the context of each model and test them with the current data. We were
able to find a general method of constructing such consistency relations in the
context of reconstruction. In the case of comoving distance
reconstruction, there were not a general method of constructing such relations
and this work had to write an specific consistency relation for each model.
From data, we have analyzed consistency relations for all the three
above mentioned models, while for SNe Ia data we have analyzed consistency
relations only for flat and non-flat CDM models. Concerning the flat
CDM model, some inconsistency was found, at more than c.l.,
with the data in the interval , while the
other models were all consistent at this c.l. Concerning the SNe Ia data, the
flat CDM model was consistent in the interval, at
c.l., while the nonflat CDM model was consistent in the same interval,
at 2 c.l.Comment: 17 pages and 7 figure
Analytical methods in wineries: is it time to change?
A review of the methods for the most common parameters determined in wine—namely, ethanol, sulfur dioxide, reducing sugars, polyphenols, organic acids, total and volatile acidity, iron, soluble solids, pH, and color—reported in the last 10 years is presented here. The definition of the given parameter, official and usual methods in wineries appear at the beginning of each section, followed by the methods reported in the last decade divided into discontinuous and continuous methods, the latter also are grouped in nonchromatographic and chromatographic methods because of the typical characteristics of each subgroup. A critical comparison between continuous and discontinuous methods for the given parameter ends each section. Tables summarizing the features of the methods and a conclusions section may help users to select the most appropriate method and also to know the state-of-the-art of analytical methods in this area
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