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"Pascal, Nicolas"
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The colonial legacy in France : fracture, rupture, and apartheid
\"Debates about the legacy of colonialism in France are not new, but they have taken on new urgency in the wake of recent terrorist attacks. Responding to acts of religious and racial violence in 2005, 2010, and 2015 and beyond, the essays in this volume pit French ideals against government-sponsored revisionist decrees that have exacerbated tensions, complicated the process of establishing and recording national memory, and triggered divisive debates on what it means to identify as French. As they document the checkered legacy of French colonialism, the contributors raise questions about France and the contemporary role of Islam, the banlieues, immigration, race, history, pedagogy, and the future of the Republic. This innovative volume reconsiders the cultural, economic, political, and social realities facing global French citizens today and includes contributions by Achille Mbembe, Benjamin Stora, Franًcoise Vergلes, Alec Hargreaves, Elsa Dorlin, and Alain Mabanckou, among others\"--Provided by publisher.
Book
Retrieval of Cloud Properties Using CALIPSO Imaging Infrared Radiometer. Part I: Effective Emissivity and Optical Depth
The paper describes the operational analysis of the Imaging Infrared Radiometer (IIR) data, which have been collected in the framework of the Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observation ( CALIPSO ) mission for the purpose of retrieving high-altitude (above 7 km) cloud effective emissivity and optical depth that can be used in synergy with the vertically resolved Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) collocated observations. After an IIR scene classification is built under the CALIOP track, the analysis is applied to features detected by CALIOP when found alone in the atmospheric column or when CALIOP identifies an opaque layer underneath. The fast-calculation radiative transfer (FASRAD) model fed by ancillary meteorological and surface data is used to compute the different components involved in the effective emissivity retrievals under the CALIOP track. The track analysis is extended to the IIR swath using homogeneity criteria that are based on radiative equivalence. The effective optical depth at 12.05 μ m is shown to be a good proxy for about one-half of the cloud optical depth, allowing direct comparisons with other databases in the visible spectrum. A step-by-step quantitative sensitivity and performance analysis is provided. The method is validated through comparisons of collocated IIR and CALIOP optical depths for elevated single-layered semitransparent cirrus clouds, showing excellent agreement (within 20%) for values ranging from 1 down to 0.05. Uncertainties have been determined from the identified error sources. The optical depth distribution of semitransparent clouds is found to have a nearly exponential shape with a mean value of about 0.5–0.6.
Journal Article
Private Capital to Improve Nature-Based Solutions for Coastal Protection: Time for a Boost
Coastal protection, an important coral reef ecosystem service, is threatened by increasing coral mortality, exacerbated by global climate change. Nature-based solutions in the form of coral restoration, while not perfect, can assist in rebuilding reef structure and improving the flow of the service for some sites. With a financing gap existing between what is required for conservation and what is being accessed, private investors should be playing a larger role in such restoration activities. Especially so as coastal hoteliers in particular, benefit from stable beaches and also have additional income generating potential with healthy reefs. Blended finance solutions in particular, are especially suited to restoration that incorporates substrate addition, while payments for ecosystem services are more suited to coral gardening. Conservation and finance practitioners must engage further and understand each other’s worlds, in order for these private sources to be effectively sourced and utilized.
Journal Article
Stewarding National User Groups to Strengthen Open Source Software Communities
Open Source Software (OSS) communities are often international, bringing together people from diverse regions with different linguistic and cultural backgrounds. National user groups can bolster these international communities by convening local events, championing the software to peers, welcoming and onboarding new contributors, raising money to support the broader community, and collecting important information on user’s needs. The open source community-led software DSpace has had great success encouraging the creation of national user groups; in the UK, North America, and Germany, the Groups have been active for many years. However, it was in 2018, thanks to a renewed focus on international engagement and more diverse representation of the global community in governance groups, that the national communities entered into a new phase: 15 new national User Groups have been formed all over the world since then, while the German user group evolved into the “DSpace-Konsortium Deutschland”, founded by 25 institutions, marking a pivotal point for membership options and National User Group participation within DSpace Governance. This article will offer an overview of the historical development of the DSpace community and its governance model, as well as DuraSpace’s international engagement strategy, including its benefits and challenges. Subsequently, we will present a case study on the DSpace-Konsortium Deutschland and explain its relation to the broader context of how to build national user groups within global communities.
Journal Article
Cyanobacteria and Macroinvertebrate Relationships in Freshwater Benthic Communities beyond Cytotoxicity
Cyanobacteria are harmful algae that are monitored worldwide to prevent the effects of the toxins that they can produce. Most research efforts have focused on direct or indirect effects on human populations, with a view to gain easy accurate detection and quantification methods, mainly in planktic communities, but with increasing interest shown in benthos. However, cyanobacteria have played a fundamental role from the very beginning in both the development of our planet’s biodiversity and the construction of new habitats. These organisms have colonized almost every possible planktic or benthic environment on earth, including the most extreme ones, and display a vast number of adaptations. All this explains why they are the most important or the only phototrophs in some habitats. The negative effects of cyanotoxins on macroinvertebrates have been demonstrated, but usually under conditions that are far from natural, and on forms of exposure, toxin concentration, or composition. The cohabitation of cyanobacteria with most invertebrate groups is long-standing and has probably contributed to the development of detoxification means, which would explain the survival of some species inside cyanobacteria colonies. This review focuses on benthic cyanobacteria, their capacity to produce several types of toxins, and their relationships with benthic macroinvertebrates beyond toxicity.
Journal Article
Possibilistic uncertainty handling for answer set programming
In this work, we introduce a new framework able to deal with a reasoning that is at the same time non monotonic and uncertain. In order to take into account a certainty level associated to each piece of knowledge, we use possibility theory to extend the non monotonic semantics of stable models for logic programs with default negation. By means of a possibility distribution we define a clear semantics of such programs by introducing what is a possibilistic stable model. We also propose a syntactic process based on a fix-point operator to compute these particular models representing the deductions of the program and their certainty. Then, we show how this introduction of a certainty level on each rule of a program can be used in order to restore its consistency in case of the program has no model at all. Furthermore, we explain how we can compute possibilistic stable models by using available softwares for Answer Set Programming and we describe the main lines of the system that we have developed to achieve this goal.
Journal Article
PolyMorph: Extension of PolyHoop for tissue morphogenesis coupled to chemical signaling
We present PolyMorph, a lightweight standalone C++ program that extends its predecessor PolyHoop by a finite-difference solver for multi-component reaction-advection-diffusion equations. PolyMorph simulates two integral parts of tissue morphogenesis in two dimensions: 1) the mechanics of cellular deformation, growth and proliferation, and 2) transport and reaction of an arbitrary number of chemical species. Both of these components are bidirectionally coupled, allowing cells to base their behavior on local information on concentrations and flow, and allowing the chemical transport and reaction kinetics to depend on spatial information such as the local cell type. This bidirectional feedback makes PolyMorph a versatile tool to study a variety of cellular morphogenetic processes such as chemotaxis, cell sorting, tissue patterning with morphogen gradients, Turing patterning, and diffusion- or supply-limited growth with sub-cellular resolution.
Paper