160 research outputs found
Patello-Femoral Arthroplasty- Indications and Contraindications
No full text: Patellofemoral arthroplasty (PFA) is emerging as an attractive alternative to total knee arthroplasty (TKA) for isolated patellofemoral-osteoarthritis (PF-OA) for selected patients. The success of PFA is highly dependent on patient selection. This intervention is still burdened with a higher rate of revisions and a lower survival rate than TKA when the indications or the surgical technique are not optimal. We highlight the indications and contraindications of PFA to obtain satisfying functional outcomes and survivorship. Preoperative clinical and radiological assessment is critical to determine the presence of PFA indications, the absence of contraindications, and the necessity of any associated procedures, particularly for the tibial tubercle. The typical indications are patients with isolated symptomatic PF-OA, with trochlear dysplasia, when bone-on-bone Iwano 4 osteoarthritis is observed, without significant malalignment, and with the absence of risk factors for developing progressive tibiofemoral-OA. The three main causes of isolated PF-OA are primary OA, trochlear dysplasia, and posttraumatic OA following patellar fracture. Trochlear dysplasia is the preferred indication for PFA. Lack of experience with arthroplasty or realignment of the extensor mechanism is a relative contraindication to performing PFA
Death at First Sight: The Duality of Love in Thibaut de Champagne and Ibn Quzman
No full textThis study compares between the secular love poetry of thirteenth-century trouvère Thibaut de Champagne and twelfth-century Andalusian author Ibn Quzman. Both poets portray passion as binary, since it incites both joy and pain. Their individual meditations on the duality of love focus especially on visual contemplation of beauty as the impetus to love. However, the effects of seeing beauty, like courtly love itself, are also binary. Both Thibaut de Champagne and Ibn Quzman attempt to deal with this optical paradox through the idealization of human passion: each poet sets up the beloved as an object of worship. In Thibaut, this appears as an ennobling, courtly love religion; while Ibn Quzman's visual considerations of beauty end up in sensual flesh worship. Without a way to settle the tension between joy and grief of profane love, the poet finally succumbs to passion in martyrdom; such a fate is seen in Thibaut and Ibn Quzman not only as inevitable, but also desirable
The life cycle of non-polio enteroviruses and how to target it (vol 16, pg 368, 2018)
No full textIn the version of this Review originally published, co-author Hendrik Jan Thibaut's name was incorrectly indexed as "Jan Thibaut, H". It should have appeared as "Thibaut, HJ". This has now been corrected in all versions of the Review. The publisher apologizes to the authors and to readers for this error.status: Publishe
Publisher Correction: Cryo-EM structure of human class C orphan GPCR GPR179 involved in visual processing
No full textCorrection to: Nature Communicationshttps://doi.org/10.1038/s41467-024-52584-z, published online 27 September 2024 In this article Thibaut Laboute should have been denoted as an equally contributing author. The original article has been updated. © The Author(s) 2024
Impact of social media on customers' purchase decision : case: Chocolaterie Thibaut, France
No full textDue to the digital revolution, people are more and more connected to each other, which make access to information easier. It has also changed the way people consume. Craft companies in the French market of the food industry are numerous, as food is part of local culture. However, even if this industry sector is promising, small and individual companies do not have the necessary resources to invest in order to advertise in a proper traditional way. Therefore, digital marketing has become a remarkable asset for such companies as it is a low-cost advertisement.
This thesis studies the way small companies could use social media platforms in order to influence customers’ purchase decision to provide guidance for the case study company, Chocolaterie Thibaut, France. During this research, a mixed method was applied using both questionnaire and interview design by the author to collect data.
During this process, the author underlines that the company seems to reach its customers’ expectations by offering high-quality products. According to the population sample, 51% of the company’s customers are female over 50 years old. This result might be the reason why 60% of customers were not aware of the company’s Facebook page
Poroelastic response of mid-ocean ridge hydrothermal systems to ocean tidal loading : implications for shallow permeability structure
No full textAuthor Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 43 (2016): 1660–1668, doi:10.1002/2015GL066479.We use the time delay between tidal loading and exit-fluid temperature response for hydrothermal vents to model the poroelastic behavior and shallow upflow zone (SUZ) effective permeability structure of three mid-ocean ridge (MOR) sites with different spreading rates. Hydrothermal vents at Lucky Strike field exhibit relatively small phase lags corresponding to high SUZ effective permeabilities of ≥ ~10−10 m2, with variations that we interpret as resulting from differences in the extrusive layer thickness. By contrast, vents at East Pacific Rise site exhibit relatively large phase lags corresponding to low SUZ effective permeabilities of ≤ ~10−13 m2. Vents at Main Endeavour field exhibit both high and low phase lags, suggestive of a transitional behavior. Our results demonstrate that tidal forcing perturbs hydrothermal flow across the global MOR system, even in places where the tidal amplitude is very low, and that the flow response can be used to constrain variations in SUZ permeability structure beneath individual vent fields.This research was funded by Woods Hole Oceanographic Institution (USA). Thibaut Barreyre was supported by WHOI's Deep Ocean Exploration Institute (DOEI) postdoctoral scholarship.2016-08-2
The song "Nuns ne poroit de mavaise raison" (RS 1887, L 265.1222) and its attribution to Thibaut de Champagne
No full textLa canzone Nuns ne poroit de mavaise raison (RS 1887, L
265.1222) è considerata un testo enigmatico a causa della difficoltà di identificarne
con verosimiglianza l’autore, per cui sono state avanzate diverse
ipotesi, anche se secondo la vulgata disporremmo di notizie precise circa la
sua composizione. Essa costituisce un invito pressante, pronunciato con una
franchezza rimarchevole, ai limiti della rudezza, dall’anonimo nei confronti
del re Luigi IX affinché non abbandoni la Terra Santa dopo la disfatta di
Fariskur del 6 aprile dello stesso anno, in seguito alla quale il re e gran parte
del suo esercito furono imprigionati dai musulmani d’Egitto. Un’analisi
accurata del contenuto del testo e della sua struttura, non condizionata dalla
definizione di Gaston Paris risalente al 1893 il quale la etichettò da allora
senza alcun dubbio come «la chanson composée à Acre en juin 1250», consente
ora di avanzare una nuova ipotesi di attribuzione al grande troviere
Thibaut de Champagne.The song Nuns ne poroit de mavaise raison (RS 1887, L
265.1222) is considered an enigmatic text due to the difficulty in identifying
its author. Several hypotheses have been proposed, despite the widespread
belief that precise information about its composition is available. The song
represents a forceful appeal—expressed with striking frankness, at times
bordering on rudeness—by an anonymous voice urging King Louis IX not
to abandon the Holy Land. This appeal followed the defeat at Fariskur on
April 6 of the same year, after which the king and a large part of his army
were captured by Egyptian Muslims. A close analysis of the song’s content
and structure, freed from the constraints of Gaston Paris’s 1893 definition—
where he unequivocally labeled it as “la chanson composée à Acre en juin
1250”—now allows for a new attribution hypothesis: that the song may
have been composed by the renowned trouvère Thibaut de Champagne
simpeg-research/Astic-2020-JointInversion: Joint inversion of synthetic potential fields data based on the DO-27 kimberlite pipe
No full textSummary
We present a framework for petrophysically and geologically guided inversion to perform multi-physics joint inversions. Petrophysical and geological information is included in a multi-dimensional Gaussian mixture model that regularizes the inverse problem. The inverse problem we construct consists of a suite of three cyclic optimizations over the geophysical, petrophysical and geological information. The two additional problems over the petrophysical and geological data are used as a coupling term. They correspond to updating the geophysical reference model and regularization weights. This guides the inverse problem towards reproducing the desired petrophysical and geological characteristics. The objective function that we define for the inverse problem is comprised of multiple data misfit terms: one for each geophysical survey and one for the petrophysical properties and geological information. Each of these misfit terms has its own target misfit value which we seek to fit in the inversion. Our framework is modular and extensible and this allows us to combine multiple geophysical methods in a joint inversion and to distribute open-source code and reproducible examples. To illustrate the gains made by multi-physics inversions, we apply our framework to jointly invert, in 3D, synthetic potential fields data based on the DO- kimberlite pipe case study (Northwest Territories, Canada). The pipe contains two distinct kimberlite facies embedded in a host rock. We show that inverting the datasets individually, even with petrophysical information, leads to a binary geologic model consisting of background or kimberlite. A joint inversion, with petrophysical information, can differentiate the two main kimberlite facies of the pipe.
Contents
Geology surfaces folder: Geology surfaces built from drillholes
Forward folder: Scripts to forward model the magnetic and gravity data from the geological surfaces
L2 inversion folder: Jupyter notebooks to run Tikhonov (L2) inversions and Sparse (Lp-Lq) inversion of the gravity and magnetic data.
Petrophysics folder: Jupyter notebook to build the GMM objects for all the PGI inversions.
PGI individual inversion: Jupyter notebooks to perform PGI inversions of the gravity and magnetic data individually, each with the PK and HK signature respectively.
PGI joint inversion: Jupyter notebook to perform the joint PGI inversion with full petrophysical knowledge
PGI Joint no petrophysical means: Jupyter notebook to perform the joint PGI inversion without petrophysical knowledge
Usage
Dependencies are specified in requirements.txt
pip install -r requirements.txt
To run the notebooks locally, you will need to have python installed, preferably through anaconda .
You can then clone this repository. From a command line, run
git clone https://github.com/simpeg-research/Astic-2020-JointInversion.git
Then cd into the Astic-2020-JointInversion directory:
cd Astic-2020-JointInversion
To setup your software environment, we recommend you use the provided conda environment
conda env create -f environment.yml
conda activate pgijoint-environment
alternatively, you can install dependencies through pypi
pip install -r requirements.txt
You can then launch Jupyter
jupyter notebook
Jupyter will then launch in your web browser.
Running the notebooks
Each cell of code can be run with shift + enter or you can run the entire notebook by selecting cell, Run All in the toolbar.
For more information on running Jupyter notebooks, see the Jupyter Documentation
Issues
Please make an issue if you encounter any problems while trying to run the notebooks.
Citations
If you build upon or use these examples in your work, please cite:
Astic, T., L. J. Heagy, and D. W. Oldenburg, 2020, Joint geophysical, petrophysical and geologic inversion using a dynamic Gaussian mixture model, submitted to Geophysical Journal International.
Astic, T., and D. W. Oldenburg, 2019, A framework for petrophysically and geologically guided geophysical inversion using a dynamic Gaussian mixture model prior: Geophysical Journal International, 219, 1989-2012. https://doi.org/10.1093/gji/ggz389
Astic, T. and D. W. Oldenburg, 2018, Petrophysically guided geophysical inversion using a dynamic Gaussian mixture model prior. In SEG Technical Program Expanded Abstracts 2018 (pp. 2312-2316). https://doi.org/10.1190/segam2018-2995155.1
@article{AsticJoint,
author = {Thibaut Astic and Lindey J. Heagy and Douglas W. Oldenburg},
title = {Joint geophysical, petrophysical and geologic inversion using a dynamic Gaussian mixture model},
journal = {Submitted to Geophysical Journal International},
year = {2020}
}
@article{ggz389,
author = {Astic, Thibaut and Oldenburg, Douglas W},
title = "{A framework for petrophysically and geologically guided geophysical inversion using a dynamic Gaussian mixture model prior}",
journal = {Geophysical Journal International},
volume = {219},
number = {3},
pages = {1989-2012},
year = {2019},
month = {08},
issn = {0956-540X},
doi = {10.1093/gji/ggz389},
url = {https://doi.org/10.1093/gji/ggz389},
eprint = {http://oup.prod.sis.lan/gji/article-pdf/219/3/1989/30144784/ggz389.pdf},
}
@inbook{Astic2018,
author = {Thibaut Astic and Douglas W. Oldenburg},
title = {Petrophysically guided geophysical inversion using a dynamic Gaussian mixture model prior},
booktitle = {SEG Technical Program Expanded Abstracts 2018},
chapter = {},
pages = {2312-2316},
year = {2018},
doi = {10.1190/segam2018-2995155.1},
URL = {https://library.seg.org/doi/abs/10.1190/segam2018-2995155.1},
eprint = {https://library.seg.org/doi/pdf/10.1190/segam2018-2995155.1}
}
If you are using `SimPEG`, please cite:
Cockett, Rowan, Seogi Kang, Lindsey J. Heagy, Adam Pidlisecky, and Douglas W. Oldenburg. "SimPEG: An Open Source Framework for Simulation and Gradient Based Parameter Estimation in Geophysical Applications" Computers & Geosciences, September 2015. https://doi.org/10.1016/j.cageo.2015.09.015.
@article{Cockett2015,
author = {Cockett, Rowan and Kang, Seogi and Heagy, Lindsey J. and Pidlisecky, Adam and Oldenburg, Douglas W.},
doi = {10.1016/j.cageo.2015.09.015},
issn = {00983004},
journal = {Computers and Geosciences},
keywords = {Electromagnetics,Geophysics,Inversion,Numerical modeling,Object-oriented programming,Sensitivities},
pages = {142--154},
publisher = {Elsevier},
title = {{SimPEG: An open source framework for simulation and gradient based parameter estimation in geophysical applications}},
url = {http://dx.doi.org/10.1016/j.cageo.2015.09.015},
volume = {85},
year = {2015}
}
If you are using the Electromagnetics Simulations & Inversions capabilities of `SimPEG`, please cite:
Lindsey J. Heagy, Rowan Cockett, Seogi Kang, Gudni K. Rosenkjaer, Douglas W. Oldenburg. "A framework for simulation and inversion in electromagnetics" Computers & Geosciences, September 2017. https://doi.org/10.1016/j.cageo.2017.06.018
@article{heagy2017framework,
title = {A framework for simulation and inversion in electromagnetics},
journal = {Computers \& Geosciences},
volume = {107},
pages = {1-19},
year = {2017},
issn = {0098-3004},
doi = {https://doi.org/10.1016/j.cageo.2017.06.018},
url = {http://www.sciencedirect.com/science/article/pii/S0098300416303946},
author = {Lindsey J. Heagy and Rowan Cockett and Seogi Kang and Gudni K. Rosenkjaer and Douglas W. Oldenburg},
keywords = {Geophysics, Numerical modelling, Finite volume, Sensitivities, Object oriented}
}
License
These scripts and notebooks are licensed under the MIT License which allows academic and commercial re-use and adaptation of this work
A note on the sine table in ancient India
No full textIn course of a correspondence with the author, Sri T. S. Kuppanna Sastry has drawn attention to the fact that the radius (trijya) used by Varahamihira in his Pancasiddhantika should be 120' and not 120' 1" which follows from the emended version of the text of Pancasiddhdntika, edited by Thibaut and Sudhakara1. I have further looked into the matter and find that Thibaut and Sudliakara have made some wrong emendations in some portion of the original Sanskrit terms2. Due to this emendation, some errors have crept in the results of jya-lengths given in my previous published paper
A note on the sine table in ancient India
No full textIn course of a correspondence with the author, Sri T. S. Kuppanna Sastry has drawn attention to the fact that the radius (trijya) used by Varahamihira in his Pancasiddhantika should be 120' and not 120' 1" which follows from the emended version of the text of Pancasiddhdntika, edited by Thibaut and Sudhakara1. I have further looked into the matter and find that Thibaut and Sudliakara have made some wrong emendations in some portion of the original Sanskrit terms2. Due to this emendation, some errors have crept in the results of jya-lengths given in my previous published paper
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