Measured distribution of the duration of fades at 1.8 GHz

2006 ◽  
Author(s):  
Antonio M O Ribeiro ◽  
Claudio Selmi Castelli ◽  
Evandro Conforti
Keyword(s):  
Measured Distribution

scholarly journals Solvent Extraction Equilibrium in the CuSO4–H2SO4–LIX 984–ESCAID 103 Systern

1999 ◽  
Vol 23 (8) ◽  
pp. 518-519
Author(s):  
Francisco Jose Alguacil ◽  
Jaime Simpson ◽  
Patricio Navarro
Keyword(s):  
Solvent Extraction ◽  
Thermodynamic Model ◽  
Distribution Coefficients ◽  
Extraction System ◽  
Extraction Equilibrium ◽  
Solvent Extraction System ◽  
Measured Distribution

A previously determined thermodynamic model for extraction equilibrium is used as a basis to predict experimentally measured distribution coefficients for the CuSO4–H2SO4–LIX 984–Escaid 103 solvent extraction system at 25 °C and aqueous copper concentrations in the range 0.01–2.0 gL−1, the copper loading isotherm is also obtained.

Synthesis, Ultrapurification and Analysis of LaF3 for Fluoride Optical Fibers

1986 ◽  
Vol 88 ◽  
Author(s):  
D. R. Gabbe ◽  
R. C. Folweiler ◽  
F. X. Pink
Keyword(s):  
Neutron Activation Analysis ◽  
Optical Fibers ◽  
Ionic Radius ◽  
Concentration Profiles ◽  
Zone Refining ◽  
Impurity Segregation ◽  
A Value ◽  
Coefficient Versus ◽  
Rare Earth Impurities ◽  
Measured Distribution

ABSTRACTLanthanum chloride was synthesized by reacting La2O3 with CCl4. Purification carried out by zone refining resulted in reduction of Nd and Eu concentrations by at least a factor of 103. Impurity segregation coefficients were calculated from the concentration profiles in the charge measured by neutron activation analysis. Values of 0.85, 0.5, and 0.15 were found for Ce, Nd and Eu while a value of 0.65 was obtained for Pr from a plot of measured distribution coefficient versus ionic radius. These results show the feasibility of removing rare earth impurities to the ppb level from LaCl3. After purification, LaC13 is converted to LaF3

Chronic Pulmonary Disease in Neonates After Artificial Ventilation: Distribution of Ventilation and Pulmonary Interstitial Emphysema

PEDIATRICS ◽  
1977 ◽  
Vol 60 (3) ◽  
pp. 273-281
Author(s):  
John L. Watts ◽  
Ronald L. Ariagno ◽  
June P. Brady
Keyword(s):  
Ductus Arteriosus ◽  
Ventilation Distribution ◽  
Pulmonary Interstitial Emphysema ◽  
Interstitial Emphysema ◽  
Nitrogen Washout ◽  
Significant Difference ◽  
Group A ◽  
Group B ◽  
Inspired Oxygen ◽  
Measured Distribution

To determine pulmonary function abnormalities in patients with neonatal bronchopulmonary dysplasia (BPD), we measured distribution of ventilation by nitrogen washout, minute and tidal volume, and arterial and alveolar gases in three groups of ten preterm infants with similar birth weights (mean = 1,340 g) and gestational ages (mean = 30.3 weeks). Infants in group A were never artificially ventilated, those in group B were ventilated but had no subsequent BPD, and those in group C were ventilated and developed BPD. Infants with BPD had severe maldistribution of ventilation (pulmonary clearance delay 223% versus 47% and 60% for groups A and B). They had decreased tidal volumes (5.3 ml versus 7.0 and 6.2 ml) and higher respiratory rates (60/min versus 47 and 48) but similar minute volumes. They also had increased Paco2 (53.6 torr versus 41.9 and 43.4 torr) and increased arterial-alveolar carbon dioxide gradients (6.8 torr versus 3.1 and 1.8 torr). There was no statistically significant difference between groups B and C for the time spent in fractional inspired oxygen > 0.40 and > 0.60, or the time ventilated or intubated, or the incidence of patent ductus arteriosus. Early pulmonary interstitial emphysema was much more common in the infants who subsequently developed BPD (eight of ten versus two of ten, P < .01).

Fluid flow in regions bounded by porous surfaces

1956 ◽  
Vol 234 (1199) ◽  
pp. 456-475 ◽  
Keyword(s):  
Integral Equation ◽  
Porous Surface ◽  
Experimental Conditions ◽  
Porous Tube ◽  
Physical Conditions ◽  
Striking Result ◽  
Through Flow ◽  
Porous Surfaces ◽  
Flow Through ◽  
Measured Distribution

The aerodynamic effects of sucking away boundary layers or blowing air into them through a porous surface have been studied on the assumption that the rate of discharge through the pores is under the control of the experimenter. When all the fluid reaches the field of flow through the pores the pressure at any point in the field depends on the distribution over the porous surface of the flow through it, and the through-flow at any point of it depends on the pressure there. To describe flow of this kind mathematically is difficult and no case seems to have been discussed before. In § 1 a particular case, that of flow through a wedge, cylinder or cone made of a material the resistance of which is proportional to the square of the velocity through it, is treated by means of an integral equation. This equation is solved and the results reduced to a form which lends itself to experimental verification. In § 2 experiments are described in which the physical conditions assumed in the analysis were very nearly attained and the theoretical conclusions then verified. The most striking result was the agreement, to within 1%, between the calculated and the measured discharge of water from a tank through an internal porous tube whose base was an orifice in the bottom. The measured distribution of velocity in the plane of the orifice also agreed with the calculations. Experiments with porous cones also yielded results agreeing with theory when the correct experimental conditions could be satisfied.

Improvement of observability in poorly measured distribution networks

2014 ◽  
Author(s):  
Cristian Bovo ◽  
Valentin Ilea ◽  
Milos Subasic ◽  
Fabio Zanellini ◽  
Cario Arigoni ◽  
...  
Keyword(s):  
Distribution Networks ◽  
Measured Distribution

scholarly journals Measured distribution of cloud chamber tracks from radioactive decay: a new empirical approach to investigating the quantum measurement problem

2021 ◽  
Author(s):  
Jonathan Schonfeld
Keyword(s):  
Spatial Distribution ◽  
Quantum Mechanics ◽  
Quantum Measurement ◽  
Measurement Problem ◽  
Radioactive Decay ◽  
Foundations Of Quantum Mechanics ◽  
Radioactive Source ◽  
Cloud Chamber ◽  
Quantum Measurement Problem ◽  
Measured Distribution

Abstract Using publically available video of a cloud chamber with a very small radioactive source, I measure the spatial distribution of where tracks start, and consider possible implications. This is directly relevant to the quantum measurement problem and its possible resolution, and appears never to have been done before. The raw data are relatively uncontrolled, leading to caveats that should guide future, more tailored experiments. Track distributions from decays in cloud chambers represent a previously unappreciated way to probe the foundations of quantum mechanics, and a novel case of wavefunctions with macroscopic signatures.

scholarly journals Statistical characteristics of surrogate data based on geophysical measurements

2006 ◽  
Vol 13 (4) ◽  
pp. 449-466 ◽  
Author(s):  
V. Venema ◽  
S. Bachner ◽  
H. W. Rust ◽  
C. Simmer
Keyword(s):  
Time Series ◽  
Power Spectrum ◽  
Surrogate Data ◽  
Structure Functions ◽  
Statistical Characteristics ◽  
Historical Time ◽  
Nonlinear Dynamical ◽  
Small Scales ◽  
Measured Distribution ◽  
Geophysical Measurements

Abstract. In this study, the statistical properties of a range of measurements are compared with those of their surrogate time series. Seven different records are studied, amongst others, historical time series of mean daily temperature, daily rain sums and runoff from two rivers, and cloud measurements. Seven different algorithms are used to generate the surrogate time series. The best-known method is the iterative amplitude adjusted Fourier transform (IAAFT) algorithm, which is able to reproduce the measured distribution as well as the power spectrum. Using this setup, the measurements and their surrogates are compared with respect to their power spectrum, increment distribution, structure functions, annual percentiles and return values. It is found that the surrogates that reproduce the power spectrum and the distribution of the measurements are able to closely match the increment distributions and the structure functions of the measurements, but this often does not hold for surrogates that only mimic the power spectrum of the measurement. However, even the best performing surrogates do not have asymmetric increment distributions, i.e., they cannot reproduce nonlinear dynamical processes that are asymmetric in time. Furthermore, we have found deviations of the structure functions on small scales.

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