pinecone/core-2020-05-10-deduplication huggingface dataset:
Reverse Engineering Architectural Feature Models

International audienceReverse engineering the variability of an existing system is a challenging activity. The architect knowledge is essential to identify variation points and explicit constraints between features, for instance in feature models (FMs), but the manual creation of FMs is both timeconsuming and error-prone. On a large scale, it is very difficult for an architect to guarantee that the resulting FM ensures a safe composition of the architectural elements when some features are selected. In this paper, we present a comprehensive, tool supported process for reverse engineering architectural FMs. We develop automated techniques to extract and combine different variability descriptions of an architecture. Then, alignment and reasoning techniques are applied to integrate the architect knowledge and reinforce the extracted FM. We illustrate the reverse engineering process when applied to a representative software system, FraSCAti, and we report on our experience in this context
Polarization analysis of CuXX-lines emitted from X-pinch

International audienceSoft x-ray emission from CuXX L-shell lines emitted by a dense X-pinch plasma have been investigated with high-resolution curved Bragg crystals at different angles of orientation. Single shot time integrated spectra show clear evidences of polarization for the Ne-like spectral lines 2s22p6 1S0 → 2s22p53s 1P1 (λ = 12.570 Å), 2s22p6 1S0 → 2s22p53s 3P1 (λ = 12.8277 Å). The variation of the intensity ratio of these two well-separated L-shell lines is discussed in view of its application for suprathermal electron characterization under real experimental conditions of pinch plasmas. We demonstrated that the simultaneous use of two different polarization spectrometers (means 4 Bragg crystals) permitted a high level of confidence for the analysis of the variation of the line ratios due to polarization
Effects of an axial flow on the centrifugal, elliptic and hyperbolic instabilities in Stuart vortices

International audienceLinear stability of the Stuart vortices in the presence of an axial flow is studied. The local stability equations derived by Lifschitz & Hameiri (Phys. Fluids A, vol. 3 (11), 1991, pp. 2644–2651) are rewritten for a three-component (3C) two-dimensional (2D) base flow represented by a 2D streamfunction and an axial velocity that is a function of the streamfunction. We show that the local perturbations that describe an eigenmode of the flow should have wavevectors that are periodic upon their evolution around helical flow trajectories that are themselves periodic once projected on a plane perpendicular to the axial direction. Integrating the amplitude equations around periodic trajectories for wavevectors that are also periodic, it is found that the elliptic and hyperbolic instabilities, which are present without the axial velocity, disappear beyond a threshold value for the axial velocity strength. Furthermore, a threshold axial velocity strength, above which a new centrifugal instability branch is present, is identified. A heuristic criterion, which reduces to the Leibovich & Stewartson criterion in the limit of an axisymmetric vortex, for centrifugal instability in a non-axisymmetric vortex with an axial flow is then proposed. The new criterion, upon comparison with the numerical solutions of the local stability equations, is shown to describe the onset of centrifugal instability (and the corresponding growth rate) very accurately
Spectral nudging in regional climate modelling: How strongly should we nudge?

International audienceSpectral nudging is a technique consisting in driving regional climate models (RCMs) on selected spatial scales corresponding to those produced by the driving global circulation model (GCM). This technique prevents large and unrealistic departures between the GCM driving fields and the RCM fields at the GCM spatial scales. Theoretically, the relaxation of the RCM towards the GCM should be infinitely strong provided thre are perfect large-scale fields. In practice, the nudging time is chosen based on trial and error. In this study, the physical parameters setting the optimal nudging coefficient are identified and their effects are discussed. In addition to the predictability time t p, already analyzed in a companion article, the time interval t a between consecutive GCM driving fields is a key controlling parameter, especially when spectral nudging is considered. Indeed, the driving GCM fields are interpolated in time at every RCM integration time step, which is much smaller than t a. This produces an inaccurate evolution of the GCM fields. A nudging time close to zero (infinitly strong nudging) would thus produce a non-realistic evolution of the RCM large-scale field and consequently an inaccurate small-scale field. The optimum nudging coefficient thus differs from zero, but remains smaller than the predictability time t p, as discussed elsewhere. Furthermore depending on the time interval t a, all scales present in the driving fields may not be well time-resolved. It can then be beneficial to filter them out rather than driving the RCM with fields affected by time-sampling errors. © 2012 Royal Meteorological Society
Automatic Synthesis of Parsers and Validation of Bitstreams Within the MPEG Reconfigurable Video Coding Framework

International audienceVideo coding technology has evolved in the past years into a variety of different and complex algorithms. So far the specifications of such standard algorithms have been done case by case, providing monolithic textual and reference software specifications, but without paying any attention to the possibility of further improvements of such monolithic standards. The MPEG Reconfigurable Video Coding (RVC) framework is a new ISO/IEC standard, currently under its final stage of development aiming at providing video codec specifications at the level of coding tools instead of monolithic descriptions. The possibility to select a subset of standard video coding algorithms to specify a decoder that satisfies application specific constraints is very attractive. However, such possibility to reconfigure codecs requires systematic procedures and tools capable of describing the new bitstream syntaxes of such new codecs. Moreover, it becomes also necessary to generate the associated parsers, capable of parsing the new bitstreams. This paper further explains the problem and describes the technologies used to describe new bitstream syntaxes. Additionally, the paper describes the methodologies and the tools for the validation of bitstream syntaxes descriptions as well as a systematic procedure for automatically synthesizing parsers from the bitstream descriptions
Channel estimation and transmit power control in wireless body area networks

Wireless body area networks have recently received much attention because of their application to assisted living and remote patient monitoring. For these applications, energy minimisation is a critical issue since, in many cases, batteries cannot be easily replaced or recharged. Reducing energy expenditure by avoiding unnecessary high transmission power and minimising frame retransmissions is therefore crucial. In this study, a transmit power control scheme suitable for IEEE 802.15.6 networks operating in beacon mode with superframe boundaries is proposed. The transmission power is modulated, frame-by-frame, according to a run-time estimation of the channel conditions. Power measurements using the beacon frames are made periodically, providing reverse channel gain and an opportunistic fade margin, set on the basis of prior power fluctuations, is added. This approach allows tracking of the highly variable on-body to on-body propagation channel without the need to transmit additional probe frames. An experimental study based on test cases demonstrates the effectiveness of the scheme and compares its performance with alternative solutions presented in the literature
Band gap engineering, band edge emission, and p-type conductivity in wide-gap LaCuOS1–xSex oxychalcogenides

The preparation of LaCuOS1–xSex solid solutions (x = 0.0, 0.25, 0.5, 0.75, and 1.0) was attempted to control their energy gap and band edge emission energy. X-ray diffraction analysis revealed that the lattice constant of LaCuOS1–xSex increased linearly with increasing x, indicating the formation of a complete solid solution in the LaCuOS–LaCuOSe system. The energy gap estimated from the diffuse reflectance spectra varied continuously from ~3.1 eV for x = 0 to ~2.8 eV for x = 1. The sharp emission near the absorption edge was observed in all samples at room temperature under ultraviolet light irradiation. p-type electrical conduction in these materials was confirmed by Seebeck measurements, and the conductivity was enhanced by substitution of Sr for La. These results demonstrated that the formation of the solid solutions enabled band gap engineering in LaCuOS1–xSex oxychalcogenides keeping their band edge emission feature and p-type conductivity
Psychiatric disorder and cognitive function in children with epilepsy in Kerala, South India

The cognitive and psychiatric associations of childhood epilepsy have not been studied in developing countries. Children with epilepsy were identified during a population-based epidemiological study of 1403 8- to 12 year-old children in Kerala, South India. They were compared with age-, sex- and social class matched controls on measures of reading, vocabulary, non verbal reasoning and school performance. In addition, psychiatric symptoms were measured using standard questionnaires and the presence or absence of psychiatric disorder was established by interview. Patients performed as well as controls on the non-verbal test, but performed worse on tests of vocabulary and reading, suggesting a specific disadvantage in the area of education. Psychiatric disorder was more prevalent in the children with epilepsy. It was concluded that epilepsy in the population studied is accompanied by a significant burden of cognitive and psychiatric disorders which need recognition and adequate service provision
Fingerprints of different interaction mechanisms on the collective modes
  in complex (dusty) plasmas

In this paper we discuss the relations between the exact shape of
interparticle interactions in complex (dusty) plasmas and the dispersion
relation of the longitudinal collective mode. Several representative repulsive
potentials, predicted previously theoretically, are chosen and the
corresponding dispersion relations are calculated using the quasi-crystalline
approximation. Both weakly coupled and strongly coupled regimes are considered.
It is shown that the long-wavelength portions of the dispersion relations are
sensitive to the long-range asymptote of the interaction potential. This can be
used to discriminate between different interaction mechanisms operational in
complex plasmas experimentally. Main requirements are briefly discussed
Adaptive coatings based on polyaniline for direct 2d observation of diffusion processes in microfluidic systems

Microfluidic devices are poised to dramatically influence the future of the process industry. Therefore the understanding and proper evaluation of the flow and mixing behaviour at microscale becomes a very important issue. In this study, the diffusion behaviour of two reacting solutions of HCl and NaOH were directly observed in a glass/polydimethylsiloxane microfluidic device using adaptive coatings based on the conductive polymer polyaniline that are covalently attached to the microchannel walls. The two liquid streams were combined at the junction of a Y-shaped microchannel, and allowed to diffuse into each other and react. The results showed excellent correlation between optical observation of the diffusion process and the numerical results. A numerical model which is based on finite volume method (FVM) discretization of steady Navier-Stokes (fluid flow) equations and mass transport equations without reactions was used to calculate the flow variables at discrete points in the finite volume mesh element. The high correlation between theory and practical data indicates the potential of such coatings to monitor diffusion processes and mixing behaviour inside microfluidic channels in a dye free environment
Peptide bond formation through gas-phase reactions in the interstellar medium: Formamide and acetamide as prototypes

Producción CientíficaA theoretical study of the reactions of NH+4 with formaldehyde and CH+5 with formamide is carried out. The viability of these gas-phase ion–molecule reactions as possible sources of formamide and acetamide under the conditions of interstellar medium is evaluated. We report a theoretical estimation of the reaction enthalpies and an analysis of their potential energy surfaces. Formation of protonated formamide from the reaction between ammonium cation and formaldehyde is an exothermic process, but all the channels located on the potential energy surface leading to this product present net activation energies. For the reaction between methanium and formamide, different products are possible from a thermodynamic point of view. An analysis of its potential energy surface showed that formation of protonated acetamide and amino acetaldehyde takes place through barrier-free paths. Therefore, this reaction could be a feasible source of acetamide and amino acetaldehyde in spaceJunta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA330U13
Geographic distribution at subspecies resolution level: closely related Rhodopirellula species in European coastal sediments.

Members of the marine genus Rhodopirellula are attached living bacteria and studies based on cultured Rhodopirellula strains suggested that three closely related species R. baltica, 'R. europaea' and 'R. islandica' have a limited geographic distribution in Europe. To address this hypothesis, we developed a nested PCR for a single gene copy detection of a partial acetyl CoA synthetase (acsA) from intertidal sediments collected all around Europe. Furthermore, we performed growth experiments in a range of temperature, salinity and light conditions. A combination of Basic Local Alignment Search Tool (BLAST) and Minimum Entropy Decomposition (MED) was used to analyze the sequences with the aim to explore the geographical distribution of the species and subspecies. MED has been mainly used for the analysis of the 16S rRNA gene and here we propose a protocol for the analysis of protein-coding genes taking into account the degeneracy of the codons and a possible overestimation of functional diversity. The high-resolution analysis revealed differences in the intraspecies community structure in different geographic regions. However, we found all three species present in all regions sampled and in agreement with growth experiments we demonstrated that Rhodopirellula species do not have a limited geographic distribution in Europe
Security for all, development for some? The incorporation of security in UK development policy

This paper builds on existing research on the merging of development and security following 9/11. Whilst much of the current literature focuses on the development policy of the US, this paper examines the UK. Investigating arguments that the UK's coordination of security and development policy is concerned with security at home rather than in the developing world, the policy discourse of the UK's Department for International Development (DfID), Foreign and Commonwealth Office (FCO) and Ministry of Defence (MoD) is examined through its major policy documents for the period from the late 1990s to 2011. Two levels of analysis are used; a content analysis and a discourse analysis. In addition, this research draws on interviews with key informants within DfID. This paper argues that since 9/11 and the War on Terror, the UK has increasingly coordinated its foreign policy, development and security actors. As a result, DfID has given progressively greater attention to issues of national security in its policy discourse. This action is justified through a series of claims of common interest between actors across government and between the interests of developing countries and the UK. This merging of interests opens up space for development to be focused on ensuring UK national security. Whilst drawing on a paradigm of broader security, this instead reverses the principal of human security where national security is now a development problem
Aged-engineered nanoparticles effect on sludge anaerobic digestion performance and associated microbial communities

© 2017 The Authors To investigate the potential effect of aged engineered nanoparticles (a-ENPs) on sludge digestion performance, 150 L pilot anaerobic digesters (AD) were fed with a blend of primary and waste activated sludge spiked either with a mixture of silver oxide, titanium dioxide and zinc oxide or a mixture of their equivalent bulk metal salts to achieve a target concentration of 250, 2000, and 2800 mg kg− 1 dry weight, respectively. Volatile fatty acids (VFA) were 1.2 times higher in the spiked digesters and significantly different (p = 0.05) from the control conditions. Specifically, isovaleric acid concentration was 2 times lower in the control digester compared to the spiked digesters, whereas hydrogen sulfide was 2 times lower in the ENPs spiked digester indicating inhibitory effect on sulfate reducing microorganisms. Based on the ether-linked isoprenoids concentration, the total abundance of methanogens was 1.4 times lower in the ENPs spiked digester than in the control and metal salt spiked digesters. Pyrosequencing indicated 80% decrease in abundance and diversity of methanogens in ENPs spiked digester compared to the control digester. Methanosarcina acetivorans and Methanosarcina barkeri were identified as nano-tolerant as their relative abundance increased by a factor of 6 and 11, respectively, compared to the other digesters. The results further provide compelling evidence on the resilience of Fusobacteria, Actinobacteria and the Trojan horse-like effect of ENPs which offered a competitive advantage to some organisms while reducing microbial abundance and diversity
Dynamics of digging in wet soil

Numerous animals live in, and locomote through, subsea soils. To move in a medium dominated by frictional interactions, many of these animals have adopted unique burrowing strategies. This paper presents a burrowing model inspired by the Atlantic razor clam (Ensis directus), which uses deformations of its body to cyclically loosen and re-pack the surrounding soil in order to locally manipulate burrowing drag. The model reveals how an anisotropic body – composed of a cylinder and sphere varying sinusoidally in size and relative displacement – achieves unidirectional motion through a medium with variable frictional properties. This net displacement is attained even though the body kinematics are reciprocal and inertia of both the model organism and the surrounding medium are negligible. Our results indicate that body aspect ratio has a strong effect on burrowing velocity and efficiency, with a well-defined maximum for given kinematics and soil material properties
Why are behaviors of children suffering from various neuronopathic types of mucopolysaccharidoses different?

Mucopolysaccharidoses (MPS) are inherited metabolic disorders from the group of lysosomal storage diseases\ud
(LSD). They arise from mutations causing dysfunction of one of enzymes involved in degradation of\ud
glycosaminoglycans (GAGs) in lysosomes. Impaired degradation of these compounds results in their\ud
accumulation in cells and dysfunction of most tissues and organs of patients. If heparan sulfate (HS) is\ud
the sole or one of stored GAGs, brain functions are also affected. However, despite the fact that products\ud
of incomplete degradation of the same chemical, HS, are accumulated in brains of patients suffering from\ud
Hurler disease (MPS type I), Hunter disease (MPS type II), Sanfilippo disease (MPS type III) and Sly disease\ud
(MPS type VII), and obvious deterioration of brain functions occur in these patients, their behavior is considerably\ud
different between various types of MPS. Here we asked the question about biochemical reasons\ud
of these differences. We performed theoretical analysis of products of incomplete HS degradation that\ud
accumulate in tissues of patients diagnosed for these diseases. A correlation between chemical structures\ud
of incompletely degraded HS and behaviors of patients suffering from particular MPS types was found.\ud
We propose a hypothesis that particular chemical moieties occurring at the ends of incompletely\ud
degraded HS molecules may determine characteristic behavioral disturbances, perhaps due to chemical\ud
reactions interfering with functions of neurons in the brain. A possible experimental testing of this\ud
hypothesis is also proposed. If the hypothesis is true, it might shed some new light on biochemical mechanisms\ud
of behavioral problems occurring not only in MPS but also in some other diseases
Cathodoluminescence study of ZnO wafers cut from hydrothermal crystals

ZnO is a wide bandgap semiconductor with very promising expectation for UV optoelectronics. The existence of large crystals should allow homoepitaxial growth of ZnO films for advanced optoelectronic devices. However, the ZnO substrates are not yet mature. Both defect induced by growth and by polishing together with the high reactivity of the surface are problems to their industrial application. Cathodoluminescence (CL) was used to probe the quality of substrates from two different suppliers. The surface damage was studied by varying the penetration depth of the electron beam, allowing to observe significant differences between the two samples within a 0.5-mm-thick surface layer. CL spectra show a complex band (P1) at _3.3 eV composed of two overlapped bands (3.31 and 3.29 eV) related to point defects (PD) and the 1-LO phonon replica of the free exciton (FX-1LO). This band (P1) is shown to be very sensitive to the presence of defects and the surface and thermal treatments. Its intensity compared with the excitonic band intensity is demonstrated to provide criteria about the quality of the substrates
Developmental and pathogen-induced expression of three barley genes encoding lipid transfer proteins

Clones for three barley non-specific lipid transfer proteins (LTP2, LTP3, and LTP4; formerly Cw18, Cw20 and Cw21, respectively) which had been previously shown to inhibit growth of plant pathogens, were selected and characterized from a cDNA library derived from young etiolated leaves. Genes Ltp2 and Ltp4 were located in chromosome 3H and gene Ltp3 was assigned to chromosome 7H by Southern blot analysis of wheat—barley disomic addition lines, using gene-specific probes (3′-ends of cDNAs). These assignments were confirmed by the polymerase chain reaction, using specific primers. The three genes were expressed in stem, shoot apex, leaves and roots (at low levels) throughout development. Genes Ltp3 and Ltp4 were expressed at high levels, and Lpt2 at low levels, in the spike (rachis, lemma plus palea and grain coats). Neither of the mRNAs was detected in endosperm. The proteins were localized by tissue-printing with polyclonal antibodies in the outer cell layer of the exposed surfaces of the plant, throughout the embryo, and in vascular tissues. Expression levels in leaves were moderately increased by 0.34 M NaCl and by 0.1 mM abscisic acid and were not affected by cold, drought, salicylate, 2,6-dichloro-isonicotinic acid, ethylene or ethephon. Methyl Jasmonate (10 µM) switched off all three genes. Inoculation with Av6 or vir6 isolates of the fungal pathogen Erysiphe graminis increased the three mRNAs, especially that of LTP4, which reached a maximum nine-fold increase 12–16 h after infectio