bluuebunny/crossref_metadata_2025_split huggingface dataset:
NIR-driven Moist Upper Atmospheres of Synchronously Rotating Temperate Terrestrial Exoplanets
Authors: Fujii Yuka , Del Genio Anthony D. , Amundsen David S. 
Published: October 2017

Abstract
H2O is a key molecule in characterizing atmospheres of temperate terrestrial planets, and observations of transmission spectra are expected to play a primary role in detecting its signatures in the near future. The detectability of H2O absorption features in transmission spectra depends on the abundance of water vapor in the upper part of the atmosphere. We study the three-dimensional distribution of atmospheric H2O for synchronously rotating Earth-sized aquaplanets using the general circulation model (GCM) ROCKE-3D, and examine the effects of total incident flux and stellar spectral type. We observe a more gentle increase of the water vapor mixing ratio in response to increased incident flux than one-dimensional models suggest, in qualitative agreement with the climate-stabilizing effect of clouds around the substellar point previously observed in GCMs applied to synchronously rotating planets. However, the water vapor mixing ratio in the upper atmosphere starts to increase while the surface temperature is still moderate. This is explained by the circulation in the upper atmosphere being driven by the radiative heating due to absorption by water vapor and cloud particles, causing efficient vertical transport of water vapor. Consistently, the water vapor mixing ratio is found to be well-correlated with the near-infrared portion of the incident flux. We also simulate transmission spectra based on the GCM outputs, and show that for the more highly irradiated planets, the H2O signatures may be strengthened by a factor of a few, loosening the observational demands for a H2O detection.
Apex Dips of Experimental Flux Ropes: Helix or Cusp?
Authors: Wongwaitayakornkul Pakorn , Haw Magnus A. , Li Hui , Li Shengtai , Bellan Paul M. 
Published: October 2017

Abstract
We present a new theory for the presence of apex dips in certain experimental flux ropes. Previously such dips were thought to be projections of a helical loop axis generated by the kink instability. However, new evidence from experiments and simulations suggest that the feature is a 2D cusp rather than a 3D helix. The proposed mechanism for cusp formation is a density pileup region generated by nonlinear interaction of neutral gas cones emitted from fast-gas nozzles. The results indicate that density perturbations can result in large distortions of an erupting flux rope, even in the absence of significant pressure or gravitational forces. The density pileup at the apex also suppresses the m = 1 kink mode by acting as a stationary node. Consequently, more accurate density profiles should be considered when attempting to model the stability and shape of solar and astrophysical flux ropes.
Star Formation in the Local Universe from the CALIFA Sample. II. Activation and Quenching Mechanisms in Bulges, Bars, and Disks
Authors: Catalán-Torrecilla C. , Gil de Paz A. , Castillo-Morales A. , Méndez-Abreu J. , Falcón-Barroso J. , Bekeraite S. , Costantin L. , Lorenzo-Cáceres A. de , Florido E. , García-Benito R. , Husemann B. , Iglesias-Páramo J. , Kennicutt R. C. , Mast D. , Pascual S. , Ruiz-Lara T. , Sánchez-Menguiano L. , Sánchez S. F. , Walcher C. J. , Bland-Hawthorn J. , Puertas S. Duarte , Marino R. A. , Masegosa J. , Sánchez-Blázquez P. ,   CALIFA Collaboration
Published: October 2017

Abstract
We estimate the current extinction-corrected Hα star formation rate (SFR) of the different morphological components that shape galaxies (bulges, bars, and disks). We use a multicomponent photometric decomposition based on Sloan Digital Sky Survey imaging to Calar Alto Legacy Integral Field Area Integral Field Spectroscopy (IFS) datacubes for a sample of 219 galaxies. This analysis reveals an enhancement of the central SFR and specific SFR (sSFR = SFR/M
⋆) in barred galaxies. Along the main sequence, we find that more massive galaxies in total have undergone efficient suppression (quenching) of their star formation, in agreement with many studies. We discover that more massive disks have had their star formation quenched as well. We evaluate which mechanisms might be responsible for this quenching process. The presence of type 2 AGNs plays a role at damping the sSFR in bulges and less efficiently in disks. Also, the decrease in the sSFR of the disk component becomes more noticeable for stellar masses around

for bulges, it is already present at

. The analysis of the line-of-sight stellar velocity dispersions (σ) for the bulge component and of the corresponding Faber–Jackson relation shows that AGNs tend to have slightly higher σ values than star-forming galaxies for the same mass. Finally, the impact of environment is evaluated by means of the projected galaxy density, Σ5. We find that the SFR of both bulges and disks decreases in intermediate- to high-density environments. This work reflects the potential of combining IFS data with 2D multicomponent decompositions to shed light on the processes that regulate the SFR.
A Tale of Two Impostors: SN2002kg and SN1954J in NGC 2403*
Authors: Humphreys Roberta M. , Davidson Kris , Van Dyk Schuyler D. , Gordon Michael S. 
Published: October 2017

Abstract
We describe new results on two supernova impostors in NGC 2403, SN 1954J(V12) and SN 2002kg(V37). For the famous object SN 1954J, we combine four critical observations: its current SED, its Hα emission line profile, the Ca ii triplet in absorption in its red spectrum, and the brightness compared to its pre-event state. Together, these strongly suggest that the survivor is now a hot supergiant with T ∼ 20,000 K, a dense wind, substantial circumstellar extinction, and a G-type supergiant companion. The hot star progenitor of V12's giant eruption was likely in the post-red supergiant stage and had already shed a lot of mass. V37 is a classical LBV/S Dor variable. Our photometry and spectra observed during and after its eruption show that its outburst was an apparent transit on the HR Diagram due to enhanced mass loss and the formation of a cooler, dense wind. V37 is an evolved hot supergiant at ≈106

with a probable initial mass of 60–80

.
Introduction
Authors: Trainar Philippe , Villeneuve Stéphane 
Published: October 2017

L’assurance en France collecte plus de 200 Md€ de cotisations chaque année et dispose d’un portefeuille de placements de près de 2 300Md€, soit 103%du PIB. Ces différentes statistiques reflètent le poids économique et social particulièrement élevé de cette industrie, tant elle accompagne tous les Français, particuliers ou entreprises, à tous les stades de la vie ou de leur développement.Eneffet, l’assurance protège les Français et leurs biens (voiture, habitation, etc.) contre des risques de toutes natures. Elle protège aussi l’activité et les biens des entreprises, de plus en plus des conséquences d’une attaque informatique. En raison du succès de l’assurance vie, elle finance massivement l’économie, notamment, les entreprises (59 %), mais aussi les États (33 %) ; ces investissements prennent la forme d’obligations (71 %), mais aussi d’actions (17 %). Enfin, l’assurance française s’internationalise lentement avec un chiffre d’affaires réalisé à l’étranger en légère hausse, tout comme celui réalisé par des assureurs étrangers en France, signe d’une certaine maturité du marché français de l’assurance. Classification JEL : D14, E21, G22.
Panorama de l'industrie française de l'assurance
Authors: Bardaji José 
Published: October 2017

L’assurance en France collecte plus de 200 Md€ de cotisations chaque année et dispose d’un portefeuille de placements de près de 2 300Md€, soit 103% du PIB. Ces différentes statistiques reflètent le poids économique et social particulièrement élevé de cette industrie, tant elle accompagne tous les Français, particuliers ou entreprises, à tous les stades de la vie ou de leur développement.Eneffet, l’assurance protège les Français et leurs biens (voiture, habitation, etc.) contre des risques de toutes natures. Elle protège aussi l’activité et les biens des entreprises, de plus en plus des conséquences d’une attaque informatique. En raison du succès de l’assurance vie, elle finance massivement l’économie, notamment, les entreprises (59 %), mais aussi les États (33 %) ; ces investissements prennent la forme d’obligations (71 %), mais aussi d’actions (17 %). Enfin, l’assurance française s’internationalise lentement avec un chiffre d’affaires réalisé à l’étranger en légère hausse, tout comme celui réalisé par des assureurs étrangers en France, signe d’une certaine maturité du marché français de l’assurance. Classification JEL : D14, E21, G22.
Sesv Operations - Seven Years of Highly Reliable Solution
Authors: Lima Ubirajara , Dendena Marcio , Ribeiro Felipe , Falcometa Bernardo , Pereira Pedro 
Published: October 2017

Abstract
This paper presents the solution developed by Petrobras to support oilfield development in Campos and Santos (pre-salt) Basins. This system solution consists of a ship fitted with specialized topside and improved production string design, which together allow for quick XMT installation avoiding slickline or wireline operations, thus completely dismissing drill rigs after production or injection strings.
Flow Rate Measurement Using Test Separator and PDG Data Allows Individual and Commingled Production Zone Flow Rate History Calculation
Authors: Coimbra A , Puntel E. 
Published: October 2017

AbstractThroughout the last years, considerable efforts have been made to increase the quality of reservoir monitoring, as to improve managing and predictability. The quality improvement in reservoir management achieved with the acquisition of bottomhole data through the use of permanent downhole gauges, PDGs, is so remarkable[1],[2] that today the requisite of PDG installation, mainly in wet x-mas tree completions, is nearly out of question[3] either for oil or gas producers or for water or gas injectors. Unfortunately, corresponding progress has not been attained with respect to the individualized flow measurement per well[4], or better yet, per completion interval in a single well, despite the recent advances in technology available to this effect[5],[6].This paper presents results obtained through measurement of downhole flow rate and its correction to surface conditions from a well under commingled production zone. Earlier, Puntel [7] presented a first case in Portuguese considering one completion zone with a well that has, between the completion equipments, two PDG Mandrels, one of them measuring pressure between string and casing; the other measuring the pressure within the production string. These PDGs are located almost at the same vertical depth, but are related to different flow areas, so that the pressure difference recorded between them can also be used to calculate the total flow rate. Furthermore, another typical installation provides access to two or more completed zones, allowing individual annular pressure measurements. This completion scheme also provides ICV[8],[9] control, turning it possible to calculate individual zone contributions through almost the same methodology adopted to the one zone base case.The flow rate is obtained by means of the Bernoulli equation[10], assuming measurement of differential pressure between two flow sections with different cross sectional areas or otherwise, the Darcy-Weisbach equation[11], referring to the pressure loss through long pipes with same cross sectional area. Thermodinamic functions as well as a simple calibration procedure provide volumetric flow rate correction from bottomhole to surface pressure and temperature conditions. Deviation from ideal behavior can indicate change in flow regime or, for instance, scale buildup[12] inside production tubing. Those techniques are feasible with high precision for single-phase liquid flow, a condition observed more frequently at bottomhole conditions. Field examples are provided to illustrate all presented cases.
First Application of Foamed Cement for Production Operation in Ultradeepwater Well: Case History
Authors: Antunes Tarcisio , Blanc Romulo , Fiorotti João , Oliveira Thais , Perez Miguel Vicente 
Published: October 2017

Abstract
An oil field located in the northern Campos basin has been producing since 1995. It is located in water depths ranging from 1500 to 2100 m and presents hydrocarbon accumulation in sandstone formations comprised of ten units. While conducting infield drilling, depleted zones with severe lost circulation issues were expected. Cementing operations in such conditions can be challenging and require special attention to cementing the drillstring and completely achieving zonal isolation objectives. During preplanning, foamed cement was considered based on its ability to mitigate formation compaction caused by formation depletion, the capability to fill lost-circulation voids compared to nonfoamed slurries, its excellent displacement properties, and good cement bond results, making it an excellent solution for this challenging scenario.
This paper presents a case history where foamed cement was used for a production casing in an ultradeepwater well in Brazil. The 12 1/4-in. production section was drilled to total depth (TD) using managed pressure drilling (MPD) technology and synthetic-based mud (SBM) at a density of 8.7 lbm/gal + surface backpressure (SBP). The goals for the cementing operation were the same as for the other production wells:
Provide a 200-m casing-to-casing barrier Achieve an 830-m height of cement (HOC) and top of cement (TOC) at 2900 m Evaluate the cement sheath using a bond log Provide complete zonal isolation across the reservoir Displace the drilling fluid across the annulus and place a competent cement slurry Provide hydraulic isolation between future fracturing stages Prevent isolating the perforation at 2710 m [annular pressure buildup (APB) mitigation]
The cementing challenges were significant and required the use of lightweight slurry to remain within the operational pressure window. Cementing best practices were closely followed, helping ensure a good bond was obtained under these conditions. Finally, the post-job cement bond log showed excellent bonding to the formation and pipe, which meant competent zonal isolation and wellbore were delivered for production.
An Integrated Approach in a Integrity Service Assists in Improving Zonal Isolation in Production Section
Authors: Martinez F. , Cardoso O. F. , Oyatomari C. , Moretti F. , Gomez J. M. , Ramirez F. 
Published: October 2017

Abstract
A multidisciplinary well integrity evaluation was performed in Latin America with the objective to improve zonal isolation issues caused by a channel that formed after cement placement between different formations in the production section of the well. The differential pressure between a high-pressure water zone and heavily depleted reservoir was observed to be the main driver behind this issue.
A well integrity service enabled analyzing a large amount of historical data from wells drilled between 2015 and 2016 in a timely fashion. This analysis accounted for a cross-verification of drilling practices, openhole logs, petrophysical evaluations, cement placement, and log evaluations between the wells, which led to formulation of two hypotheses concerning the conditions that are responsible for a post-placement channel:Differential pressure between water zone (high pressure) and zone of interest (low pressure) was higher than in those cases where crossflow did not happen.The depleted zone of interest presented higher mobility conditions, which could contribute to making the scenario more prone to crossflow due to pressure leakoff in the sandstone.
Based on these observations and drilling risk analysis, the drilling and completion programs on the subsequent well were adjusted. One of the decisions was to stop drilling before getting into the high-pressure water zone in the production interval. Another one was to optimize the cement placed in front of the high-permeability zone of interest, using high-tier technology with the objective of minimizing the cement-to-formation interactions and achieving enhanced properties.
In the case history, a well drilled with the new drilling program combined with improved cement properties showed adequate isolation across all target formations confirming the success of the well integrity service. Achieving zonal isolation from the beginning allowed the operator to move forward with drilling and completion programs, avoiding nonproductive time and costs that could reach USD 500,000 in remedial operations.
Achieving proper zonal isolation to assure the well integrity requires interaction between the multiple disciplines working in the well construction. By taking the holistic approach provided in the well integrity evaluation service, it was possible increase the level of assurance on cement evaluation interpretation and recognize the main contributing factors for formation crossflow. Mostly important, it provided a new insight, allowing the operator to make better decisions and, together with the service company, define the solution for properly isolating the formations in the production section without the need of remedial operations.
Subsea Fiber Wet-Mate Connectors: Achieving the Balance between Consistent Optical Performance, Product Cost and Compact Size
Authors: Saxton Elaine , Parente Helyson 
Published: October 2017

Fiber connectors have been used in the Subsea Oil & Gas industry for some years. As the hunger for data grows, long step outs become more common and fiber communications in other industries becomes standard, the use of fiber in subsea Oil & Gas fields is set to increase. Whilst the optical loss along the fiber itself is low and the data-collection possibilities are high, these applications, and others besides, will only be fully realised if wet-mate fiber connectors can consistently achieve high optical performance.
A fiber connection is a physical face-to-face alignment of two fiber cores which are typically 9microns (9 thousandths of a millimetre) in diameter. A tiny misalignment, stand-off or particle of contamination at the 9micron connection point could cause an unwanted optical loss. Therefore in order to achieve the required optical specifications, the optical alignment must be extremely precise and the connection must be very clean.
Achieving both of these essential criteria within a wet-mateable fiber connector is particularly challenging. The necessary pressure compensation adds to the size and complexity of the design. Not only do industry specifications require excellent optical performance but the subsea structures housing wet-mate connectors are limited for space, and product cost effectiveness in a competitive market is increasingly important.
Siemens Subsea will demonstrate how the combination of proven subsea connector knowledge, together with a compact & innovative design, modular approach and an emphasis on cleanliness in assembly has been providing consistent and excellent results. The conclusion will provide results and evidence from a thorough Qualification programme which exceeds current industry requirements.
Optimizing Production of Santos Basin Pre-Salt Fields through Sound Reservoir Management Practices
Authors: Pizarro Jorge Oscar de S. , Poli Renato Espirito B. , Rosa Marcelo Becher , Silva Victor Costa da , Branco Celso Cesar M. , Cunha Bruno Miranda , Doria Maria Assunção F. S. , Alles Noé , Batello Daniel , Pinto Antonio C. C. 
Published: October 2017

Abstract
Since the beginning of the Santos basin pre-salt commercial production, in December 2010, more than 1 billion barrels of high quality oil have been extracted from these ultra-deep water carbonate reservoirs. To enable and accelerate production, Petrobras and its partners applied advanced and innovative technologies in various areas of engineering. This paper focuses on the reservoir strategies conceived during the design phase of the Lula and Sapinhoá development projects and their application in these fields.
The authors highlight practices and processes whose extensive use, in this type of scenario, were not standard. Among these, the dynamic characterization of the reservoirs by the use of long-term tests coupled with remote monitoring of pressure; water and gas production control by alternating injected fluids; intensive use of intelligent completion; convertible wells to accelerate production growth (ramp-up); CO2 injection from the start of production; rock-fluid interaction tests; optimization of well stimulation and many others.
Knowledge acquired during the first seven years of commercial production and the actions implemented to manage the reservoirs reflect on the production plateau extension and the final length of their expected productive life. The collection and analysis of static and dynamic data proved to be valuable to reduce uncertainties and support further development decisions. Integrated effort contributed to risk mitigation, production maintenance and increased forecasted final recovery.
The results obtained emphasize the importance of an effective reservoir management approach to maximize production and recovery. Concepts adopted are clarified through practical examples showing the advantages and gains from their implementation. The final message is that safe and viable operation of ultra-deep offshore fields benefits from additional investments in acquiring specific reservoir data. Their integrated analysis using advanced and up-to-date techniques is considered essential to maintain and improve asset values.
Unitization Involving Non Contracted Area: Comparison Between Contractual Models
Authors: Da Silva C. V. , Bonolo D. D. 
Published: October 2017

Abstract
In accordance with the regulations in force with respect to individualization of production (unitization), the Brazilian Government does not make any disbursement to bear its share of the investments and operating costs related to the production development of a shared reservoir. Accordingly, the amount must be paid by the other parties and discounted from the volume to which the Brazilian Government will be entitled according to its working interest determined on Production Individualization Agreement (AIP). Therefore, the Brazilian Government isn't has any business risk.
Representatives of private companies operating in Brazil refer to this situation as "the fourth regime", in reference to the three different exploration and production contracts in the country: Concession Contract, Onerous Assignment Contract and Production Sharing Contract. In this sense, the objective of this study is to compare the devices contained in the Brazilian legislation of the petroleum industry, regarding the individualization of the production of deposits, with the characteristics of the most common models of risk service contracts, according of the literature, and with production sharing contracts. As a result, it is hoped to contribute to the academic understanding of the subject by legislators, regulators and negotiators, representatives of the Brazilian Government and the private sector, considering that the estimated oil production from deposits that are or will be involved in significant unitization processes with the Brazilian Government.