scholarly journals EXPERIMENTAL PROFILE MODELLIl NG OF METABOLISM

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Youcef Derbal
Keyword(s):  
Experimental Profile

A Chromosomal Region Promoting Outcrossing in a Conifer

Genetics ◽  
2001 ◽  
Vol 159 (3) ◽  
pp. 1283-1289
Author(s):  
Claire G Williams ◽  
Yi Zhou ◽  
Sarah E Hall
Keyword(s):  
Linkage Group ◽  
Chromosomal Region ◽  
Expressed Sequence Tag ◽  
Balancing Selection ◽  
Lethal Factor ◽  
Genetic Mechanism ◽  
Heterozygote Advantage ◽  
Experimental Profile ◽  
Gametic Selection ◽  
Pinus Taeda L

Abstract Prefertilization mechanisms influencing selfing rates are thought to be absent in conifers. Outcrossing in conifers is promoted via an embryo-lethal system, but the genetic mechanism is poorly understood. This study is the first experimental profile of the genetic mechanism promoting outcrossing in conifers. Molecular dissection of a Pinus taeda L. selfed pedigree detected a chromosomal region identified as PtTX3020-RPtest9. Within this region, a semilethal factor was tightly linked (r = 0.0076) to a polymorphic expressed sequence tag (EST). The linkage group flanking the lethal factor showed strong heterozygote advantage. Using genotypic frequencies for the linkage group, three hypotheses about the semilethal factor could be tested: (1) the presence of a balanced lethal system, i.e., a lethal factor present in each of the two marker intervals; (2) gametic selection operative prior to fertilization; and (3) a stage-specific lethal factor. Selection acted via the embryo-lethal system. No support for a genetic mechanism operating prior to fertilization was found. The semilethal factor exerted no effect after embryo maturity. The genetic mechanism promoting outcrossing in P. taeda L. appears to have a balancing selection system due to either pseudo-overdominance or true overdominance.

X-Ray Diffraction Profile Analysis of Powdered Samples

1989 ◽  
Vol 4 (2) ◽  
pp. 70-73 ◽  
Author(s):  
G.J. Stanisz ◽  
J.M. Holender ◽  
J. Sołtys
Keyword(s):  
Powder Diffraction ◽  
Profile Analysis ◽  
Quantitative Phase Analysis ◽  
X Ray Diffraction ◽  
Diffraction Profile ◽  
X Ray ◽  
Experimental Profile ◽  
Analytical Functions ◽  
Numerical Studies ◽  
Diffraction Patterns

AbstractA quantitative phase analysis often requires advanced numerical studies to determine the appropriate intensity values. In this paper the method of fitting analytical functions to the experimental profile is applied to X-ray powder diffraction patterns obtained with FeK radiation. In the present work, the authors examine some problems connected with numerical studies, especially the function describing the experimental profile. The usefulness of the α2 elimination procedure and the angular dependence FWHM are also examined.

Experimental profile evolution of a high-density field-reversed configuration

2006 ◽  
Vol 13 (12) ◽  
pp. 122505 ◽  
Author(s):  
E. L. Ruden ◽  
Shouyin Zhang ◽  
T. P. Intrator ◽  
G. A. Wurden
Keyword(s):  
Density Field ◽  
High Density ◽  
Field Reversed Configuration ◽  
Experimental Profile

Experimental and Numerical Analysis of Residual Stress in Cast Aluminum Alloy after FSP Process

2015 ◽  
Vol 651-653 ◽  
pp. 1563-1568 ◽  
Author(s):  
Marek Stanisław Węglowski ◽  
Piotr Sedek ◽  
Carter Hamilton
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Process Zone ◽  
Cast Aluminum Alloy ◽  
Stress Profile ◽  
Cast Aluminum ◽  
Tensile Stresses ◽  
Residual Stress Profile ◽  
Experimental Profile ◽  
Experimental Values

The effect of FSP modification of cast aluminum alloy AlSi9Mg on residual stress are presented. The numerical results are compared with the residual stresses experimentally measured by the trepanation method. Experimental results show that the residual tensile stresses are higher on the advancing side than on the retreating side. The simulation successfully captures the asymmetric behavior of the residual stress profile, and the predicted maximum residual stress values show relatively good agreement with the experimental values. The simulated profile, however, is more narrow than the experimental profile, yielding a smaller region of residual tensile stresses around the process zone than experimentally observed

The Oxidation of a Monophase Co-8.03 Wt% Cu Alloy at 700 to 1000 C

CORROSION ◽  
1981 ◽  
Vol 37 (11) ◽  
pp. 638-644 ◽  
Author(s):  
F. Viani ◽  
F. Gesmundo
Keyword(s):  
Rate Constant ◽  
Defect Structure ◽  
Copper Alloy ◽  
Copper Ions ◽  
Suitable Model ◽  
Detailed Calculation ◽  
Pure Cobalt ◽  
Copper Addition ◽  
Experimental Profile ◽  
Cu Alloy

Abstract The oxidation of a monophase cobalt-copper alloy at high temperature has been Studied to examine the effect of the copper addition to cobalt on the oxidation kinetics as well as on the scale morphology and composition. The rate law remains parabolic as for pure cobalt but the rate constant is higher at all temperatures. This result is interpreted as being due mainly to the doping of CoO by monovalent copper ions by means of a detailed calculation of the rate constant for the alloy making use of the experimental profile of the copper concentration in the scale and of a suitable model for the defect structure of cobalt oxide.

New analysis of the density effects observed on the rotational line profile of induced spectra of H2 and D2 dissolved in argon

1983 ◽  
Vol 61 (2) ◽  
pp. 156-163 ◽  
Author(s):  
U. Buontempo ◽  
P. Codastefano ◽  
S. Cunsolo ◽  
P. Dore ◽  
P. Maselli
Keyword(s):  
Dipole Moment ◽  
Absorption Spectra ◽  
Autocorrelation Function ◽  
Line Profile ◽  
Characteristic Time ◽  
Spectral Lines ◽  
Rotational Line ◽  
Density Effects ◽  
Experimental Profile ◽  
Induced Dipole

The induced rototranslational absorption spectra of H2 and D2 dissolved in argon have been measured at T = 165 K at different densities up to about 650 amagats. These new and accurate measurements allow us to derive reliable experimental profiles for the single rotational line. From the induced dipole moment autocorrelation function as obtained from the experimental profile, we have derived a characteristic time suitable to parametrize the density narrowing of the spectral lines. We show how using this new analysis we can solve the inconsistencies and the ambiguity found in previous works on the narrowing effect. The main features of the narrowing phenomena are discussed with the help of simple models.

Parallel Beam and Focusing X-ray Powder Diffractometry

1988 ◽  
Vol 32 ◽  
pp. 481-488
Author(s):  
W. Parrish ◽  
M. Hart
Keyword(s):  
Lattice Parameter ◽  
Particle Sizes ◽  
Parallel Beam ◽  
Instrument Function ◽  
X Ray ◽  
Experimental Profile ◽  
Beam Geometry ◽  
Parallel Beam Geometry ◽  
Integrated Intensities ◽  
Voigt Function

AbstractComparison of results using synchrotron radiation and X-ray tubes requires a knowledge of the fundamentally different profile shapes inherent in the methods. The varying asymmetric shapes and peak shifts in focusing geometry limit the accuracy and applications of the method and their origins are reviewed. Most o f the focusing aberrations such as specimen displacement, flat specimen and θ-2θ mis-setting do not occur in the parallel beam geometry. The X-ray optics used in synchrotron parallel beam methods produces narrow, symmetrical profiles which can be accurately fit with a pseudo-Voigt function, They have the same shape in the entire pattern. Only the width increases as tanθ due to wavelength dispersion but with higher resolution systems dispersion can be eliminated. The constant instrument function contribution to the experimental profile shape is an important advantage in studies involving profile shapes, e.g., small particle sizes and microstrains, and accurate integrated intensities. The absence of systematic errors leads to more precise lattice parameter determinations.

Simulation Study of IBE Process for III-V Compounds in Mesa and Trenches

1997 ◽  
Vol 490 ◽  
Author(s):  
L. Houlet ◽  
A. Rhallabi ◽  
G. Turban
Keyword(s):  
Ion Beam ◽  
Physical Phenomenon ◽  
Etching Rate ◽  
Pattern Transfer ◽  
Ion Beam Etching ◽  
Ion Energy ◽  
Experimental Profile ◽  
Etching Profile ◽  
Sputtering Yield ◽  
Good Agreement

ABSTRACTThe Ion Beam Etching (IBE) model is developed assuming the analogy between the evolution of hydrodynamic surfaces and that of vacuum-solid interfaces. The main physical phenomenon in the IBE is the ion sputtering where the transfer of ion energy to the surface allows to eject the surface atoms. The local etching rate is thus proportional to the energetic flux and to the sputtering yield. Mask erosion and shadowing are taken into account in the model. The angular dependence of the sputtering yield permits to underscore the faceting and trenching phenomena which respectively represent the formation of the facets in mask comers and the overetching in the trench sides. Besides, the effect of mask erosion on pattern transfer of both trench and mesa structures is studied. In comparison with the experimental profile, the simulated etching profile of the mesa, based on the IBE model, shows a good agreement.

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