Multiparty compatibility in communicating automata: characterisation and synthesis of global session types

Multiparty session types are a type system that can ensure the safety and liveness of distributed peers via the global specification of their interactions. To construct a global specification from a set of distributed uncontrolled behaviours, this paper explores the problem of fully characterising multiparty session types in terms of communicating automata. We equip global and local session types with labelled transition systems (LTSs) that faithfully represent asynchronous communications through unbounded buffered channels. Using the equivalence between the two LTSs, we identify a class of communicating automata that exactly correspond to the projected local types. We exhibit an algorithm to synthesise a global type from a collection of communicating automata. The key property of our findings is the notion of multiparty compatibility which non-trivially extends the duality condition for binary session types

Behavioral types in programming languages

A recent trend in programming language research is to use behav- ioral type theory to ensure various correctness properties of large- scale, communication-intensive systems. Behavioral types encompass concepts such as interfaces, communication protocols, contracts, and choreography. The successful application of behavioral types requires a solid understanding of several practical aspects, from their represen- tation in a concrete programming language, to their integration with other programming constructs such as methods and functions, to de- sign and monitoring methodologies that take behaviors into account. This survey provides an overview of the state of the art of these aspects, which we summarize as the pragmatics of behavioral types

The CanOE Strategy: Integrating Genomic and Metabolic Contexts across Multiple Prokaryote Genomes to Find Candidate Genes for Orphan Enzymes

Of all biochemically characterized metabolic reactions formalized by the IUBMB, over one out of four have yet to be associated with a nucleic or protein sequence, i.e. are sequence-orphan enzymatic activities. Few bioinformatics annotation tools are able to propose candidate genes for such activities by exploiting context-dependent rather than sequence-dependent data, and none are readily accessible and propose result integration across multiple genomes. Here, we present CanOE (Candidate genes for Orphan Enzymes), a four-step bioinformatics strategy that proposes ranked candidate genes for sequence-orphan enzymatic activities (or orphan enzymes for short). The first step locates “genomic metabolons”, i.e. groups of co-localized genes coding proteins catalyzing reactions linked by shared metabolites, in one genome at a time. These metabolons can be particularly helpful for aiding bioanalysts to visualize relevant metabolic data. In the second step, they are used to generate candidate associations between un-annotated genes and gene-less reactions. The third step integrates these gene-reaction associations over several genomes using gene families, and summarizes the strength of family-reaction associations by several scores. In the final step, these scores are used to rank members of gene families which are proposed for metabolic reactions. These associations are of particular interest when the metabolic reaction is a sequence-orphan enzymatic activity. Our strategy found over 60,000 genomic metabolons in more than 1,000 prokaryote organisms from the MicroScope platform, generating candidate genes for many metabolic reactions, of which more than 70 distinct orphan reactions. A computational validation of the approach is discussed. Finally, we present a case study on the anaerobic allantoin degradation pathway in Escherichia coli K-12

A Protocol Compiler for Secure Sessions in ML

Distributed applications can be structured using sessions that specify flows of messages between roles. We design a small specific language to declare sessions. We then build a compiler, called s2ml, that transforms these declarations down to ML modules securely implementing the sessions. Every run of a well-typed program executing a session through its generated module is guaranteed to follow the session specification, despite any low-level attempt by coalitions of remote peers to deviate from their roles. We detail the inner workings of our compiler, along with our design choices, and illustrate the usage of s2ml with two examples: a simple remote procedure call session, and a complex session for a conference management system

Étude thermodynamique de sels fondus a anion polyatomique

The abundance of data obtained by measuring the specific heat under constant pressure, the sound velocity and the expansivity provides a rich source of empirical information with which one can develop a thermodynamic study of molten salts with polyatomic anions. When applied to molten alkali sulphates, chromates, molybdates and tungstates, this approach reveals their high compactness as characterized by a low coefficient of compressibility (from 1 to 2 × 10 -10 Pa-1), a small free volume (from 1 to 3 Å3), a high internal pressure (about 0.2 × 1010 Pa) and a high specific heat at a constant volume (from 40 to 47 cal mol-1 K-1). The properties studied have been analyzed in relation to a coefficient characterizing the geometry of the ions of each salt.Les mesures conjointes de la chaleur spécifique à pression constante Cp, de la vitesse du son u et du coefficient de dilatation α mènent à un ensemble de données dont la richesse permet une approche satisfaisante, tant macroscopique que microscopique, du milieu étudié. L'application de cette méthode aux sulfates, chromates, molybdates et tungstates alcalins fondus a permis de montrer la grande compacité de ces sels caractérisée par un faible coefficient de compressibilité (de 1 à 2 ×10-1 Pa-1), un faible volume libre (de 1 à 3 Å3), une forte pression interne (de l'ordre de 0,2 x 1010 Pa) et une chaleur spécifique à volume constant élevée (de 40 à 47 cal mol-1 K-1). L'ensemble des propriétés étudiées est analysé en fonction d'un facteur caractéristique de la géométrie des ions constituant les sels

Aboveground test of an advanced Li2_2MoO4_4 scintillating bolometer to search for neutrinoless double beta decay of 100^{100}Mo

Large lithium molybdate (Li2MoO4) crystal boules were produced by using the low thermal gradient Czochralski growth technique from deeply purified molybdenum. A small sample from one of the boules was preliminary characterized in terms of X-ray-induced and thermally-excited luminescence. A large cylindrical crystalline element (with a size of circle divide 40 x 40 mm) was used to fabricate a scintillating bolometer, which was operated aboveground at similar to 15 mK by using a pulse-tube cryostat housing a high-power dilution refrigerator. The excellent detector performance in terms of energy resolution and alpha background suppression along with preliminary positive indications on the radiopurity of this material show the potentiality of Li2MoO4 scintillating bolometers for low-counting experiment to search for neutrinoless double beta decay of Mo-100. (C) 2015 Elsevier B.V. All rights reserved