Parametrization of the cosmological scale factor

1994 ◽  
Vol 33 (10) ◽  
pp. 2099-2117 ◽  
Author(s):  
Renee R. Wahba ◽  
Larry L. Smalley ◽  
Alphonsus J. Fennelly
Keyword(s):  
Scale Factor ◽  
Cosmological Scale

scholarly journals VARIABLE CHAPLYGIN GAS: CONSTRAINTS FROM CMBR ANDSNe Ia

2006 ◽  
Vol 15 (07) ◽  
pp. 1089-1098 ◽  
Author(s):  
GEETANJALI SETHI ◽  
SUSHIL K. SINGH ◽  
PRANAV KUMAR ◽  
DEEPAK JAIN ◽  
ABHA DEV
Keyword(s):  
Equation Of State ◽  
Positive Function ◽  
Chaplygin Gas ◽  
Scale Factor ◽  
Type Ia Supernovae ◽  
Data Set ◽  
Cosmological Scale ◽  
Type Ia ◽  
Ia Supernovae

We constrain the parameters of the variable Chaplygin gas model, using the location of peaks of the CMBR spectrum and the SNe Ia "gold" data set. The equation of state of the model is P = -A(a)/ρ, where A(a) = A0a-nis a positive function of the cosmological scale factor a, A0and n> being constants. The variable Chaplygin gas interpolates from the dust-dominated era to the quintessence dominated era. The model is found to be compatible with current type Ia supernovae data and the location of the first peak if the values of Ωmand n lie in the interval [0.017, 0.117] and [-1.3, 2.6], respectively.

The Basic Empathy Scale: Factor structure and validity in a sample of inpatient adolescents.

2019 ◽  
Vol 31 (10) ◽  
pp. 1208-1219 ◽  
Author(s):  
Veronica McLaren ◽  
Salome Vanwoerden ◽  
Carla Sharp
Keyword(s):  
Factor Structure ◽  
Scale Factor ◽  
Empathy Scale ◽  
Basic Empathy Scale

Ultra Short Baseline (USBL) Calibration for Positioning of Underwater Objects

2019 ◽  
Vol 2 (2) ◽  
pp. 73-85
Author(s):  
Bagus Septyanto ◽  
Dian Nurdiana ◽  
Sitti Ahmiatri Saptari
Keyword(s):  
Acoustic Wave ◽  
Scale Factor ◽  
Positioning System ◽  
Radio Waves ◽  
Short Baseline ◽  
Error Angle ◽  
Satellite Navigation System ◽  
The Earth ◽  
Underwater Positioning ◽  
Radio Signals

In general, surface positioning using a global satellite navigation system (GNSS). Many satellites transmit radio signals to the surface of the earth and it was detected by receiver sensors into a function of position and time. Radio waves really bad when spreading in water. So, the underwater positioning uses acoustic wave. One type of underwater positioning is USBL. USBL is a positioning system based on measuring the distance and angle. Based on distance and angle, the position of the target in cartesian coordinates can be calculated. In practice, the effect of ship movement is one of the factors that determine the accuracy of the USBL system. Ship movements like a pitch, roll, and orientation that are not defined by the receiver could changes the position of the target in X, Y and Z coordinates. USBL calibration is performed to detect an error angle. USBL calibration is done by two methods. In USBL calibration Single Position obtained orientation correction value is 1.13 ̊ and a scale factor is 0.99025. For USBL Quadrant calibration, pitch correction values is -1.05, Roll -0.02 ̊, Orientation 6.82 ̊ and scale factor 0.9934 are obtained. The quadrant calibration results deccrease the level of error position to 0.276 - 0.289m at a depth of 89m and 0.432m - 0.644m at a depth of 76m

Development of Quality Early Childhood Care and Education (QECCE) Scale: Factor Structural and Psychometric Properties

2019 ◽  
Vol 18 (11) ◽  
pp. 385-396
Author(s):  
Wong Kung-Teck ◽  
Jamilah Omar ◽  
Sopia Md Yassin ◽  
Mazlina Che Mustafa ◽  
Norazilawati Abdullah ◽  
...  
Keyword(s):  
Early Childhood ◽  
Psychometric Properties ◽  
Scale Factor ◽  
Early Childhood Care ◽  
Childhood Care
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