scholarly journals Resonance Parameters for Uranium 233

1967 ◽  
Vol 20 (6) ◽  
pp. 617 ◽  
Author(s):  
AR de L Musgrove
Keyword(s):  
Least Squares ◽  
Cross Sections ◽  
Least Squares Method ◽  
The Other ◽  
Resonance Parameters ◽  
Single Level ◽  
Channel Theory ◽  
Good Agreement

Single-level and multilevel resonance parameters are given for 233U below 11 e V_ The total and fission cross sections were fitted simultaneously and good agreement was obtained. Spin assignments determined by the least squares method support the prediction of the channel theory of fission that 233U has two level populations; one with predominantly large fission widths and the other with much narrower widths.

L X-ray fluorescence cross sections in the atomic region 59 ≤ Z ≤ 82 excited by 16.58 keV photons

1996 ◽  
Vol 74 (5-6) ◽  
pp. 230-235 ◽  
Author(s):  
D. V. Rao ◽  
R. Cesareo ◽  
G. E. Gigante
Keyword(s):  
Excitation Energy ◽  
Least Squares ◽  
Cross Sections ◽  
Experimental Results ◽  
X Ray ◽  
Experimental Cross ◽  
Average Fluorescence ◽  
Good Agreement

LL, Lα, Lβ, and Lγ X-ray fluorescence cross sections for Pr, Sm, Gd, Dy, Ho, Er, Yb, Pt Au, and Pb were measured at the excitation energy 16.58 keV. An X-ray tube and a secondary excitor system was used instead of radioisotopes for the measurements. Experimental cross sections are compared with the theoretical estimates based on relativistic Dirac–Hartree–Slater theory. Average L-shell fluorescence yields [Formula: see text] are deduced using the present experimental cross sections and the theoretical subshell photoionization cross sections. The derived average fluorescence yields are fitted by least squares to polynomials in Z of the form ΣnanZn and compared with theoretical and earlier fitted values. Good agreement is observed ' between the experimental results and the theoretical estimates based on relativistic Dirac–Hartree–Slater theory.

scholarly journals THE MEASUREMENT OF INCIDENT AND REFLECTED SPECTRA USING A LEAST SQUARES METHOD

1980 ◽  
Vol 1 (17) ◽  
pp. 8 ◽  
Author(s):  
E.P.D. Mansard ◽  
E.R. Funke
Keyword(s):  
Wave Propagation ◽  
Least Squares ◽  
Simultaneous Measurement ◽  
Least Squares Method ◽  
Experimental Investigations ◽  
Side Channel ◽  
Line Parallel ◽  
The Waves ◽  
Good Agreement

A least squares method to separate the incident and reflected spectra from the measured co-existing spectra is presented. This method requires a simultaneous measurement of the waves at three positions in the flume which are in reasonable proximity to each other and are on a line parallel to the direction of wave propagation. Experimental investigations have shown that there is good agreement between the incident spectra calculated by the least squares method and the incident spectra measured concurrently in a side channel.

scholarly journals SPATIALLY-AVERAGED DIFFUSIVITIES FOR POLLUTANT TRANSPORT IN VEGETATED FLOWS

2016 ◽  
Vol 42 ◽  
pp. 1660170
Author(s):  
JUN HUANG ◽  
XIAOFENG ZHANG ◽  
VIVIEN P. CHUA
Keyword(s):  
Experimental Data ◽  
Least Squares ◽  
Cross Sections ◽  
Least Squares Method ◽  
Pollutant Transport ◽  
Longitudinal Direction ◽  
Environmental Benefits ◽  
Reliable Estimate ◽  
Injection Point ◽  
Shoreline Stabilization

Vegetation in wetlands can create complicated flow patterns and may provide many environmental benefits including water purification, flood protection and shoreline stabilization. The interaction between vegetation and flow has significant impacts on the transport of pollutants, nutrients and sediments. In this paper, we investigate pollutant transport in vegetated flows using the Delft3D-FLOW hydrodynamic software. The model simulates the transport of pollutants with the continuous release of a passive tracer at mid-depth and mid-width in the region where the flow is fully developed. The theoretical Gaussian plume profile is fitted to experimental data, and the lateral and vertical diffusivities are computed using the least squares method. In previous tracer studies conducted in the laboratory, the measurements were obtained at a single cross-section as experimental data is typically collected at one location. These diffusivities are then used to represent spatially-averaged values. With the numerical model, sensitivity analysis of lateral and vertical diffusivities along the longitudinal direction was performed at 8 cross-sections. Our results show that the lateral and vertical diffusivities increase with longitudinal distance from the injection point, due to the larger size of the dye cloud further downstream. A new method is proposed to compute diffusivities using a global minimum least squares method, which provides a more reliable estimate than the values obtained using the conventional method.

THE INFLUENCE OF THE WORKING FACTOR AND CELL CONTENT ON THE PRECISION OF MICROSCOPIC COUNTS OF MILK SOMATIC CELLS1

1966 ◽  
Vol 29 (2) ◽  
pp. 49-52 ◽  
Author(s):  
R. Schneider ◽  
D. E. Jasper
Keyword(s):  
Least Squares ◽  
Cell Count ◽  
Inverse Relationship ◽  
Least Squares Method ◽  
The Other ◽  
Major Portion ◽  
Cell Content ◽  
Cell Counts ◽  
Count Range ◽  
The Relationship

Summary Variations in precision of the Breed method for cell counts in milk were investigated by utilizing different working factors (WF) for the same smear and by using the same WF over a major portion of the probable cell count range. A significant inverse relationship was found between precision and the WF. With a constant WF on the other hand, the precision of the count increased very significantly as the actual cell count increased. Formulas showing the relationship between the expected high and low for any given cell count were computed via the least squares method for a WF of 20,000. Evidence was presented that a WF of 5,000 or below would be necessary when a good estimate of cell content is important.

scholarly journals Associations between Circulating Lipids and Fat-Soluble Vitamins and Carotenoids in Healthy Overweight and Obese Men

2020 ◽  
Vol 4 (6) ◽  
Author(s):  
Jennifer M Kelly ◽  
Gregory Matuszek ◽  
Tim J van den Broek ◽  
Gordon S Huggins ◽  
Caren E Smith ◽  
...  
Keyword(s):  
Least Squares ◽  
Lipid Class ◽  
Partial Least Squares ◽  
Least Squares Method ◽  
Interindividual Variability ◽  
The Other ◽  
Healthy Men ◽  
Circulating Markers ◽  
Fat Soluble Vitamins ◽  
Partial Least Squares Method

ABSTRACT Inconsistent associations between lipids and circulating markers of fat-soluble vitamin and carotenoid status have been reported. The aim of this hypothesis-generating study was to examine the contribution of the LC-MS-based lipidome, characterized by lipid class, carbon count, and the number of unsaturated bonds, to the interindividual variability in circulating concentrations of retinol, carotenoids, 25-hydroxyvitamin D3, α-tocopherol, γ-tocopherol, and phylloquinone in 35 overweight and obese, but healthy men. A sparse partial least-squares method was used to accomplish this aim. Highly abundant phospholipids and triglycerides (TGs) contributed to the interindividual variability in phylloquinone, α-tocopherol, and γ-tocopherol. Interindividual variability in lycopene concentrations was driven by concentrations of low-abundant TG. 25-Hydroxyvitamin D3, retinol, and the other carotenoids were not influenced by lipids. Except for lycopene, evaluation of lipids beyond class does not appear to further explain the interindividual variability in circulating concentrations of fat-soluble vitamins and carotenoids.

scholarly journals How to draw the line in biomedical research

eLife ◽  
2013 ◽  
Vol 2 ◽  
Author(s):  
Lisa Huang ◽  
Amir Rattner ◽  
Han Liu ◽  
Jeremy Nathans
Keyword(s):  
Least Squares ◽  
Biomedical Research ◽  
Least Squares Method ◽  
The Other ◽  
Two Dimensional ◽  
Scatter Plot ◽  
Best Fitting ◽  
The Relationship

The use of the least squares method to calculate the best-fitting line through a two-dimensional scatter plot typically requires the user to assume that one of the variables depends on the other. However, in many cases the relationship between the two variables is more complex, and it is not valid to say that one variable is independent and the other is dependent. When analysing such data researchers should consider plotting the three regression lines that can be calculated for any two-dimensional scatter plot.

scholarly journals New function for representing IEC 61000-4-2 standard electrostatic discharge current

2014 ◽  
Vol 27 (4) ◽  
pp. 509-520 ◽  
Author(s):  
Vesna Javor
Keyword(s):  
Least Squares ◽  
Discharge Current ◽  
Least Squares Method ◽  
Electrostatic Discharge ◽  
First Derivative ◽  
Good Agreement

New function for representing electrostatic discharge (ESD) currents according to the IEC 61000-4-2 Standard current is proposed in this paper. Good agreement with the Standard defined parameters is obtained. This function is compared to other functions from literature. Its first derivative needed for field calculations is analyzed in the paper. Main advantages are simplified choice of parameters, possibility to obtain discontinuities in the decaying part, and zero value of the function first derivative at t=0+. Parameters of the function are obtained by using Least-squares method (LSQM).

Atomanordnung und Strukturverfeinerung von Cancrinit

1965 ◽  
Vol 122 (1-6) ◽  
pp. 407-422
Author(s):  
O. Jarchow
Keyword(s):  
Crystal Structure ◽  
Least Squares ◽  
Least Squares Method ◽  
Three Dimensional ◽  
The Other ◽  
Threefold Axis ◽  
Space Group ◽  
X Ray

Abstract X-ray photographe of (Ca, Na)CO3 cancrinites show diffuse satellites with the indices (h k l ± 3/7), The examined crystals from Litchfield, U.S.A., have the space group P63 and the lattice dimensions a = 12.75 Å and c = 5.14 Å. The crystal structure has been determined-independently of all previous structure assumptions-from the relation of the transformation hauyn-canorinite and refined on three-dimensional data by the least-squares method to R = 0.089. The structure is composed of an ordered Si, Al framework with channels around the threefold axis and the axis 63; the other cations and anions as Na, Ca, H2O, CO3 etc. are enclosed in these channels.

Effects of level density in the cross sections of (α, xn), (α, pxn), (α, 2pxn) and (α, αxn) reactions in 197Au, 181Ta, natIn and 93Nb and pre-equilibrium analysis

2009 ◽  
Vol 87 (9) ◽  
pp. 1037-1046 ◽  
Author(s):  
N. L. Singh ◽  
S. Mukherjee
Keyword(s):  
Monte Carlo Simulation ◽  
Cross Sections ◽  
Neutron Emission ◽  
Level Density ◽  
The Other ◽  
Equilibrium Analysis ◽  
Simulation Code ◽  
Semiclassical Model ◽  
Γ Ray ◽  
Good Agreement

Excitation functions are measured for α-particle-induced reactions on 197Au, 181Ta, natIn, and 93Nb in the energy region 18 to 60 MeV using the activation method and γ-ray spectrometry. The experimental results are compared with semiclassical model codes, STAPRE, ALICE-91, and COMPLET. These models take into account compound nuclei as well as pre-equilibrium emissions. The angular momentum removal effects have also been included in the COMPLET code. The Monte Carlo simulation code PACE4 is also employed for the calculations of equilibrium cross sections. In the case of neutron emission channels, both the model codes give fairly good agreement. The COMPLET code on the other hand, explains the α-particle emission channels in a more convincing manner.

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