bluuebunny/crossref_metadata_2025_split huggingface dataset:
Exploring for Subtle Stratigraphic Carbonate Traps Within the Upper Shuaiba of Oman
Authors: De Leeuw Kees , Gonguet Christophe 
Published: February 2016

This reference is for an abstract only. A full paper was not submitted for this conference.
Since mid-2003, Petroleum Development Oman has been successfully exploring the stratigraphic Upper Shuaiba play in North Oman. Play understanding has significantly evolved and to date three discoveries have been made. Prograding Aptian shoals and mounds into the Bab Basin interfinger with argillaceous limestones and are truncated by Nahr-Umr shales. Individual reservoirs, in the clinoform apex, are too thin to be resolved on seismic. Stacked clinoform geometries can be observed directly in seismic sections. Delineating these geometries, attribute maps and particularly spectral decomposition maps are used enabling visualisation of tuning bands of the inclined sequences terminating against Nahr-Umr. Frequency slice analyses determine the potential location of reservoir belts or prospects. Spectral decomposition is used to predict reservoir thickness using calibrated analogues. Sequence based geological modelling has resulted in facies distributions over the Bab Basin and the carbonate platforms beyond. The detailed 3D model enables to constrain general trends of the tuning belts observed in seismic. As seismic artefacts are interfering with the actual primary reflections, false trends not aligning with the geological model may be discarded. Seismic modelling shows that porous reservoirs have similar impedance as the Nahr-Umr. The clinoforms present imply that Top Shuaiba is not a uniform hard-kick pick; phase is depending on reservoir thickness and manual picking is necessary. Well placement and geosteering are key factors in increasing success and maximising the value of discoveries. Facies demands a vertical pilot hole placed downdip of an expected sequence and a horizontal sidetrack is designed to follow an individual clinoform stratigraphically updip where reservoir is only a few metres thick. PeriScope (Schlumberger) has added value, enabling to maximise the extent of producible reservoir without unwanted exits and converting a discovery into a producer within a period of one month.
The Late Permian-Early Triassic Khuff Formation in the Middle-East: Sequence Biostratigraphy and Palaeoenvironments by Means of Calcareous Algae and Foraminifers
Authors: Gaillot Jeremie 
Published: February 2016

This reference is for an abstract only. A full paper was not submitted for this conference.
The carbonates and evaporites of the Late Permian Khuff Formation form widespread reservoirs across the Arabian plate and concentrate the biggest gas resources in the world. The material studied includes 1500 samples from outcrops in Iran (Zagros), Turkey, Saudi Arabia and South China. The objectives of the study were (1) to build a robust biotratigraphic framework based on a detailed description of algal-foraminiferal biotic content, (2) to characterize the depositional environments and their temporal successions during the Late Permian and Early Triassic. By comparison of fossils distribution, the Middle/Late Permian Khuff deposits are divided into 8 units limited at their tops by turnovers levels, corresponding to significant reshapings of biotic assemblages. During the Late Permian, the Zagros (Iran), Taurus (Turkey), South China and even Japan share similar foraminiferal assemblages and represent intermittently connected palaeobiogeographic provinces. Palaeoecological results show that the structurally controlled palaeohighs are successively drowned and that the system evolves progressively from a rimmed platform towards an almost uniformly fl at ramp. The major oolitic units (reservoirs) developed within high-subsiding areas by sediment volume funneling, mainly during the late Wuchiapingian (upper K4 reservoir equivalent) and early triassic (K2 reservoir equivalent). The thermal subsidence during the Neotethyan spreading is likely the main factor that drove the Khuff deposition on the Arabian platform and can be related to the demise of the regional permian fauna. The new framework is expected to provide an important tool for further subsurface studies and correlations.
Chronostratigraphy and Source Rock Presence within the Silurian Qusaiba of Qatar
Authors: Reaves Chris , Abdulla Ismail A. , Alway Robert H.S. , Zahran Mamdouh , Moore Leonard , Molyneux Stewart 
Published: February 2016

This reference is for an abstract only. A full paper was not submitted for this conference.
The Qusaiba Formation is the primary source rock for the prolific Paleozoic plays being explored and developed in the Middle East. The super giant Qatar North Field accumulation alone is estimated to contain 900 TCF of recoverable reserves. We have evaluated stratigraphic and facies relationships within the Silurian, including the Qusaiba Formation, as part a systematic evaluation of hydrocarbon prospectivity commissioned by Qatar Petroleum. Well penetrations of the Silurian section in Qatar were integrated with the established regional distribution of the Silurian across the Arabian Platform. Biostratigraphic dating yielded a chronostratigraphic range of Early Silurian (Rhuddanian) to Late Silurian (Wenlockian), with an overall age range of 443Ma to 425Ma. These age dates improved the lateral correlation of second-order maximum flooding surfaces and led to revisions of the standard Silurian lithostratigraphic correlation. The Qusaiba in Qatar was determined to contain three separate source horizons. 1. A Rhuddanian 'hot' shale restricted to paleo-topographic lows established on the underlying Ordovician, 2. A Mid-Aeronian 'hot' shale associated with the early Silurian maximum flood. This horizon is laterally extensive, but the thickest along the western margin of the Qatar Arch, and 3. A Wenlockian lean, 'cool' shale extending over the whole of Qatar. Organic geochemical and petrographic analyses were used to determine source type and richness. Samples were 'back-tracked' to determine original (thermally immature) organic carbon (TOC) and hydrocarbon potential (HI) values. 'Paleo-thermometry' data from palynomorphs (TAI), conodonts (CCI) and acritarchs (AAI) provided additional control on organic maturity.
Vertical Seismic Profile (VSP): Beyond Time-to-Depth
Authors: Hornby Brian , Yu Jianhua 
Published: February 2016

This reference is for an abstract only. A full paper was not submitted for this conference.
VSP or Vertical Seismic Profile was originally designed and is currently primarily used, to give us time-to-depth for seismic-well tie. Beyond time-to-depth a number of possibilities exist. Recently, there has been considerable interest in VSP imaging with extensive surveys being acquired both on land and offshore. Modeling studies using full-waveform finite-difference method (FDM) show us what we can image for a particular acquisition geometry and geology, with best image results seen with 3D VSP surveys incorporating a large VSP array in the well and an areal grid of surface sources obtained using a seismic shooting vessel. Traditionally, VSP imaging has been implemented using surface seismic processing algorithms. However, the VSP geometry poses its own challenges and unique opportunities. In this talk we will discuss the state of the art of the technology, what technologies are appropriate for different settings, and what the future may bring. Results will be shown from deepwater Gulf of Mexico prospects and we will discuss how these results have impacted our understanding of the reservoir and reduced risk on development well placement. On imaging algorithms we will examine some exciting new developments to develop specialized algorithms to take advantage of the opportunities posed by the VSP geometry. These developments include controlled local beam methods to improve image quality, imaging using multiples and interferometric imaging of salt flanks and structure below complicated overburden.
Reservoir Monitoring Using Permanent In-Well Seismic
Authors: Hornby Brian , Barkved Olav Inge , Williams Brock , Bostick Tad 
Published: February 2016

This reference is for an abstract only. A full paper was not submitted for this conference.
The world's first successful installation of a permanent borehole seismic system in an offshore production well was executed at Valhall. The system is fibre-optic based and consists of 5 levels of 3C seismic sensors spaced 13.5 m apart. Permanent borehole seismic is seen as complementary to the permanent seabed seismic array with the following goals:4D seismic calibration. Use the directly recorded downhole signal to calibrate the surface seismic signal. This might best be done in conjunction with instrumented seabed seismic receivers for full-field monitoring.4D VSP. With several wells instrumented, use surface sources and downhole sensors for reservoir monitoring. Micro-seismic monitoring.
Passive monitoring of faulting caused by reservoir compaction and fluid fronts and active monitoring of cuttings injection and well stimulation. Surveys have been conducted with simultaneous acquisition of permanent seabed and borehole arrays using both active surface sources and passive noise. The active seismic data are of good quality and processing yields high-resolution images to a distance of 400m from the borehole, complementing the lower-resolution surface seismic data. Time-lapse measurements are planned in 2007, with the main objective being to measure pressure changes in the reservoir due to injection from a nearby well. In parallel passive data are analyzed for potential for reservoir monitoring of fluid fronts using micro-seismic data. Additional work relates to calibration of the 4D seismic response for changes in the overburden.
3D FEM modelling for stress simulation and experimental investigation of dual-gradient coating using PVD
Authors: Li Bin 
Published: February 2016

Abstract
In this work, AlZrCrN composite dual-gradient coating was deposited on cemented carbide substrate using physical vapor deposition. Using the composite dual-gradient structure design, the thermal residual stress between layers was decreased and the bonding strength between coating and substrate was increased. Finite element simulation indicates that thermal residual stress in composite dual-gradient coatings is significantly smaller than that in CrN and ZrN single coatings. The bonding strength between composite double-gradient coating and substrate is found to be greater than that of the single-layer coating. The factors and conditions influencing the performance of composite dual-gradient coating can be obtained through numerical calculation. Based on the simulation, coating structure that has a gradual transition from the internal high-plastic long-comb Cr/CrN layer to the outer AlZrCrN wear-resistant layer with stubby morphology was prepared.
A combination of high electrical conductivity and mechanical strength in AA1070 commercially pure aluminum wires fabricated by KoBo extrusion
Authors: Polkowska Adelajda 
Published: February 2016

Abstract
In this work, the effect of KoBo extrusion process parameters on the extrusion force, microstructure, mechanical properties and electrical resistivity of wires fabricated from AA1070 commercially pure aluminum, is analyzed. It is found that applied parameters of the KoBo extrusion process have a strong impact on changes in the extrusion force. The smallest variation of the extrusion force was recorded for the KoBo extrusion conducted with a small oscillation angle and a high extrusion rate. The relatively small alteration of the extrusion force results in a more homogeneous microstructure and mechanical properties of the wires. As compared to the material in the annealed state, the KoBo extruded wires exhibit almost two-fold higher ultimate tensile strength and only a slightly lowered electrical conductivity. The best combination of electrical conductivity and mechanical strength was 60.3 % International Annealed Copper Standard and ultimate tensile strength of 152 MPa, respectively. These results are highly competitive to those reported for AA1070 aluminum subjected to other continuous plastic deformation methods (e. g. the cryorolling combined with a heat treatment). A high electrical conductivity and enhanced mechanical properties (in respect to the as annealed material), clearly indicate that the KoBo extruded AA1070 wires are potentially useful for moderately loaded electrical engineering applications.
THE 31 DEG2 RELEASE OF THE STRIPE 82 X-RAY SURVEY: THE POINT SOURCE CATALOG
Authors: LaMassa Stephanie M. , Urry C. Megan , Cappelluti Nico , Böhringer Hans , Comastri Andrea , Glikman Eilat , Richards Gordon , Ananna Tonima , Brusa Marcella , Cardamone Carie , Chon Gayoung , Civano Francesca , Farrah Duncan , Gilfanov Marat , Green Paul , Komossa S. , Lira Paulina , Makler Martin , Marchesi Stefano , Pecoraro Robert , Ranalli Piero , Salvato Mara , Schawinski Kevin , Stern Daniel , Treister Ezequiel , Viero Marco 
Published: February 2016

ABSTRACT
We release the next installment of the Stripe 82 X-ray survey point-source catalog, which currently covers 31.3 deg2 of the Sloan Digital Sky Survey (SDSS) Stripe 82 Legacy field. In total, 6181 unique X-ray sources are significantly detected with XMM-Newton (>5σ) and Chandra (>4.5σ). This catalog release includes data from XMM-Newton cycle AO 13, which approximately doubled the Stripe 82X survey area. The flux limits of the Stripe 82X survey are 8.7 × 10−16 erg s−1 cm−2, 4.7 × 10−15 erg s−1 cm−2, and 2.1 × 10−15 erg s−1 cm−2 in the soft (0.5–2 keV), hard (2–10 keV), and full bands (0.5–10 keV), respectively, with approximate half-area survey flux limits of 5.4 × 10−15 erg s−1 cm−2, 2.9 × 10−14 erg s−1 cm−2, and 1.7 × 10−14 erg s−1 cm−2. We matched the X-ray source lists to available multi-wavelength catalogs, including updated matches to the previous release of the Stripe 82X survey; 88% of the sample is matched to a multi-wavelength counterpart. Due to the wide area of Stripe 82X and rich ancillary multi-wavelength data, including coadded SDSS photometry, mid-infrared WISE coverage, near-infrared coverage from UKIDSS and VISTA Hemisphere Survey, ultraviolet coverage from GALEX, radio coverage from FIRST, and far-infrared coverage from Herschel, as well as existing ∼30% optical spectroscopic completeness, we are beginning to uncover rare objects, such as obscured high-luminosity active galactic nuclei at high-redshift. The Stripe 82X point source catalog is a valuable data set for constraining how this population grows and evolves, as well as for studying how they interact with the galaxies in which they live.
IMAGING AN EVENT HORIZON: MITIGATION OF SOURCE VARIABILITY OF SAGITTARIUS A*
Authors: Lu Ru-Sen , Roelofs Freek , Fish Vincent L. , Shiokawa Hotaka , Doeleman Sheperd S. , Gammie Charles F. , Falcke Heino , Krichbaum Thomas P. , Zensus J. Anton 
Published: February 2016

ABSTRACT
The black hole in the center of the Galaxy, associated with the compact source Sagittarius A* (Sgr A*), is predicted to cast a shadow upon the emission of the surrounding plasma flow, which encodes the influence of general relativity (GR) in the strong-field regime. The Event Horizon Telescope (EHT) is a Very Long Baseline Interferometry (VLBI) network with a goal of imaging nearby supermassive black holes (in particular Sgr A* and M87) with angular resolution sufficient to observe strong gravity effects near the event horizon. General relativistic magnetohydrodynamic (GRMHD) simulations show that radio emission from Sgr A* exhibits variability on timescales of minutes, much shorter than the duration of a typical VLBI imaging experiment, which usually takes several hours. A changing source structure during the observations, however, violates one of the basic assumptions needed for aperture synthesis in radio interferometry imaging to work. By simulating realistic EHT observations of a model movie of Sgr A*, we demonstrate that an image of the average quiescent emission, featuring the characteristic black hole shadow and photon ring predicted by GR, can nonetheless be obtained by observing over multiple days and subsequent processing of the visibilities (scaling, averaging, and smoothing) before imaging. Moreover, it is shown that this procedure can be combined with an existing method to mitigate the effects of interstellar scattering. Taken together, these techniques allow the black hole shadow in the Galactic center to be recovered on the reconstructed image.
THE QUARKYONIC STAR
Authors: Fukushima Kenji , Kojo Toru 
Published: February 2016

ABSTRACT
We discuss theoretical scenarios on crossover between nuclear matter (NM) and quark matter (QM). We classify various possibilities into three major scenarios according to the onset of diquark degrees of freedom that characterizes color-superconducting (CSC) states. In the conventional scenario NM occurs at the liquid–gas (or liquid–vacuum at zero temperature) phase transition and QM occurs next, after which CSC eventually appears. With the effect of strong correlation, the BEC–BCS (Bose Einstein Condensation–Bardeen Cooper Schrieffer) scenario implies that CSC occurs next to NM and QM comes last in the BCS regime. We adopt the quarkyonic scenario in which NM, QM, and CSC are theoretically indistinguishable and thus these names refer to not distinct states but relevant descriptions of the same physical system. Based on this idea, we propose a natural scheme to interpolate NM near normal nuclear density and CSC with vector coupling at high baryon density. We finally discuss the mass–radius relation of the neutron star and constraints on parameters in the proposed scheme.
Efficacy and Safety of Baricitinib in Japanese Patients with Active Rheumatoid Arthritis Receiving Background Methotrexate Therapy: A 12-week, Double-blind, Randomized Placebo-controlled Study
Authors: Tanaka Yoshiya , Emoto Kahaku , Cai Zhihong , Aoki Takehiro , Schlichting Douglas , Rooney Terence , Macias William 
Published: February 2016

Objective.To evaluate efficacy and safety, baricitinib [Janus kinase (JAK) 1/JAK2 inhibitor] was compared with placebo in Japanese patients with active rheumatoid arthritis (RA) despite background treatment with methotrexate (MTX).Methods.This was a phase IIB, double-blind, randomized, placebo-controlled study (clinicaltrials.gov: NCT01469013). Patients had moderate to severe active adult-onset RA despite stable treatment with MTX. Patients (n = 145) were randomized in a 2:1:1:1:1 ratio to placebo or 1 mg, 2 mg, 4 mg, or 8 mg oral baricitinib daily for 12 weeks. The primary analysis compared the combined 4/8-mg dose groups with placebo for the American College of Rheumatology (ACR) 20 response rate at 12 weeks. Other outcomes included additional measures of disease activity, physical function, laboratory abnormalities, and adverse events.Results.A significantly higher proportion of patients in the combined 4/8-mg baricitinib group (37/48, 77%) compared with the placebo group (15/49, 31%) had at least an ACR20 response after 12 weeks of treatment (p < 0.001). Significant improvements in disease activity, remission, and physical function were observed as early as Week 2 of treatment with baricitinib, particularly with daily doses of ≥ 4 mg. Only 1 patient receiving baricitinib discontinued because of an adverse event. Adverse event rates with baricitinib doses ≤ 4 mg daily were similar to placebo, but there was a higher incidence of adverse events and laboratory abnormalities in the 8-mg group.Conclusion.In this phase II study, baricitinib was well tolerated and rapidly improved the signs, symptoms, and physical function of Japanese patients with active RA, supporting continued development of baricitinib (clinicaltrials.govNCT01469013).
Comparison of Clinical Examination versus Whole-body Magnetic Resonance Imaging of Enthesitis in Patients with Early Axial Spondyloarthritis during 3 Years of Continuous Etanercept Treatment
Authors: Althoff Christian E. , Sieper Joachim , Song In-Ho , Weiß Anja , Diekhoff Torsten , Haibel Hildrun , Hamm Bernd , Hermann Kay-Geert A. 
Published: February 2016

Objective.To compare clinical examination versus whole-body magnetic resonance imaging (WB-MRI) of enthesitis in patients with early axial spondyloarthritis during 3 years of continuous etanercept (ETN) treatment.Methods.Forty-one patients underwent clinical and WB-MRI examinations for enthesitis at baseline and after 2 and 3 years of treatment. Twenty-one sites were assessed in 4 anatomic regions — anterior chest wall, pelvis, knee, and foot.Results.Clinical examination at baseline detected enthesitis in 57% of the patients (85 lesions, mean 2.1 lesions, SD 2.9), most of them in the pelvis (42 lesions in 17 patients) and anterior chest wall (19 lesions in 10 patients). The proportion of patients with clinically detected enthesitis decreased to 19% at Year 2 (mean 0.5, SD 1.5) and 14% at Year 3 (mean 0.7, SD 1.8). WB-MRI detected enthesitis at baseline in 21% of patients (22 lesions, mean 0.5 lesions, SD 1.1), also most frequently in the pelvis (12 lesions) and anterior chest wall (7 lesions). MRI-positive enthesitis decreased to 13% at Year 2 (mean 0.2 lesions, SD 0.5) and 14% at Year 3 (mean 0.2 lesions, SD 0.5). There was positive correlation of clinical and MRI findings at baseline at the anterior chest wall (p = 0.001) and the pelvis (p = 0.0001). No correlation was found at the knee and foot at baseline and for all regions at followup.Conclusion.Both clinical examination and WB-MRI show a decrease in enthesitis after 2 and 3 years of ETN treatment, but correlation was limited to the pelvis and anterior chest wall at baseline.
An Adaptive Finite Element Method with Hybrid Basis for Singularly Perturbed Nonlinear Eigenvalue Problems
Authors: Li Ye 
Published: February 2016

AbstractIn this paper, we propose an uniformly convergent adaptive finite element method with hybrid basis (AFEM-HB) for the discretization of singularly perturbed nonlinear eigenvalue problems under constraints with applications in Bose-Einstein condensation (BEC) and quantum chemistry. We begin with the time-independent Gross-Pitaevskii equation and show how to reformulate it into a singularly perturbed nonlinear eigenvalue problem under a constraint. Matched asymptotic approximations for the problem are reviewed to confirm the asymptotic behaviors of the solutions in the boundary/interior layer regions. By using the normalized gradient flow, we propose an adaptive finite element with hybrid basis to solve the singularly perturbed nonlinear eigenvalue problem. Our basis functions and the mesh are chosen adaptively to the small parameter ε. Extensive numerical results are reported to show the uniform convergence property of our method. We also apply the AFEM-HB to compute the ground and excited states of BEC with box/harmonic/optical lattice potential in the semiclassical regime (0 <ε≪C 1). In addition, we give a detailed error analysis of our AFEM-HB to a simpler singularly perturbed two point boundary value problem, show that our method has a minimum uniform convergence order