pinecone/core-2020-05-10-deduplication huggingface dataset:
A means-ends design of SCRUM+: an agile-disciplined balanced SCRUM enhanced with the ISO/IEC 29110 Standard

Agile systems development methodologies (ASDMs) have gained high acceptance in very small entities (VSEs) of software development seeking quality at minimal effort. SCRUM and XP in industrial settings and UPEDU in academic ones are main of them. Similarly, Software Process Improvement (SPI) initiatives promote the utilization of process frameworks and standards. However, despite both worlds (i.e. ASDMs and SPI) pursue a shared end of high-quality software, both are separated by different underlying approaches. We consider that ASDMs can get benefits from SPI through controlled enhancements (i.e. an agile-discipline balance) without elimination of agility. Thus, in this research, we report the design of SCRUM+, an enhanced SCRUM with recommendations on roles, activities-tasks and artifacts from the SPI standard ISO/IEC 29110. SCRUM+ was designed by using a Means-Ends analysis. Our final aim is to provide such an enhanced SCRUM methodology via an Electronic Process Guide (EPG) to help practitioners for a better use of agile approaches with SPI added recommendations that be found theoretically robust and potentially useful regarding SCRUM from a panel of experts and SCRUM practitioners
A Visibility and Spatial Constraint-Based Approach for Geopositioning

Over the past decade, automated systems dedicated to geopositioning have been the object of considerable development. Despite the success of these systems for many applications, they cannot be directly applied to qualitative descriptions of space. The research presented in this paper introduces a visibility and constraintbased approach whose objective is to locate an observer from the verbal description of his/her surroundings. The geopositioning process is formally supported by a constraint-satisfaction algorithm. Preliminary experiments are applied to the description of environmental scenes
Numerical simulation of retention and release of colloids in porous media at the pore scale

Transport of a solid colloidal particle was simulated at the pore scale in presence of surface roughness and particle/pore physicochemical interaction by adopting a “one fluid” approach. A code developed in our laboratory was used to solve equations of motion, while implementing additional modules in order to take into account lubrication and physicochemical forces. Particles were recognized through a phase indicator function and the particle/fluid interface position at each instant was obtained by solving a transport equation. Roughnesses of different shapes were considered and the magnitude of the particle/pore physicochemical interaction was monitored through the change of the ionic strength of the suspending fluid. We first show that if pore surface is smooth no retention of the transported particle occurs whether the particle/pore surface is attractive or repulsive. However for shape roughnesses of “peak” or “valley”, particles may be retained inside pores or not depending on the considered ionic strength. In absence of particle retention, the residence time (the time needed for a particle to travel a characteristic pore distance) is finite and was found to be an increasing function of ionic strength for every considered roughness at fixed hydrodynamic conditions
Synthesis of poly(ethyl acrylate) by single electron transfer-degenerative chain transfer living radical polymerization in water catalyzed by Na2S2O4

Living radical polymerization of ethyl acrylate was achieved by single-electron-transfer/degenerative-chain transfer mediated living radical polymerization in water catalyzed by sodium dithionite. The plots of number-average molecular weight versus conversion and ln[M]0/[M] versus time are linear, indicating a controlled polymerization. This method leads to the preparation of alpha,omega-di(iodo)poly(ethyl acrylate) (alpha,omega-di(iodo)PEtA) macroinitiator that can be further functionalized. The molecular weight distributions were determined using a combination of three detectors (TriSEC): right-angle light scattering, a differential viscometer and refractive index. The method studied in this work represents a possible route to prepare well-tailored macromolecules made of ethyl acrylate in environmental friendly reaction medium. To the best of our knowledge there is no previous report dealing with the synthesis of PEtA by any LRP approach in aqueous medium. Furthermore, the method described in this article was successfully applied in pilot scale reactions under industrial production conditions. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 421-432, 2008http://dx.doi.org/10.1002/pola.2239
Pollution of Water and Stream Sediments Associated with the Vale De Abrutiga Uranium Mine, Central Portugal

The Vale de Abrutiga uranium deposit, located in Central Portugal near the Aguieira dam reservoir, was surface mined. Low-grade ore and waste rock were deposited on permeable ground, close to the mine, and were not revegetated. A lake has formed in the open pit. Surface waters draining the mine site are acidic, have high conductivity, and high concentrations of U, SO42-, Zn, Fe, Mn, Ra, Cu, Th, and Pb. The groundwater and the water from the reservoir cannot be used for human consumption or irrigation. The sampled waters show higher contaminant concentrations in winter than in summer. Stream sediments have high geoaccumulation indices for U, Fe, Ag, Zn, Cr, Co, and Pb. In general, sediments bordering the dam reservoir have higher metal contents in winter than in summer.http://dx.doi.org/10.1007/s10230-004-0041-
The fish assemblage of the Mondego estuary: composition, structure and trends over the past two decades

Abstract  The fish assemblage of the Mondego estuary was studied from June 2003 to May 2004. Five areas with different environmental conditions were sampled monthly, using a 2 m beam trawl (5 mm mesh size at the cod end). To complement information, sampling was also performed, seasonally, using a 7 m otter trawl with a 10 mm mesh size. Thirty-two species were identified. Dicentrarchus labrax, Pomatoschistus microps, Pomatoschistus minutus, Solea solea, Platichthys flesus and Diplodus vulgaris were the most abundant species. Marine juvenile migrants had the highest number of species, thirteen, followed by estuarine residents with eight species. Marine species that use the estuary as nursery grounds were the most abundant in terms of density and biomass. In spring and summer, juveniles occur in the upper, oligohaline areas, but afterwards, in autumn and winter, they tend to disperse to the middle and lower areas, with higher marine influence. Comparing the results obtained in this study with those reported in the early 1990’s, a marked decrease in species richness can be noticed, which is probably due to anthropogenic factors, namely an increase in depth of the main channel and intense euthrophication processes in the middle and upper areas.http://dx.doi.org/10.1007/s10750-007-0688-
Superconvergence of Piecewise Linear Semi-Discretizations for Parabolic Equations with Nonuniform Triangulations

In this paper we study the convergence properties of semi-discrete approximations for parabolic problems defined on two dimensional polygonal domains. These approximations are constructed using a nonstandard piecewise linear finite element method based on nonuniform triangulations of the domain and considering a variational formulation with a sesquilinear form which can be no strongly coercive. In order to increase accuracy a post-process procedure is studied.http://dx.doi.org/10.1007/s00021-005-0153-
Same sign di-lepton candles of the composite gluons

Composite Higgs models, where the Higgs boson is identified with the pseudo-Nambu-Goldstone-Boson (pNGB) of a strong sector, typically have light composite fermions (top partners) to account for a light Higgs. This type of models, generically also predicts the existence of heavy vector fields (composite gluons) which appear as an octet of QCD. These composite gluons become very broad resonances once phase-space allows them to decay into two composite fermions. This makes their traditional experimental searches, which are designed to look for narrow resonances, quite ineffective. In this paper, we as an alternative, propose to utilize the impact of composite gluons on the production of top partners to constrain their parameter space. We place constraints on the parameters of the composite resonances using the 8 TeV LHC data and also assess the reach of the 14 TeV LHC. We find that the high luminosity LHC will be able to probe composite gluon masses up to similar to 6 TeV, even in the broad resonance regime
Robust pedestrian detection and tracking in crowded scenes

In this paper, a robust computer vision approach to detecting and tracking pedestrians in unconstrained crowded scenes is presented. Pedestrian detection is performed via a 3D clustering process within a region-growing framework. The clustering process avoids using hard thresholds by using bio-metrically inspired constraints and a number of plan view statistics. Pedestrian tracking is achieved by formulating the track matching process as a weighted bipartite graph and using a Weighted Maximum Cardinality Matching scheme. The approach is evaluated using both indoor and outdoor sequences, captured using a variety of different camera placements and orientations, that feature significant challenges in terms of the number of pedestrians present, their interactions and scene lighting conditions. The evaluation is performed against a manually generated groundtruth for all sequences. Results point to the extremely accurate performance of the proposed approach in all cases
The DCU laser ion source

Laser ion sources are used to generate and deliver highly charged ions of various masses and energies. We present details on the design and basic parameters of the DCU laser ion source (LIS). The theoretical aspects of a high voltage (HV) linear LIS are presented and the main issues surrounding laser-plasma formation, ion extraction and modeling of beam transport in relation to the operation of a LIS are detailed. A range of laser power densities (I ∼ 108–1011 W cm−2) and fluences (F = 0.1–3.9 kJ cm−2) from a Q-switched ruby laser (full-width half-maximum pulse duration ∼ 35 ns, λ = 694 nm) were used to generate a copper plasma. In “basic operating mode,” laser generated plasma ions are electrostatically accelerated using a dc HV bias (5–18 kV). A traditional einzel electrostatic lens system is utilized to transport and collimate the extracted ion beam for detection via a Faraday cup. Peak currents of up to I ∼ 600 μA for Cu+ to Cu3+ ions were recorded. The maximum collected charge reached 94 pC (Cu2+). Hydrodynamic simulations and ion probe diagnostics were used to study the plasma plume within the extraction gap. The system measured performance and electrodynamic simulations indicated that the use of a short field-free (L = 48 mm) region results in rapid expansion of the injected ion beam in the drift tube. This severely limits the efficiency of the electrostatic lens system and consequently the sources performance. Simulations of ion beam dynamics in a “continuous einzel array” were performed and experimentally verified to counter the strong space-charge force present in the ion beam which results from plasma extraction close to the target surface. Ion beam acceleration and injection thus occur at “high pressure.” In “enhanced operating mode,” peak currents of 3.26 mA (Cu2+) were recorded. The collected currents of more highly charged ions (Cu4+–Cu6+) increased considerably in this mode of operation
Physical integrity of 3D printed parts for use as embossing tools

On inception, 3D printed parts were typically used at prototyping stage to give the end user/customer a real world concept of how the part may appear when traditional manufacturing techniques were employed for final part fabrication. In this context, mechanical properties such as load bearing capacity or wear rate were not typically of primary concern. This paper investigates, given the advances in 3D printing technology, the potential for using 3D printed parts for high throughput embossing tools. The key mechanical properties for embossing tools are compression and wear rate. To this end, commercially available engineering grade photopolymer materials were characterised in terms of compression and wear using ASTM D695 and ASTM G99 standards respectively. Parts were fabricated via the Polyjet ink-jetting 3D printing technique using the commercially available Connex 260 from Stratasys. Given the nature of the fabrication technique, differences in compressive strength of the material based on orientation of build were also investigated
Exploring knowledge loss in open source software (OSS) projects

Open Source Software is a term used to identify software developed and released under an “open source” license, meaning that under certain conditions; it is openly available for use, inspection, modification, and for redistribution free of cost (or with cost based on the license agreement). Incorporation of OSS while developing software can reduce time and cost of development. The nature of the work force (volunteers and paid) in OSS projects is transient and results in high turnover leading to knowledge loss. In this work, we explore the phenomenon of knowledge loss in OSS projects. Maintenance of OSS projects requires knowledge, typically shared asynchronously using technology-mediated channels. Knowledge sought in this manner is reactive in the sense that a developer will consult these channels looking for possible solutions or supporting information. We follow the backward snowballing to study the relevant literature on knowledge loss in OSS. Our work suggests that proactive knowledge exchange mechanisms may bring some benefits to OSS projects. Further integration of knowledge management practices with the established OSS practices can minimise knowledge loss
Automatic Inference of Determinacy and Mutual Exclusion\ud
for Logic Programs Using Mode and Type Analyses

We propose an analysis for detecting procedures and goals\ud
that are deterministic (i.e., that produce at most one solution at most once),or predicates whose clause tests are mutually exclusive (which implies that at most one of their clauses will succeed) even if they are not deterministic.\ud
The analysis takes advantage of the pruning operator in order to improve the detection of mutual exclusion and determinacy. It also supports arithmetic equations and disequations, as well as equations and disequations on terms,for which we give a complete satisfiability testing algorithm, w.r.t. available type information. Information about determinacy can be used for program debugging and optimization, resource consumption and granularity control,\ud
abstraction carrying code, etc. We have implemented the analysis and integrated it in the CiaoPP system, which also infers automatically the mode and type information that our analysis takes as input. Experiments performed on this implementation show that the analysis is fairly accurate and efficient
Managing software development information in global configuration management activities

Software Configuration Management (SCM) techniques have been considered the entry point to rigorous software engineering, where multiple organizations cooperate in a decentralized mode to save resources, ensure the quality of the diversity of software products, and manage corporate information to get a better return of investment. The incessant trend of Global Software Development (GSD) and the complexity of implementing a correct SCM solution grow not only because of the changing circumstances, but also because of the interactions and the forces related to GSD activities. This paper addresses the role SCM plays in the development of commercial products and systems, and introduces a SCM reference model to describe the relationships between the different technical, organizational, and product concerns any software development company should support in the global market
Methodological guidelines for reusing general ontologies

Currently, there is a great deal of well-founded explicit knowledge formalizing general notions, such as time concepts and the part_of relation. Yet, it is often the case that instead of reusing ontologies that implement such notions (the so-called general ontologies), engineers create procedural programs that implicitly implement this knowledge. They do not save time and code by reusing explicit knowledge, and devote effort to solve problems that other people have already adequately solved. Consequently, we have developed a methodology that helps engineers to: (a) identify the type of general ontology to be reused; (b) find out which axioms and definitions should be reused; (c) make a decision, using formal concept analysis, on what general ontology is going to be reused; and (d) adapt and integrate the selected general ontology in the domain ontology to be developed. To illustrate our approach we have employed use-cases. For each use case, we provide a set of heuristics with examples. Each of these heuristics has been tested in either OWL or Prolog. Our methodology has been applied to develop a pharmaceutical product ontology. Additionally, we have carried out a controlled experiment with graduated students doing a MCs in Artificial Intelligence. This experiment has yielded some interesting findings concerning what kind of features the future extensions of the methodology should have
Light-Emitting-Diodes based on ordered InGaN nanocolumns emitting in the blue, green and yellow spectral range

The growth of ordered arrays of InGaN/GaN nanocolumnar light emitting diodes by molecular beam epitaxy, emitting in the blue (441 nm), green (502 nm), and yellow (568 nm) spectral range is reported. The device active region, consisting of a nanocolumnar InGaN section of nominally constant composition and 250 to 500 nm length, is free of extended defects, which is in strong contrast to InGaN layers (planar) of similar composition and thickness. The devices are driven under pulsed operation up to 1300 A/cm2 without traces of efficiency droop. Electroluminescence spectra show a very small blue shift with increasing current, (almost negligible in the yellow device) and line widths slightly broader than those of state-of-the-art InGaN quantum wells
Nanometric multiscale rough Zn-ZnO superhydrophobic thin films: Self-diffusion of zinc and effect of UV irradiation

Zn–ZnO superhydrophobic thin films have been prepared by thermal oxidation of sputtered Zn. The superhydrophobicity observed in these coatings is attributed to multiscale roughness in the\ud
nanometric range only. The higher scale roughness was due to the combination of nanoclusters solid regions and air gaps while the lower scale roughness was due to the textured surface created by the fusion of individual ZnO nanocrystals to form the nanoclusters. The superhydrophobicity in these coatings has been observed only for an optimum combination of solid regions i.e., nanoclusters and air pockets. Experimental evidences have been provided to demonstrate that anadditional micron-scale roughness on the substrate does not affect the wettability of the coating. It has been observed that the wettability of the Zn–ZnO coatings changes from hydrophobic to superhydrophobic during the initial 24 h after deposition. This occurs due to the outward self-diffusion of Zn to the surface and its subsequent oxidation under ambient conditions. Field-emission scanning electron microscopy FESEM and atomic force microscopy AFM were used to demonstrate the morphological changes while micro-Raman spectroscopy was used to record the chemical changes on the coating surface as a result of the outward diffusion and subsequent oxidation of Zn. Studies have also been carried out to determine the effect of UV irradiation on the Zn–ZnO coatings. The UV irradiation transformed the Zn–ZnO surface from superhydrophobic to hydrophilic. Our studies based on FESEM, AFM, micro-Raman spectroscopy, and roughness profilometry show that this transformation was mainly due to the morphological changes that occur in addition to the chemical changes taking place on the ZnO surface under the influence of UV irradiation. The UV irradiation disturbs the optimum density of air pockets, leading to the loss of superhydrophobicity
The Virgo 3 km interferometer for gravitational wave detection

Virgo, designed, constructed and developed by the French-Italian VIRGO collaboration located in Cascina (Pisa, Italy) and aiming to detect gravitational waves, is a ground-based power recycled Michelson interferometer, with 3 km long suspended Fabry-Perot cavities. The first Virgo scientific data-taking started in mid-May 2007, in coincidence with the corresponding LIGO detectors. The optical scheme of the interferometer and the various optical techniques used in the experiment, such as the laser source, control, alignment, stabilization and detection strategies are outlined. The future upgrades that are planned for Virgo from the optical point of view, especially concerning the evolution of the Virgo laser, are presented. Finally, the next generation of the gravitational wave detector (advanced Virgo) is introduced from the point of view of the laser system
The structural disempowerment of Eastern European migrant farm workers in Norwegian agriculture

-Since the 2004 EU enlargement established one European common labour market, a large number of Eastern Europeans have taken up seasonal employment as hired farm workers in Norwegian agriculture. Much attention in the public has been given to the potential for ‘social dumping’ of these migrating workers, as they are considered prone to exploitation by farmers looking for cheap and docile labour, and subject to low-wages and poor labour conditions. In response to these threats, Norway implemented labour regulations (‘transitional rules’) that established minimum standards for wage levels and labour conditions, combined with registration and supervision of the incoming labour force. Nevertheless, reports from the field indicate that many of the westward migrating labour force experience work conditions that are far poorer than prescribed by the labour regulations, as these are not implemented at the farm level. In this paper, we discuss the social processes that result in this mismatch between state regulations (e.g. transition rules) and the actual experiences of migrant workers building on dual labour market theory. Analysing qualitative in-depth interviews with 54 farm migrants, we argue that there are two sets of factors underlying the poorer working conditions observed on the farms: Firstly, the structural disempowerment of migrant workers, which gives them weak negotiating positions vis-à-vis their employers (farmers); and secondly, the migrant workers' frame of reference for wage levels, in which poor payment levels by Norwegian standards are found acceptable or even good when judged by Eastern European wage levels. While a number of works have described the exploitation of farm migrant labour, we demonstrate in this paper how national immigration and agricultural histories, structures and present policies configure the labour–capital relations at farm level in the Norwegian case