49 research outputs found
Derivative corrections to the Born-Infeld action through beta-function calculations in N=2 boundary superspace
We calculate the beta-functions for an open string sigma-model in the
presence of a U(1) background. Passing to N=2 boundary superspace, in which the
background is fully characterized by a scalar potential, significantly
facilitates the calculation. Performing the calculation through three loops
yields the equations of motion up to five derivatives on the fieldstrengths,
which upon integration gives the bosonic sector of the effective action for a
single D-brane in trivial bulk background fields through four derivatives and
to all orders in alpha'. Finally, the present calculation shows that demanding
ultra-violet finiteness of the non-linear sigma-model can be reformulated as
the requirement that the background is a deformed stable holomorphic U(1)
bundle.Comment: 25 pages, numerous figure
Luminal narrowing after percutaneous transluminal coronary angioplasty. A study of clinical, procedural, and lesional factors related to longterm angiographic outcome
Background. The renarrowing process after successful percutaneous transluminal coronary angioplasty
(PTCA) is now believed to be caused by a response-to-injury vessel wall reaction. The magnitude of this
process can be assessed by the change in minimal lumen diameter (MLD) at follow-up angiography. The
aim of the present study was to find independent patient-related, lesion-related, and procedure-related
risk factors for this luminal narrowing process. A model that accurately predicts the amount of luminal
narrowing could be an aid in patient or lesion selection for the procedure, and it could improve assessment
of medium-term (6 months) prognosis. Modification or control of the identified risk factors could reduce
overall restenosis rates, and it could assist in the selection of patients at risk for a large loss in lumen
diameter. This population could then constitute the target population for pharmacological intervention
studies.
Methods and Results. Quantitative angiography was performed on 666 successfully dilated lesions at
angioplasty and at 6-month follow-up. Multivaria
Effects of HeartWare ventricular assist device on the von Willebrand factor: results of an academic Belgian center
Cardiopoietic cell therapy for advanced ischemic heart failure: results at 39 weeks of the prospective, randomized, double blind, sham-controlled CHART-1 clinical trial
Cardiopoietic cells, produced through cardiogenic conditioning of patients' mesenchymal stem cells, have shown preliminary efficacy. The Congestive Heart Failure Cardiopoietic Regenerative Therapy (CHART-1) trial aimed to validate cardiopoiesis-based biotherapy in a larger heart failure cohort
Prediction of second neurological attack in patients with clinically isolated syndrome using support vector machines
The aim of this study is to predict the conversion from clinically isolated syndrome to clinically definite multiple sclerosis using support vector machines. The two groups of converters and non-converters are classified using features that were calculated from baseline data of 73 patients. The data consists of standard magnetic resonance images, binary lesion masks, and clinical and demographic information. 15 features were calculated and all combinations of them were iteratively tested for their predictive capacity using polynomial kernels and radial basis functions with leave-one-out cross-validation. The accuracy of this prediction is up to 86.4% with a sensitivity and specificity in the same range indicating that this is a feasible approach for the prediction of a second clinical attack in patients with clinically isolated syndromes, and that the chosen features are appropriate. The two features gender and location of onset lesions have been used in all feature combinations leading to a high accuracy suggesting that they are highly predictive. However, it is necessary to add supporting features to maximise the accuracy. © 2013 IEEE
Les anticorps antiphospholipides et les fausses couches à répétition
SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Existe-t-il réellement une thrombocytopathie dans la vitréorétinopathie exsudative dominante?
Case ReportsEnglish AbstractJournal Articleinfo:eu-repo/semantics/publishe
Performance of five enzyme immunoassays for the detection of antibodies to beta2 glycoprotein I.
info:eu-repo/semantics/nonPublishe
Dominant exudative vitreoretinopathy: a sporadic case with a normal platelet aggregation study.
Case report of a woman with the characteristics of dominant exudative vitreoretinopathy. These anomalies are however unilateral and the family study is not very contributive. A platelet aggregation study carried out on the patient and 3 family members is normal.Case ReportsJournal ArticleSCOPUS: ar.jinfo:eu-repo/semantics/publishe