Joint Downhole and Surface Microseismic Processing Using 3C Template Relative Migration

2016 ◽  
Author(s):  
T. Bardainne ◽  
L. Delmas ◽  
N. Belayouni ◽  
D. Katz ◽  
P.-F. Roux
Keyword(s):  
Relative Migration

Host–parasite co-evolution

2021 ◽  
pp. 389-416
Author(s):  
Paul Schmid-Hempel
Keyword(s):  
Meiotic Recombination ◽  
Evolutionary Process ◽  
Host Switching ◽  
Response To Selection ◽  
Red Queen ◽  
Arms Races ◽  
Migration Rates ◽  
Frequency Changes ◽  
Host Parasite ◽  
Relative Migration

Macroevolutionary patterns concern phylogenies of hosts and their parasites. From those, co-speciation occurs; but host switching is a common evolutionary process and more likely when hosts are close phylogenetically and geographical ranges overlap. Microevolutionary processes refer to allele frequency changes within population. In arms races, traits of hosts and parasites evolve in one direction in response to selection by the other party. With selective sweeps, advantageous alleles rapidly spread in host or parasite population and can become fixed. With antagonistic negative frequency-dependent fluctuations (Red Queen dynamics) genetic polymorphism in populations can be maintained, even through speciation events. A Red Queen co-evolutionary process can favour sexual over asexual reproduction and maintain meiotic recombination despite its other disadvantages (two-fold cost of sex). Local adaptation of host and parasites exist in various combinations; the relative migration rates of the two parties, embedded in a geographical mosaic, are important for this process.

scholarly journals Model-Based Roentgen Stereophotogrammetric Analysis to Monitor the Head–Taper Junction in Total Hip Arthroplasty in Vivo—And They Do Move

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1543 ◽  
Author(s):  
Jing Xu ◽  
Robert Sonntag ◽  
J. Philippe Kretzer ◽  
Dominic Taylor ◽  
Raimund Forst ◽  
...  
Keyword(s):  
Femoral Stem ◽  
Geometrical Shape ◽  
Roentgen Stereophotogrammetric Analysis ◽  
Model Based ◽  
Similar Range ◽  
Standard Marker ◽  
Relative Migration

Model-based Roentgen stereophotogrammetric analysis (RSA) using elementary geometrical shape (EGS) models allows migration measurement of implants without the necessity of additional attached implant markers. The aims of this study were: (i) to assess the possibility of measuring potential head–taper movement in THA in vivo using model-based RSA and (ii) to prove the validity of measured head–taper migration data in vitro and in vivo. From a previous RSA study with a 10 years follow-up, retrospectively for n = 45 patients head–taper migration was calculated as the relative migration between femoral ball head and taper of the femoral stem using model-based RSA. A head–taper migration of 0.026 mm/year can be detected with available RSA technology. In vitro validation showed a total migration of 268 ± 11 µm along the taper axis in a similar range to what has been reported using the RSA method. In vivo, a proof for interchangeable applicability of model-based RSA (EGS) and standard marker-based RSA methods was indicated by a significant deviation within the migration result after 12-month follow-up for all translation measurements, which was significantly correlated to the measured head–taper migration (r from 0.40 to 0.67; p < 0.05). The results identified that model-based RSA (EGS) could be used to detect head–taper migration in vivo and the measured movement could be validated in vitro and in vivo as well. Those findings supported the possibility of applying RSA for helping evaluate the head–taper corrosion related failure (trunnionosis).

Geochemical Inversion - A Modern Approach to Inferring Source-Rock Identity from Characteristics of Accumulated Oil and Gas

1993 ◽  
Vol 11 (3-4) ◽  
pp. 295-328 ◽  
Author(s):  
K.K. Bissada ◽  
L.W. Elrod ◽  
C.R. Robison ◽  
L.M. Darnell ◽  
H.M. Szymczyk ◽  
...  
Keyword(s):  
Source Rock ◽  
Oil And Gas ◽  
Source Rocks ◽  
Specific Information ◽  
Modern Approach ◽  
Age Identity ◽  
Oil And Natural Gas ◽  
Architectural Constraints ◽  
Geologic Setting ◽  
Relative Migration

In recent years, petroleum geochemists have been re-focusing their efforts on developing practical means for inferring, from hydrocarbon chemistry and geologic constraints, the “provenance” of hydrocarbon accumulations, seeps or stains. This capability, referred to here as “Geochemical Inversion”, can be invaluable to the explorationist in deriving clues as to the character, age, identity, maturity and location of an accumulation's source rocks and evaluating a petroleum system's hydrocarbon supply volumetrics. Geochemical inversion is most useful where pertinent source-rock information may be absent because exploratory drilling focused strictly on structural highs and failed to penetrate the deeply buried, effective basinal source facies. Advances in chemical analysis technology over the last decade have facilitated the development of powerful geochemical methods for unravelling of complex chemistries of crude oil and natural gas at the molecular and subatomic levels to extract specific information on the hydrocarbons' source. Inferences on such factors as organic matter make-up, depositional environment, lithology, age and maturity of the source can frequently be drawn. These inferences, together with a sound analysis of the geologic and architectural constraints on the system, can supply clues as to the identity and location of the probable source sequence. This paper describes the principles underlying geochemical “inversion” and provides applications in exploration and exploitation settings. In addition, this paper demonstrates inversion of geochemical characteristics of migrated hydrocarbon fluids to specific attributes of the source. The paper also illustrates the use of systematic variations in fluid chemistry within a geologic setting to infer source location, degree of hydrocarbon mixing and relative migration distance.

Control of relative migration of small inorganic and organic anions with cyclodextrins in capillary electrophoresis (CE)

1998 ◽  
Vol 76 (2) ◽  
pp. 194-198
Author(s):  
Costas Stathakis ◽  
Richard M Cassidy
Keyword(s):  
Capillary Electrophoresis ◽  
Electroosmotic Flow ◽  
Organic Anions ◽  
Sodium Chromate ◽  
Migration Patterns ◽  
Electrophoretic Mobilities ◽  
Potassium Hydrogen ◽  
Capillary Electrophoretic ◽  
Relative Migration ◽  
Inorganic And Organic

The capillary electrophoretic separation of iodide, nitrate, perchlorate, thiocyanate, bromate, iodate, and ethane-, butane-, pentane-, and octanesulphonate was examined in sodium chromate or potassium hydrogen phthalate electrolytes and in the presence of α -, γ -, (0-40 mmol/L) and β -cyclodextrin (0-10 mmol/L). Largest decreases in electrophoretic mobility were observed for iodide, perchlorate, and thiocyanate, probably due to inclusion of these anions in the cyclodextrin (CD) cavity. Changes in migration patterns and electroosmotic flow were observed, which depended on cyclodextrin type and concentration and on electrolyte-cyclodextrin interactions. Thus for larger cavity cyclodextrins ( β-or γ-cyclodextrin) or in the presence of chromate, relatively small decreases in electrophoretic mobilities for all the anions were observed, indicating that a good match between analyte and cavity size and minimal cyclodextrin affinity for electrolyte ions are essential for different migration patterns. Separation efficiencies were between 50 000 and 400 000 theoretical plates, and calibration plots for iodide and octanesulphonate were linear; R2 = 0.998 and 0.9999, respectively, in the concentration range (5 x 10-5)-(5 x 10-3) mol/L.Key words: capillary electrophoresis, inorganic and organic anions, cyclodextrins, inclusion complex, electroosmotic flow control.

scholarly journals Hamiltonian model of capture into mean motion resonance

2010 ◽  
Vol 6 (S276) ◽  
pp. 300-303 ◽  
Author(s):  
Alexander J. Mustill ◽  
Mark C. Wyatt
Keyword(s):  
Extrasolar Planets ◽  
Kuiper Belt ◽  
Mean Motion Resonances ◽  
Migration Rates ◽  
Mean Motion ◽  
Hamiltonian Model ◽  
Planet Migration ◽  
High Migration ◽  
Relative Migration ◽  
Probability Of Capture

AbstractMean motion resonances are a common feature of both our own Solar System and of extrasolar planetary systems. Bodies can be trapped in resonance when their orbital semi-major axes change, for instance when they migrate through a protoplanetary disc. We use a Hamiltonian model to thoroughly investigate the capture behaviour for first and second order resonances. Using this method, all resonances of the same order can be described by one equation, with applications to specific resonances by appropriate scaling. We focus on the limit where one body is a massless test particle and the other a massive planet. We quantify how the the probability of capture into a resonance depends on the relative migration rate of the planet and particle, and the particle's eccentricity. Resonant capture fails for high migration rates, and has decreasing probability for higher eccentricities, although for certain migration rates, capture probability peaks at a finite eccentricity. We also calculate libration amplitudes and the offset of the libration centres for captured particles, and the change in eccentricity if capture does not occur. Libration amplitudes are higher for larger initial eccentricity. The model allows for a complete description of a particle's behaviour as it successively encounters several resonances. The model is applicable to many scenarios, including (i) Planet migration through gas discs trapping other planets or planetesimals in resonances; (ii) Planet migration through a debris disc; (iii) Dust migration through PR drag. The Hamiltonian model will allow quick interpretation of the resonant properties of extrasolar planets and Kuiper Belt Objects, and will allow synthetic images of debris disc structures to be quickly generated, which will be useful for predicting and interpreting disc images made with ALMA, Darwin/TPF or similar missions. Full details can be found in Mustill & Wyatt (2011).

Prevention of relative migration of the implant and the skin in murine model

Burns ◽  
2013 ◽  
Vol 39 (4) ◽  
pp. 820-822
Author(s):  
Qingfeng Li ◽  
Xiaolu Huang ◽  
Hainan Zhu
Keyword(s):  
Murine Model ◽  
Relative Migration

scholarly journals Combined Effects of Gold Nanoparticles and Ionizing Radiation on Human Prostate and Lung Cancer Cell Migration

2019 ◽  
Vol 20 (18) ◽  
pp. 4488 ◽  
Author(s):  
Elham Shahhoseini ◽  
Bryce N. Feltis ◽  
Masao Nakayama ◽  
Terrence J. Piva ◽  
Dodie Pouniotis ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Cell Migration ◽  
Ionizing Radiation ◽  
Cell Lines ◽  
Cancer Cell ◽  
A549 Cells ◽  
Human Prostate ◽  
Cell Monolayers ◽  
Altered Cell ◽  
Relative Migration

The effect of 15 nm-sized gold nanoparticles (AuNPs) and/or ionizing radiation (IR) on the migration and adhesion of human prostate (DU145) and lung (A549) cancer cell lines was investigated. Cell migration was measured by observing the closing of a gap created by a pipette tip on cell monolayers grown in 6-well plates. The ratio of the gap areas at 0 h and 24 h were used to calculate the relative migration. The relative migration of cells irradiated with 5 Gy was found to be 89% and 86% for DU145 and A549 cells respectively. When the cells were treated with 1 mM AuNPs this fell to ~75% for both cell lines. However, when the cells were treated with both AuNPs and IR an additive effect was seen, as the relative migration rate fell to ~60%. Of interest was that when the cells were exposed to either 2 or 5 Gy IR, their ability to adhere to the surface of a polystyrene culture plate was significantly enhanced, unlike that seen for AuNPs. The delays in gap filling (cell migration) in cells treated with IR and/or AuNPs can be attributed to cellular changes which also may have altered cell motility. In addition, changes in the cytoskeleton of the cancer cells may have also affected adhesiveness and thus the cancer cell’s motility response to IR.

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