Quelle intégration des pays en développement dans le régime climatique ? Le Mécanisme pour un Développement Propre en Asie

En analysant la mise en oeuvre du Mécanisme pour un Développement Propre (MDP), cet article vise à préciser les modalités d'intégration des pays en développement dans le régime climatique afin de s'interroger sur deux aspects particuliers : la dimension régionale de ce mécanisme de flexibilité - dont la plupart des projets ont été accueillis en Asie - et la pertinence des projets MDP face au défi d'une bonne articulation entre les politiques climatiques et les stratégies de développement soutenable. Ces aspects sont analysés dans le cas des pays d'Asie Orientale, qui présentent à la fois un enjeu fort de réduction des émissions de CO2 et une diversité de situations concernant les secteurs ciblés et les politiques énergie-climat

Developing economies in the current climate regime : new prospects for resilience and sustainability ? The case of CDM projects in Asia

23 p.This paper offers a review of the current position of developing countries in the climate regime and international negotiations based primarily on the analysis of implementation of Clean Development Mechanism (CDM). The paper will place emphasis on changes in national policies to accommodate CDM projects, focussing on the scope and rationale for bottom-up policies and measures as part of development strategies favouring more resilience and sustainability. Two issues are addressed more specifically: firstly regional specificity among developing areas and notably the pre-eminence of projects located in Asia, and secondly the relevance of CDM projects for both sustained growth and effective mitigation strategies. Regarding the latter, we consider that CDM project multiplication does question the relevance of national policies and the diversity of actors/stakeholders to foster upgraded domestic well targeted development strategies. Our research considers differences between developing countries and regions regarding selection and implementation of climate mitigation projects- with reference to their GHG emissions and national energy profiles (calculation from Enerdata source and IEA). It refers to selected cases of projects in East Asia - focus on China and Asean countries - showing particular sector selection patterns (differing between semi industrial economies and less developed countries) and diversification of stakeholders for development (role of regional actors within Asia). The analysis is based on international data base of CDM projects (United Nations) and secondary data from IGES (Japan) and Enerdata. The conclusion will examine prospects for CDM in a post 2012 climate régime for developing economies and the future relevance of CDM projects in the framework of Nationally Appropriate Mitigation Actions.A partir d'une analyse de la mise en oeuvre du Mécanisme de Développement Propre, ce papier vise à préciser les modalités d'intégration des pays en développement dans le régime climatique, et en particulier à mettre en évidence une différenciation entre les pays, entre les grandes régions. Ceci permet de s'interroger sur deux aspects peu évoqués jusqu'à présent : d'une part la possible dimension régionale dans les politiques climatiques nationales et internationales et d'autre part la pertinence des projets MDP face au défi d'une bonne articulation entre les efforts des politiques climatiques et la soutenabilité des stratégies de développement. Ces aspects sont analysés plus particulièrement dans le cas de pays d'Asie du sud-est (économies semi-industrialisées et pays moins développés de l'ASEAN). Finalement, on s'interroge sur les enjeux de la transition du régime climatique dans une perspective post-2012

Quelle intégration des pays en développement dans le régime climatique ? Le mécanisme de développement propre en Asie

A partir d'une analyse de la mise en œuvre du Mécanisme de Développement Propre, ce papier vise à préciser les modalités d'intégration des pays en développement dans le régime climatique, et en particulier à mettre en évidence une différenciation entre les pays, entre les grandes régions (première partie). Ceci permet de s'interroger sur deux aspects peu évoqués jusqu'à présent : d'une part la possible dimension régionale dans les politiques climatiques nationales et internationales (deuxième partie) et d'autre part la pertinence des projets MDP face au défi d'une bonne articulation entre les efforts des politiques climatiques et la soutenabilité des stratégies de développement. Ces aspects sont analysés plus particulièrement dans le cas de pays d'Asie orientale. (troisième partie). Finalement, on s'interroge sur les enjeux de la transition du régime climatique dans une perspective post-2012.pays en développement ; pays émergent ; régime climatique ; politique climatique ; politique d'atténuation ; mécanisme de développement propre

Quelle intégration des pays en développement dans le régime climatique ?

En analysant la mise en œuvre du Mécanisme pour un Développement Propre (MDP), cet article vise à préciser les modalités d’intégration des pays en développement dans le régime climatique afin de s’interroger sur deux aspects particuliers : la dimension régionale de ce mécanisme de flexibilité — dont la plupart des projets ont été accueillis en Asie — et la pertinence des projets MDP face au défi d’une bonne articulation entre les politiques climatiques et les stratégies de développement soutenable. Ces aspects sont analysés dans le cas des pays d’Asie Orientale, qui présentent à la fois un enjeu fort de réduction des émissions de CO2 et une diversité de situations concernant les secteurs ciblés et les politiques énergie-climat.This paper focuses on the integration of developing countries in the current climate regime. It considers the implementation of the Clean Development Mechanism (CDM) to address two major issues : firstly the regional dimension of this mechanism — and particularly the leading role of Asia for CDM projects — secondly the relevance of CDM projects as part and parcel of climate policies and sustainable development strategies in Southeast Asia and China where they have been vigorously promoted by local authorities

Sculpting the disk around T Cha: an interferometric view

(Abridged) Circumstellar disks are believed to be the birthplace of planets and are expected to dissipate on a timescale of a few Myr. The processes responsible for the removal of the dust and gas will strongly modify the radial distribution of the dust and consequently the SED. In particular, a young planet will open a gap, resulting in an inner disk dominating the near-IR emission and an outer disk emitting mostly in the far-IR. We analyze a full set of data (including VLTI/Pionier, VLTI/Midi, and VLT/NaCo/Sam) to constrain the structure of the transition disk around TCha. We used the Mcfost radiative transfer code to simultaneously model the SED and the interferometric observations. We find that the dust responsible for the emission in excess in the near-IR must have a narrow temperature distribution with a maximum close to the silicate sublimation temperature. This translates into a narrow inner dusty disk (0.07-0.11 AU). We find that the outer disk starts at about 12 AU and is partially resolved by the Pionier, Sam, and Midi instruments. We show that the Sam closure phases, interpreted as the signature of a candidate companion, may actually trace the asymmetry generated by forward scattering by dust grains in the upper layers of the outer disk. These observations help constrain the inclination and position angle of the outer disk. The presence of matter inside the gap is difficult to assess with present-day observations. Our model suggests the outer disk contaminates the interferometric signature of any potential companion that could be responsible for the gap opening, and such a companion still has to be unambiguously detected. We stress the difficulty to observe point sources in bright massive disks, and the consequent need to account for disk asymmetries (e.g. anisotropic scattering) in model-dependent search for companions.Comment: Removed the word "first" in the abstract of the paper: "obtained with the first 4-telescope combiner (VLTI/Pionier)

Bilateral optic neuropathy related to severe anemia in a patient with alcoholic cirrhosis: A case report and review of the literature

Anemia appears frequently in patients with alcoholic liver disease (ALD) but has never been linked to bilateral nonarteritic anterior ischemic optic neuropathy (NAION). A 65-year-old woman with a medical history of alcoholic cirrhosis was admitted for bilateral NAION. On admission, she was found to have a low arterial pressure and severe normocytic anemia (48 g/L). The anemia was related to chronic bleeding due to antral gastritis along with other factors associated with ALD. The applied treatment consisted of urgent transfusion followed by high doses of proton-pump inhibitors, iron and vitamin supplementation, and support in lifestyle measures. Her hemoglobin levels remained stable after 2 years but the patient still suffered from visual loss. This case highlights the link between anemia and bilateral NAION in ALD patients. The optic nerve head is prone to infarction in this context due to the vascularization characteristics of ALD. Hemoglobin levels should be monitored in ALD patients to avoid the severe complication of NAION

Patent Foramen Ovale Closure or Anticoagulation vs. Antiplatelets after Stroke

BACKGROUND Trials of patent foramen ovale (PFO) closure to prevent recurrent stroke have been inconclusive. We investigated whether patients with cryptogenic stroke and echocardiographic features representing risk of stroke would benefit from PFO closure or anticoagulation, as compared with antiplatelet therapy. METHODS In a multicenter, randomized, open-label trial, we assigned, in a 1:1:1 ratio, patients 16 to 60 years of age who had had a recent stroke attributed to PFO, with an associated atrial septal aneurysm or large interatrial shunt, to transcatheter PFO closure plus long-term antiplatelet therapy (PFO closure group), antiplatelet therapy alone (antiplatelet-only group), or oral anticoagulation (anticoagulation group) (randomization group 1). Patients with contraindications to anticoagulants or to PFO closure were randomly assigned to the alternative noncontraindicated treatment or to antiplatelet therapy (randomization groups 2 and 3). The primary outcome was occurrence of stroke. The comparison of PFO closure plus antiplatelet therapy with antiplatelet therapy alone was performed with combined data from randomization groups 1 and 2, and the comparison of oral anticoagulation with antiplatelet therapy alone was performed with combined data from randomization groups 1 and 3. RESULTS A total of 663 patients underwent randomization and were followed for a mean (+/- SD) of 5.3 +/- 2.0 years. In the analysis of randomization groups 1 and 2, no stroke occurred among the 238 patients in the PFO closure group, whereas stroke occurred in 14 of the 235 patients in the antiplatelet-only group (hazard ratio, 0.03; 95% confidence interval, 0 to 0.26; P<0.001). Procedural complications from PFO closure occurred in 14 patients (5.9%). The rate of atrial fibrillation was higher in the PFO closure group than in the antiplatelet-only group (4.6% vs. 0.9%, P = 0.02). The number of serious adverse events did not differ significantly between the treatment groups (P = 0.56). In the analysis of randomization groups 1 and 3, stroke occurred in 3 of 187 patients assigned to oral anticoagulants and in 7 of 174 patients assigned to antiplatelet therapy alone. CONCLUSIONS Among patients who had had a recent cryptogenic stroke attributed to PFO with an associated atrial septal aneurysm or large interatrial shunt, the rate of stroke recurrence was lower among those assigned to PFO closure combined with antiplatelet therapy than among those assigned to antiplatelet therapy alone. PFO closure was associated with an increased risk of atrial fibrillation

Luminous blue variables: An imaging perspective on their binarity and near environment

Luminous blue variables (LBVs) are rare massive stars with very high luminosity. They are characterized by strong photo-metric and spectroscopic variability related to transient eruptions. The mechanisms at the origin of these eruptions is not well known. In addition, their formation is still problematic and the presence of a companion could help to explain how they form. Aims. This article presents a study of seven LBVs (about 20% of the known Galactic population), some Wolf-Rayet stars, and massive binaries. We probe the environments that surround these massive stars with near-, mid-, and far-infrared images, investigating potential nebula/shells and the companion stars. Methods. To investigate large spatial scales, we used seeing-limited and near diffraction-limited adaptive optics images to obtain a differential diagnostic on the presence of circumstellar matter and to determine their extent. From those images, we also looked for the presence of binary companions on a wide orbit. Once a companion was detected, its gravitational binding to the central star was tested. Tests include the chance projection probability, the proper motion estimates with multi-epoch observations, flux ratio, and star separations. Results. We find that two out of seven of LBVs may have a wide orbit companion. Most of the LBVs display a large circumstellar envelope or several shells. In particular, HD168625, known for its rings, possesses several shells with possibly a large cold shell at the edge of which the rings are formed. For the first time, we have directly imaged the companion of LBV stars

SPICES: Spectro-Polarimetric Imaging and Characterization of Exoplanetary Systems

SPICES (Spectro-Polarimetric Imaging and Characterization of Exoplanetary Systems) is a five-year M-class mission proposed to ESA Cosmic Vision. Its purpose is to image and characterize long-period extrasolar planets and circumstellar disks in the visible (450 - 900 nm) at a spectral resolution of about 40 using both spectroscopy and polarimetry. By 2020/22, present and near-term instruments will have found several tens of planets that SPICES will be able to observe and study in detail. Equipped with a 1.5 m telescope, SPICES can preferentially access exoplanets located at several AUs (0.5-10 AU) from nearby stars ($<$25 pc) with masses ranging from a few Jupiter masses to Super Earths ($\sim$2 Earth radii, $\sim$10 M$_{\oplus}$) as well as circumstellar disks as faint as a few times the zodiacal light in the Solar System

Impact of Emergent Cervical Carotid Stenting in Tandem Occlusion Strokes Treated by Thrombectomy: A Review of the TITAN Collaboration

Introduction: Endovascular therapy has been shown to be an effective and safe treatment for tandem occlusion. The endovascular therapeutic strategies for tandem occlusions strokes have not been adequately evaluated and the best approach is still controversial. The TITAN (Thrombectomy in TANdem occlusions) registry was a result of a collaborative effort to identify the best therapeutic approach for acute ischemic stroke due to tandem lesion. In this review, we aim to summarize the main findings of the TITAN study and discuss the challenges of treatment for tandem occlusion in the era of endovascular thrombectomy.Methods: A review of the data from the multicenter international observational and non-randomized TITAN registry was performed. The TITAN registry included acute ischemic stroke patients with tandem lesions (proximal intracranial occlusion and cervical carotid artery occlusion or stenosis&gt;90%) who were treated with thrombectomy with or without carotid artery stenting.Results: Prior intravenous thrombolysis and emergent cervical carotid stenting were associated with higher reperfusion (mTICI 2b-3 and mTICI 3) rates at the end of the intervention. Poor outcome did not occur more frequently after stenting than after conservative treatment of the cervical carotid lesion. Emergent carotid stenting with antithrombotic agents and intracranial thrombectomy yielded higher reperfusion rate and good outcome (90 day mRS 0–2) compared to other strategies (carotid artery stenting and thrombectomy without antithrombotic, angioplasty and thrombectomy, or thrombectomy alone). Pretreatment intravenous thrombolysis was not associated with increased risk of hemorrhagic complications. Likewise, periprocedural unfractionated heparin did not modify the efficacy and safety results. Etiology of carotid artery lesion (atherosclerosis vs. dissection) did not emerge as predictor of outcome or recanalization.Conclusion: Emergent stenting of the cervical carotid lesion with antithrombotic agents in conjunction to thrombectomy appears to be the best treatment strategy for acute ischemic strokes with tandem lesions. These findings will be further investigated in the ongoing randomized controlled TITAN trial