bluuebunny/crossref_metadata_2025_split huggingface dataset:
Discovery of a New Fundamental Plane Dictating Galaxy Cluster Evolution from Gravitational Lensing
Authors: Fujita Yutaka , Umetsu Keiichi , Rasia Elena , Meneghetti Massimo , Donahue Megan , Medezinski Elinor , Okabe Nobuhiro , Postman Marc 
Published: April 2018

Abstract
In cold dark-matter (CDM) cosmology, objects in the universe have grown under the effect of gravity of dark matter. The intracluster gas in a galaxy cluster was heated when the dark-matter halo formed through gravitational collapse. The potential energy of the gas was converted to thermal energy through this process. However, this process and the thermodynamic history of the gas have not been clearly characterized in connection with the formation and evolution of the internal structure of dark-matter halos. Here, we show that observational CLASH data of high-mass galaxy clusters lie on a plane in the three-dimensional logarithmic space of their characteristic radius r

s
, mass M

s
, and X-ray temperature T
X with a very small orthogonal scatter. The tight correlation indicates that the gas temperature was determined at a specific cluster formation time, which is encoded in r

s
and M

s
. The plane is tilted with respect to T
X ∝ M

s
/r

s
, which is the plane expected in the case of simplified virial equilibrium. We show that this tilt can be explained by a similarity solution, which indicates that clusters are not isolated but continuously growing through matter accretion from their outer environments. Numerical simulations reproduce the observed plane and its angle. This result holds independently of the gas physics implemented in the code, revealing the fundamental origin of this plane.
Asymmetry of Line Profiles of Stellar Oscillations Measured by Kepler for Ensembles of Solar-like Oscillators: Impact on Mode Frequencies and Dependence on Effective Temperature
Authors: Benomar O. , Goupil Mjo. , Belkacem K. , Appourchaux T. , Nielsen M. B. , Bazot M. , Gizon L. , Hanasoge S. , Sreenivasan K. R. , Marchand B. 
Published: April 2018

Abstract
Oscillation properties are usually measured by fitting symmetric Lorentzian profiles to the power spectra of Sun-like stars. However, the line profiles of solar oscillations have been observed to be asymmetrical for the Sun. The physical origin of this line asymmetry is not fully understood; though, it should depend on the depth dependence of the source of wave excitation (convective turbulence) and details of the observable (velocity or intensity). For oscillations of the Sun, it has been shown that neglecting the asymmetry leads to systematic errors in the frequency determination. This could subsequently affect the results of seismic inferences of the solar internal structure. Using light curves from the Kepler spacecraft, we have measured mode asymmetries in 43 stars. We confirm that neglecting the asymmetry leads to systematic errors that can exceed the 1σ confidence intervals for seismic observations longer than one year. Therefore, the application of an asymmetric Lorentzian profile should be favored to improve the accuracy of the internal stellar structure and stellar fundamental parameters. We also show that the asymmetry changes sign between cool Sun-like stars and hotter stars. This provides the best constraints to date on the location of the excitation sources across the Hertzsprung–Russel diagram.
New European records of Ditomyia macroptera Winnertz (Diptera: Ditomyiidae) with notes on its distribution
Authors: Kurina Olavi , Chandler Peter 
Published: April 2018

Ditomyia macroptera Winnertz, the rarest European ditomyiid fly, is known only by a few specimens across the collections. Besides a single male specimen from Sakhalin Island, all other documented records are from Central Europe.
New records of Ditomyia macroptera Winnertz from Bulgaria and France are presented representing the second rearing event after its initial description. Illustrations of the general facies and male terminalia are given. The study of old collection material reveals exclusion of the species from the Belgian list and allows us to discuss the origin of two specimens in the collection of C.R. Osten-Sacken in St. Petersburg, Russia.
Les besoins en informations dans les entreprises
Authors: Tchouassi Gérard 
Published: April 2018

L’objectif de cette contribution est d’analyser les besoins en information dans les entreprises. Cette analyse s’effectue sous le prisme de l’intelligence économique, des systèmes d’aide à la décision, tout en valorisant les principaux canaux de circulation de l’information en entreprise. Les besoins en information sont de deux types : permanents et ponctuels. La définition des besoins en information conduit à une conception d’axes stratégiques de veille économique sur lesquels le dispositif de l’entreprise va se focaliser. Le système d’aide à la décision permet d’évaluer l’information qui provient de l’intérieur ou de l’extérieur de l’entreprise.
Filiations humaines, filiation divine
Authors: Lefebvre Philippe 
Published: April 2018

La Bible commence par affirmer que toute filiation vient de Dieu. Elle ne concerne pas seulement le « coup d’envoi » que représente la création des humains. Chaque humain se découvre en effet « façonné » par Dieu, voulu, prévu, annoncé. Comment dès lors penser les engendrements, les tôledôt , dont les déploiements fleurissent dans la Genèse notamment ? Paradoxalement, les stériles qui malgré tout enfantent donnent la norme de toute naissance humaine en mettant en lumière l’initiative divine. Mais entrer dans la filiation n’est ni un dû ni un acquis : un acquiescement est nécessaire, une disposition à cheminer. Femmes et hommes ne sont pas situés de la même manière sur l’« axe » de la filiation : les unes témoignent d’un Dieu Père, les autres ont à devenir fils-devant-Dieu.
Filiation et procréation dans l’éthique catholique
Authors: de Longeaux Jacques 
Published: April 2018

Le magistère de l’Église catholique a publié depuis cinquante ans plusieurs documents importants sur l’éthique de la procréation et de la filiation. Cet article tente de mettre en évidence les lignes de force de cet enseignement que l’on ne peut réduire à l’affirmation de la valeur normative des processus biologiques. La réflexion sur le corps, comme expression de la personne, lieu de la relation et épreuve du réel, occupe une place centrale, particulièrement dans la pensée de Jean-Paul II. Elle garde toute son actualité à notre époque où la question de la valeur de notre appartenance au monde des vivants se fait plus pressante. Est-il sage de vouloir à tout prix contourner les déterminations fondamentales de notre existence corporelle ?
L’essor des techniques de dépistage prénatal
Authors: Thiel Marie-Jo 
Published: April 2018

Le diagnostic prénatal né dans les années 1970 connaît aujourd’hui un développement dans son efficience, son extension et la complexité des données mobilisées. Il vient à englober des tests médicaux et génétiques réalisés à divers moments : le diagnostic préimplantatoire, le dépistage prénatal orienté dans lequel le DPNI (dépistage prénatal non invasif) ouvre potentiellement la voie à l’analyse de l’ensemble du génome de l’enfant à naître, et donc son éventuelle élimination pour non-conformité aux attentes (individuelles et sociétales). Insidieusement, la sélection s’élargit, interrogeant, en particulier dans le contexte socio-politique français (gratuité du suivi, confiance en la science), sur les pratiques mises en place, leur caractère discriminant, voire eugéniste (pour la trisomie 21).
Quand Pierre Mauroy résistait avec rigueur au « néolibéralisme » (1981-1984)
Authors: Fulla Mathieu 
Published: April 2018

Cet article interroge l’idée d’une conversion précoce et résolue des élites socialistes françaises aux charmes du néolibéralisme au début des années 1980. François Mitterrand endosserait-il les habits de Ronald Reagan en mars 1983, tandis que Pierre Mauroy ferait du néolibéralisme sans le savoir ? L’examen des archives de la présidence de la République et de Matignon révèle le caractère néolibéral extrêmement discret, pour ne pas dire introuvable, de la politique économique socialiste. Si entrée de la France dans une forme de néolibéralisme économique il y eut, celle-ci est bien davantage à chercher dans les politiques suivies par les gouvernements Fabius et Chirac que dans celles menées par Pierre Mauroy.
Le spectre de la crise financière française de 1983
Authors: Warlouzet Laurent 
Published: April 2018

Cet article revisite le « tournant de la rigueur » de mars 1983 grâce à de nouvelles archives ouest-européennes issues des gouvernements britanniques et allemands, de la Bundesbank, et de la Confédération européenne des syndicats. Il montre qu’un tournant véritable eut lieu en mars 1983 du fait du risque de crise financière, avec une possible intervention du Fonds monétaire international. La résolution de la crise a été essentiellement franco-allemande. Elle a permis une convergence des politiques économiques qui traduit moins un tournant néolibéral, que l’adoption de politiques de libre-marché perçues comme mieux adaptées au défi de la mondialisation, sans être incompatibles avec des politiques sociales.
Automated Model Building: The Next AI Frontier in Predictive Maintenance
Authors: Herve P. , Haddad G. , Moore K. , Rosner M. 
Published: April 2018

Predictive maintenance has become the paradigm of choice for the largest industrial companies because of the value it derives, including reduced downtime, improved efficiency, reduced maintenance costs, and others. Success of predictive maintenance programs is achieved when data, analytics, and subject matter expertise intersect. While data and subject matter expertise are always available, analytics talent is often lacking or facing numerous challenges which hinders the success of predictive maintenance programs.
Automated model building (AMB) aims at delivering artificial intelligence to the fingertips of industrial companies and hence ensuring the success of predictive maintenance programs without the need of large data science organizations.
The automated model building platform ingests the operational (sensor) and failure/fault data and automatically builds AI models to predict the remaining useful life for the asset. The patented technology behind the platform drives feature engineering and model selection which allows customers to automatically create numerous new variables from the sensor data and tests thousands of different models. The platform will then select the optimal set of variables and the model that will achieve the best performance.
The entire process can be performed in a matter of few minutes without the need to know the details of all AI models. The platform also gives details on the selected models, which aids with interpretability.
Numerical Modeling of High Length-to-Diameter Ratio Riser Subjected to VIV
Authors: Kara M. C. , Jaiswal V. , Sharma P. P. , Tulimilli B. , Cosgrove S. 
Published: April 2018

Abstract
Modeling of long marine risers subjected to VIV is a challenging problem to solve using 3D Computational Fluid Dynamics (CFD) due to the high length-to-diameter ratio and usage of different VIV suppression devices. The scale of the problem can also get extremely large as the risers may have lengths up to thousands of meters, which makes it hard to use 3D CFD simulations. However, CFD is unique to capture complex flow around bluff structures and able to model risers with and without suppression devices and involve effects of nonlinear structural response inherently.
ExxonMobil's high quality data on the behavior of high length-to-diameter ratio (L/D) risers subjected to vortex induced vibrations (VIV) in uniform and sheared flow (Marintek, 2003) exposes some of the physical details of full-scale riser response and compares the multi-mode VIV response of risers without suppression devices to that of risers with varying lengths of suppression coverage. In this paper, ExxonMobil data is investigated and validated using CFD code AcuSolveTM, which uses a strongly coupled numerical method that simultaneously solves fluid phase equations and structural equations of motion through modal analysis to predict the vibration response. Numerical simulations for high L/D bare riser response show that the method provides a good estimation of VIV responses in both in-line and crossflow directions by comparing numerical results against available field data.
Maximize EOR Potential by Optimizing Miscible CO2 Injection Parameters in Carbonate Reservoirs
Authors: Chen Peila , Kalam Mohammed Zubair , Al Kindi S A , Abolhag Yasser Hazem , Shtepani Edmond 
Published: April 2018

AbstractCO2 injection to improve oil recovery has been successfully implemented in many oil reservoirs worldwide for almost half century. Conventional CO2 injection strategies, such as continuous CO2 flooding, water-alternating-gas (WAG) or carbonated water injection (CWI), were usually studied for their technical viability and cost effectiveness before deployment. This paper aimed to optimize the parametric design of CO2 injection schemes in a carbonate reservoir, and evaluated the impacts of WAG slug size, WAG sequence, and the initial gas saturation (Sgi) on the incremental oil recovery factors.This paper presents the results from experimental and numerical studies on the different forms of CO2 floods. We compared the secondary and tertiary recovery modes, and studied the effects of initial gas saturation on EOR performance, through a series of core flood experiments under reservoir conditions and detailed compositional simulation in a commercial simulator.The EOR core flood experiments were performed in a 2-ft long composite of carbonate cores, which were restored to reservoir wettability at reservoir conditions. The experiment indicates that carbonated water injection (CWI) in tertiary mode renders additional oil recovery ~ 20% OOIP above the waterflood (42% OOIP). In the cases of zero initial gas saturation or the reservoir pressure is above the bubble point, all three forms of CO2 injection (i.e. CO2 continuous, CO2-brine WAG and Brine-CO2 WAG) achieved &gt; 93% OOIP recovery factor in the laboratory coreflood studies. If the reservoir was injected with produced/injector gas under immiscible conditions to support the reservoir pressure, the miscible gas EOR using CO2 WAG dropped by 10-15% OOIP compared with the corresponding cases of zero initial gas saturation. Therefore, it is recommended to implement miscible CO2 WAG flood after the initial gas saturation is minimized. Simulation studies with EOS model were carried out to simulate all of these EOR corefloods, taking into account of the effects of relative permeability hysteresis, wettability and Sorm (residual oil saturation) on oil recovery. The simulation results agree well with the laboratory results.In Summary, the presence of initial gas saturation in carbonate reservoirs reduces CO2 EOR performance under the miscible conditions. Without the presence of Sgi, the recovery factors from all the forms of CO2 EOR appear to be very similar in laboratory scale study. CWI was proved to be a good alternative to CO2 WAG, only when a significant amount of CWI is injected into the reservoir. These key findings have been validated by core flood experiments and compositional simulation studies with tuned EOS models.
AOGV: New Method for Process Isolation
Authors: Rosén Kenneth O. , Aamodt Kjetil , Mikkelsen Kurt 
Published: April 2018

Abstract
Inserting a positive isolation spade on live pipe flanges is a game changer. The purpose of the tool is to enable safe isolations and to reduce extent and duration of production shutdowns, adding value of 2-20 MUSD per application. The principle design was developed within the Company addressing shortcomings of traditional isolation methods. The tool is field proven on a platform on the NCS.
Plants have large volumes which require substantial preparation and start up activities in relation to performing maintenance operations. The isolation tool can shorten shut down periods significantly thereby reducing cost.
Typical applications may include replacement of valves and piping, isolate heat exchangers for chemical cleaning or replacing leaking flange gasket with new gaskets and bolts. The live isolation tool can turn the original spectacle blinds on live systems, replace elements connected to piping systems, floating hulls, connections to high volume tanks.
The tool can be installed on a pair of flanges at the maintenance location and significantly reduces the need for drainage, venting purging and flushing.
A field proven tool for live process isolation has been demonstrates as a safe and cost saving technology. The technology is patented and is significantly different from existing methods of line stopping. There is a wide range of application areas in Facilities and Production Operations and the new tool will increase plant uptime.
The case study is based on the first field application of the live isolation tool on a 24" flange without draining the inventory. No conventional isolation methods were feasible in this isolation case to facilitate chemical cleaning of a heat exchanger thereby sustaining uptime in a large process plant on major offshore platform NCS.
Wet Gas Production from a Semi-Submersible with On-Board Condensate Storage
Authors: Rijken Oriol 
Published: April 2018

Abstract
A semi-submersible is a field proven solution that allows for hydrocarbon production through steel catenary risers for locations subjected to very intense hurricane / cyclonic / typhoon conditions. The semi-submersible can be made applicable to a broader range of offshore fields if it is able to export a dry gas. The produced liquids – condensate – may be stored onboard the semi-submersible and be off-loaded via a shuttle tanker.
While at first sight a typical semi-submersible has ample room for storage of condensate, the storage and off-loading requirements introduce a whole new set of functional, regulatory and safety requirements to the system. Operator requirements and operator preferred practices impose additional requirements. In a sense, the semi-submersible with storage fulfills several of the functions also found on an FPSO, though volumetric quantities are much smaller, a range of 100,000 bbls to 150,000 bbls of storage is considered.
Regulatory requirements, such as set forth in IMO, MODU, MARPOL, Flag State and Class, are typically intended for oil tanker / FPSO application, and their applicability to semi-submersible can be ambiguous. Regulatory requirements to consider include double-hull requirement, whether unsegregated storage is allowed and the definition of Classified Spaces and confined spaces, whether hydrocarbon storage during (hurricane) abandonment is allowed, etc.
Whether to store the hydrocarbons separately or unsegregated is one of the most important decisions that affect the layout, geometry and thus cost of the semi-submersible. Also the off-load frequency, the off-load parcel size, and whether to allow for a varying draft or to maintain draft and compensate for the varying condensate payload, have a significant impact on the overall concept. The storage compartments inside the hull will have to be compatible with the hull framing and equipment already located inside the hull.
Producing wet gas into a dry gas and condensate is proven technology on a semi-submersible and FPSO. Analogous to the FPSO, the produced condensate is first kept in storage tanks and is then transferred to an off-loading vessel. The location of the offloading equipment and tank cleaning, as performed on an FPSO, are additional operational aspects be addressed. Above all, the marine crew on the semi-submersible will now have to be much more familiar with marine operations than what they are today.
This paper identifies and discusses the additional requirements that are the result of storing condensate (hydrocarbons) in the hull of a semi-submersible. Many of these requirements have a large impact on the design and operation of the semi-submersible. The paper indicates that a semi-submersible with condensate storage of 125,000 bbls is practical and a layout is provided at concept level.
Wind-Induced Fatigue of Onshore Frame Structures
Authors: Lee Won Ho , Malinowski Grzegorz , Szalewski Piotr 
Published: April 2018

Abstract
The paper presents a proposed methodology to evaluate wind-induced fatigue of onshore slender frame structures with lattice-type design. The methodology for fatigue evaluation is based on a similar offshore industry design practice and has been repurposed for large onshore structures fabricated from tubular pipes, square tubes, and angle bars exposed to wind loading, including wind buffeting loads and wind vortex shedding.
Multiple cracks resulting from wind-induced fatigue have been experienced on offshore installed flare booms and flare towers. Consequently, design codes were introduced, and it has been a standard design practice to evaluate potential fatigue damage of slender frame structures due to vibrations induced by vortex shedding, as well as buffeting loads due to gusting. This is, however, not yet standard design practice for land-based slender frame structures despite obvious similarities in terms of structural configuration, size, wind loads, and consequences of failure. Some operators have internal requirements to assess these operational risks.
In this study, wind-induced fatigue design and analysis methodologies have been developed and calibrated based on offshore design practices. The proposed methodology uses a spectral analysis method that considers wind data, and includes simplified design checks as well as advanced analysis approaches. Further comparisons are presented for structural configuration and various end connection types with relevant examples. Both welded and gusset-type bolted connection of tubular members are investigated. This paper provides designers with methodology guidance to calculate structural fatigue damage due to both wind buffeting loads and vortex shedding vibrations. Key design considerations for wind fatigue analysis, typical design solutions and recommendations for improvements of fatigue life, and practical ways for the global fatigue screening are also provided.