The application of inverse VLBI measurement in Mars orientation parameter solutions

Icarus ◽  
2021 ◽  
pp. 114662
Author(s):  
Jianguo Yan ◽  
Bo Wang ◽  
Xuan Yang ◽  
Mao Ye ◽  
Wutong Gao ◽  
...  
Keyword(s):  
Orientation Parameter

Earth Orientation Parameter Analysis from VLBI Data

1998 ◽  
pp. 318-324
Author(s):  
V. Thorandt ◽  
A. Reinhold ◽  
D. Ullrich ◽  
J. Ihde ◽  
J. Campbell ◽  
...  
Keyword(s):  
Parameter Analysis ◽  
Orientation Parameter ◽  
Earth Orientation Parameter ◽  
Earth Orientation ◽  
Vlbi Data

A new method for Rietveld clay analysis. Part I. Use of a universal measured standard profile for Rietveld quantification of montmorillonites

1994 ◽  
Vol 9 (2) ◽  
pp. 119-123 ◽  
Author(s):  
J. C. Taylor ◽  
C. E. Matulis
Keyword(s):  
Quantitative Analysis ◽  
Chemical Treatment ◽  
Rietveld Analysis ◽  
Preferred Orientation ◽  
New Method ◽  
Orientation Parameter ◽  
Xrd Pattern ◽  
Full Profile ◽  
Analysis System ◽  
Standard Profile

A new method for the quantification of montmorillonite by full-profile Rietveld analysis of the XRD profile is presented. A measured standard XRD pattern of Algerian bentonite was used to construct a universally applicable montmorillonite (hkl) file for use with a P.C. based Rietveld XRD quantitative analysis system, SIROQUANT. “Universal” means that the standard file can be used for montmorillonites from other localities. The validity of the montmorillonite standard profile was tested with weighed mixtures of quartz and different standard montmorillonites. The results show the montmorillonite observed (hkl) file is generally applicable (i.e., universal), and can be used to quantify montmorillonite in any mineral without modification or chemical treatment of the sample. Two halfwidth functions were used for the montmorillonite, corresponding to the sharp (hk0) and broad (hkl) classes of reflections. A March preferred orientation parameter for montmorillonite was also refined.

Orientation Parameter

2016 ◽  
Author(s):  
Richard G. Jones ◽  
Christopher K. Ober ◽  
Philip Hodge ◽  
Pavel Kratochvíl ◽  
Graeme Moad ◽  
...  
Keyword(s):  
Orientation Parameter

scholarly journals Effect of Shear Rate on the Orientation and Relaxation of a Vanillic Acid Based Liquid Crystalline Polymer

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 935 ◽  
Author(s):  
Gijs de Kort ◽  
Nils Leoné ◽  
Eric Stellamanns ◽  
Dietmar Auhl ◽  
Carolus Wilsens ◽  
...  
Keyword(s):  
Shear Stress ◽  
Liquid Crystal ◽  
Shear Rate ◽  
Liquid Crystalline ◽  
Morphological Changes ◽  
Crystalline Polymer ◽  
Elastic Response ◽  
Orientation Parameter ◽  
X Ray ◽  
Break Up

In this study, we report on the visco-elastic response during start-up and cessation of shear of a novel bio-based liquid crystal polymer. The ensuing morphological changes are analyzed at different length scales by in-situ polarized optical microscopy and wide-angle X-ray diffraction. Upon inception of shear, the polydomain texture is initially stretched, at larger strain break up processes become increasingly important, and eventually a steady state texture is obtained. The shear stress response showed good coherence between optical and rheo-X-ray data. The evolution of the orientation parameter coincides with the evolution of the texture: the order parameter increases as the texture stretches, drops slightly in the break up regime, and reaches a constant value in the plateau regime. The relaxation of the shear stress and the polydomain texture showed two distinct processes with different timescales: The first is fast contraction of the stretched domain texture; the second is the slow coalescence of the polydomain texture. The timescale of the orientation parameter’s relaxation matched with that of the slow coalescence process. All processes were found to scale with shear rate in the tested regime. These observations can have far reaching implications for the processing of liquid crystal polymers as they indicate that increased shear rates during processing can correspond to an increased relaxation rate of the orientation parameter and, therefore, a decrease in anisotropy and material properties after cooling.

scholarly journals In-flight Correction of the Satellite Orientation Parameter during Target Mode

2019 ◽  
Vol 6 (2) ◽  
pp. 249-262
Author(s):  
Amr Ali ◽  
Moutaz Hegaze ◽  
Ahmed Elrodesly
Keyword(s):  
Orientation Parameter ◽  
Target Mode

scholarly journals SELECTION EFFECTS AND STRUCTURAL SYMMETRIES IN THE ORIENTATION BASED UNIFIED SCHEME

2019 ◽  
Vol 55 (1) ◽  
pp. 105-116
Author(s):  
C. C. Onuchukwu ◽  
A. A. Ubachukwu
Keyword(s):  
Linear Size ◽  
Radio Sources ◽  
Selection Effects ◽  
Orientation Parameter ◽  
Regression Analyses ◽  
Asymmetry Parameters ◽  
Q Values

Using the projected linear size, (D) as an orientation parameter, the armlength ratio, (Q) and the lobe-luminosity ratio, (R) as asymmetry parameters, we test the FR-II galaxies (Gs) and radio-loud quasar (Qs) unification scheme. Using the median values of our binned sample, our results, generally indicate that the D of the radio sources are smaller at higher redshifts z and at larger Q values, with the D of Qs smaller than those of Gs across all Q, z and R bins. Also, the D of Gs appear smaller for lower values of Q, if R ≤ 1.0 but become larger at higher values of Q if R > 1.0. For Qs, the D decreases with increasing Q, R and z. These results imply that the beaming effect is more important in Qs than in Gs. The D − R regression analyses for different Q and z subsamples suggest the importance of factors other than beaming and orientation in the interpretation of the evolution of these radio sources.

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