bluuebunny/crossref_metadata_2025_split huggingface dataset:
Improved Chemical Deliverability Reduces Operational Cost
Authors: Vilain R. , Francis-Lacroix K. , Orosco C. 
Published: June 2016

Abstract
Maturation of hydrocarbon reserves often occurs conjointly with an increase in flow assurance challenges. Deposition of paraffin and/or asphaltene is at the forefront of these challenges. Well maturity, declining reservoir pressure, coupled with hydrocarbon deposition, negatively impact the economic potential of a given reserve. Trinidad's Block Two Region is inundated with hundreds of mature paraffinic wells. To maintain cost effectiveness; proactive initiatives must be implemented with minimal operational expenditure.
One such initiative used in the remediation of downhole hydrocarbon deposition, is the implementation of downhole treatment via chemical additives. Newer wells are often completed with allowances to enable targeted downhole chemical remediation. However, for older wells, as is the case in some Trinidad onshore blocks, the implementation of these enhanced modes of downhole chemical delivery, typically requires redesign of the downhole completion. The capital associated with this activity is considered cost prohibitive given the current oil price and low oil production from majority of these wells.
This paper serves to highlight the profitability study with regards to the successful implementation of three common modes of topside treatment of paraffin deposition; steam treatment, annular chemical injection, and periodic batch treatment. It will also compare the return on investment associated with these successful applications.
In this present economic climate, it is imperative for producers to adopt a proactive approach in the resolution of flow assurance challenges, namely hydrocarbon deposition, to ensure maximized production.
An Integrated Approach for Evaluating Reservoir Performance using Production Data - A Case Study from the Angostura Field in Trinidad and Tobago
Authors: Heris A. E. , Narayanan K. , Isenmann G. P. , Fassihi R. R. , Muralidharan V. 
Published: June 2016

Abstract
This case study presents an analysis of production and pressure data from the Horst reservoir, an uplifted fault block with a thin oil rim and large gas cap in the greater Angostura field offshore Trinidad and Tobago. The study resulted in reinterpretation of the volumetrics and improved understanding of connectivity and compartmentalization in the field. This paper demonstrates how the application of fundamental Reservoir Engineering principles provides an effective way to understand reservoir flow dynamics and can guide the use of more sophisticated numerical techniques. The insights gained from this approach illustrate the importance of acquiring good quality data during the appraisal, start-up and production phases of an oil and gas field. Also, this study reinforces the benefits of using idle wells as observation wells for obtaining reservoir surveillance data.
The greater Angostura field consists of Oligocene age turbidite sandstone reservoirs with multiple compartments and complex geology. Some uncertainties remain in seismic interpretation with regards to mapping reservoir boundaries due to poor seismic imaging in the area. Consequently, analysis of production performance was critical to distinguish between different scenarios that were developed using seismic volume interpretation.
Formation pressures in the Horst reservoir were obtained after two years of production from offset reservoirs. Pressures were significantly different from the offset reservoirs indicating that Horst reservoir was potentially a separate compartment. The Horst commenced production after two years of offset production and was initially constrained due to high GOR. In the recent years, the Horst reservoir production has been considerably increased due to additional drilling and the commencement of gas sales from the greater Angostura field.
This paper presents the results of material balance and numerical simulation studies on the strong production performance seen in the Horst reservoir. The reservoir pressures for all blocks were estimated and the potential communication between reservoirs was investigated with material balance analysis. This led to an estimate of the Horst reservoir in-place volumes that were significantly higher than the originally mapped volumes. The insight from the material balance analysis was incorporated into a numerical simulation modeling effort. A robust simulation history match was obtained with a unique but practical approach to model the pressure depletion seen in the Horst reservoir during periods of no production. The simulation model was used to develop an optimized reservoir management strategy which has been implemented to increase production and recovery from the Angostura field. Furthermore, the improved understanding of reservoir performance has led to refinements of the geological and seismic interpretation of the Horst area.
Risk profiling of cattle farms as a potential tool in risk-based surveillance for Mycobacterium bovis infection among cattle in tuberculosis-free areas
Authors: Ribeiro-Lima Joao , Schwabenlander Stacey , Oakes Michael , Thompson Beth , Wells Scott J. 
Published: June 2016

Abstract
OBJECTIVE To develop a cattle herd risk-profiling system that could potentially inform risk-based surveillance strategies for Mycobacterium bovis infection in cattle and provide information that could be used to help direct resource allocation by a state agency for this purpose.
DESIGN Cross-sectional study.
SAMPLE Records for any size movement (importation) of cattle into Minnesota from other US states during 2009 (n = 7,185) and 2011 (8,107).
PROCEDURES Data from certificates of veterinary inspection were entered into a spreadsheet. Movement data were summarized at premises and county levels, and for each level, the distribution of cattle moved and number of movements were evaluated. Risk profiling (assessment and categorization of risk for disease introduction) for each import movement was performed on the basis of known risk factors. Latent class analysis was used to assign movements to risk classifications with adjustment on the basis of expert opinions from personnel knowledgeable about bovine tuberculosis; these data were used to classify premises as very high, high, medium, or low risk for disease introduction.
RESULTS In each year, approximately 1,500 premises imported cattle, typically beef and feeder types, with the peak of import movements during the fall season. The risk model identified 4 risk classes for cattle movements. Approximately 500 of the estimated 27,406 (2%) cattle premises in Minnesota were in the very high or high risk groups for either year; greatest density of these premises was in the southeast and southwest regions of the state.
CONCLUSIONS AND CLINICAL RELEVANCE A risk-profiling approach was developed that can be applied in targeted surveillance efforts for bovine tuberculosis, particularly in disease-free areas.
Les églises médiévales du Hainaut d'après les gouaches des albums de Croÿ.
Authors: Thiébaut Jacques 
Published: June 2016

De middeleeuwse kerken in Henegouwen, in de gouaches in de Albums de Croy.
Noord-Frankrijk is waarschijnlijk een streek waarvan het monumentaal patrimonium het sterkst is beschadigd geworden. Merkwaardig genoeg kan men er een goed beeld krijgen van de kastelen en kerken bij het begin van de 17de eeuw, dank zij de gouaches in de albums van de hertog van Croy. 211 dorpen in Henegouwen werden geschilderd. 80 kerken hebben een koor dat lager en nauwer is dan het schip. De torens staan meestal ten westen van het gebouw en hebben gewoonlijk een spits dak wat toont dat de kerk tenminste gedeeltelijk herbouwd werd in de gotische période. Het ware nuttig dit onderzoek uit te breiden naar de andere streken in de reeks albums.
Les premiers inspecteurs primaires du département du Nord : de la loi Guizot (1833) à la loi Falloux (1850)
Authors: Ravier Joël 
Published: June 2016

De eerste inspecteurs van het lager onderwijs in het département Nord : van de wet Guizot (1833) tot de wet Falloux (1850).
In februari heeft Guizot een korps inspecteurs lager onderwijs in het leven geroepen en zo de uitvoering mogelijk gemaakt van de maatregelen vervat in de wet van 28 juni 1833, de eerste grote schoolwet van de 19de eeuw.
In dit artikel wordt beschreven hoe tijdens de julimonarchie en de Tweede Republiek de eerste inspecteurs in het département werden aangeworven en hoe de verhouding tussen dit universitaire korps en de verschillende administratieve en politieke overheden evolueerde.
EG ANDROMEDAE: A NEW ORBIT AND ADDITIONAL EVIDENCE FOR A PHOTOIONIZED WIND
Authors: Kenyon Scott J. , Garcia Michael R. 
Published: June 2016

ABSTRACT
We analyze a roughly 20 yr set of spectroscopic observations for the symbiotic binary EG And. Radial velocities derived from echelle spectra are best fit with a circular orbit having an orbital period of P = 483.3 ± 1.6 days and semi-amplitude K = 7.34 ± 0.07 km s−1. Combined with previous data, these observations rule out an elliptical orbit at the 10σ level. Equivalent widths of H i Balmer emission lines and various absorption features vary in phase with the orbital period. Relative to the radius of the red giant primary, the apparent size of the H ii region is consistent with a model where a hot secondary star with effective temperature T

h
≈ 75,000 K ionizes the wind from the red giant.
ABSOLUTE PROPERTIES OF THE PRE-MAIN-SEQUENCE ECLIPSING BINARY STAR NP PERSEI
Authors: Lacy Claud H. Sandberg , Fekel Francis C. , Pavlovski Krešimir , Torres Guillermo , Muterspaugh Matthew W. 
Published: June 2016

ABSTRACT
NP Per is a well-detached, 2.2 day eclipsing binary whose components are both pre-main-sequence stars that are still contracting toward the main-sequence phase of evolution. We report extensive photometric and spectroscopic observations with which we have determined their properties accurately. Their surface temperatures are quite different: 6420 ± 90 K for the larger F5 primary star and 4540 ± 160 K for the smaller K5e star. Their masses and radii are 1.3207 ± 0.0087 solar masses and 1.372 ± 0.013 solar radii for the primary, and 1.0456 ± 0.0046 solar masses and 1.229 ± 0.013 solar radii for the secondary. The orbital period is variable over long periods of time. A comparison of the observations with current stellar evolution models from MESA indicates that the stars cannot be fit at a single age: the secondary appears significantly younger than the primary. If the stars are assumed to be coeval and to have the age of the primary (17 Myr), then the secondary is larger and cooler than predicted by current models. The Hα spectral line of the secondary component is completely filled by, presumably, chromospheric emission due to a magnetic activity cycle.
EXPLAINING THE STELLAR INITIAL MASS FUNCTION WITH THE THEORY OF SPATIAL NETWORKS
Authors: Klishin Andrei A. , Chilingarian Igor 
Published: June 2016

ABSTRACT
The distributions of stars and prestellar cores by mass (initial and dense core mass functions, IMF/DCMF) are among the key factors regulating star formation and are the subject of detailed theoretical and observational studies. Results from numerical simulations of star formation qualitatively resemble an observed mass function, a scale-free power law with a sharp decline at low masses. However, most analytic IMF theories critically depend on the empirically chosen input spectrum of mass fluctuations which evolve into dense cores and, subsequently, stars, and on the scaling relation between the amplitude and mass of a fluctuation. Here we propose a new approach exploiting techniques from the field of network science. We represent a system of dense cores accreting gas from the surrounding diffuse interstellar medium (ISM) as a spatial network growing by preferential attachment and assume that the ISM density has a self-similar fractal distribution following the Kolmogorov turbulence theory. We effectively combine gravoturbulent and competitive accretion approaches and predict the accretion rate to be proportional to the dense core mass:

. Then we describe the dense core growth and demonstrate that the power-law core mass function emerges independently of the initial distribution of density fluctuations by mass. Our model yields a power law solely defined by the fractal dimensionalities of the ISM and accreting gas. With a proper choice of the low-mass cut-off, it reproduces observations over three decades in mass. We also rule out a low-mass star dominated “bottom-heavy” IMF in a single star-forming region.
SPINNING DUST EMISSION FROM ULTRA-SMALL SILICATES: EMISSIVITY AND POLARIZATION SPECTRUM
Authors: Hoang Thiem , Vinh Nguyen-Anh , Lan Nguyen Quynh 
Published: June 2016

ABSTRACT
Anomalous microwave emission (AME) is an important Galactic foreground of cosmic microwave background radiation. It is believed that AME arises from rotational emission by spinning polycyclic aromatic hydrocarbons in the interstellar medium (ISM). In this paper, we suppose that a new population of ultra-small silicate grains perhaps exists in the ISM, and quantify the rotational emissivity from these tiny particles and its polarization spectrum. We find that spinning silicate nanoparticles can produce strong rotational emission when the tiny grains follow a log-normal size distribution. The polarization fraction of spinning dust emission from tiny silicates increases with decreasing dipole moment per atom (β) and can reach

for

at a grain temperature of 60 K. We identify a parameter space

, with

being the fraction of Si abundance in nanoparticles, in which its rotational emission can adequately reproduce both the observed AME and the polarization of the AME, without violating the observational constraints of ultraviolet extinction and polarization of starlight. Our results reveal that rotational emission from spinning silicate may be an important source of AME.
THE DEPENDENCE OF CORONAL LOOP HEATING ON THE CHARACTERISTICS OF SLOW PHOTOSPHERIC MOTIONS
Authors: Ritchie M. L. , Wilmot-Smith A. L. , Hornig G. 
Published: June 2016

ABSTRACT
The Parker hypothesis assumes that heating of coronal loops occurs due to reconnection, induced when photospheric motions braid field lines to the point of current sheet formation. In this contribution we address the question of how the nature of photospheric motions affects the heating of braided coronal loops. We design a series of boundary drivers and quantify their properties in terms of complexity and helicity injection. We examine a series of long-duration full resistive MHD simulations in which a simulated coronal loop, consisting of initially uniform field lines, is subject to these photospheric flows. Braiding of the loop is continually driven until differences in behavior induced by the drivers can be characterized. It is shown that heating is crucially dependent on the nature of the photospheric driver—coherent motions typically lead to fewer large energy release events, while more complex motions result in more frequent but less energetic heating events.
SHORTEST RECURRENCE PERIODS OF FORCED NOVAE
Authors: Hachisu Izumi , Saio Hideyuki , Kato Mariko 
Published: June 2016

ABSTRACT
We revisit hydrogen shell burning on white dwarfs (WDs) with higher mass accretion rates than the stability limit,

, above which hydrogen burning is stable. Novae occur with mass accretion rates below the limit. For an accretion rate >

, a first hydrogen shell flash occurs followed by steady nuclear burning, so the shell burning will not be quenched as long as the WD continuously accretes matter. On the basis of this picture, some persistent supersoft X-ray sources can be explained by binary models with high accretion rates. In some recent studies, however, the claim has been made that no steady hydrogen shell burning exists even for accretion rates >

. We demonstrate that, in such cases, repetitive flashes occurred because mass accretion was artificially controlled. If we stop mass accretion during the outburst, no new nuclear fuel is supplied, so the shell burning will eventually stop. If we resume mass accretion after some time, the next outburst eventually occurs. In this way, we can design the duration of outburst and interpulse time with manipulated mass accretion. We call such a controlled nova a “forced nova.” These forced novae, if they exist, could have much shorter recurrence periods than “natural novae.” We have obtained the shortest recurrence periods for forced novae for various WD masses. Based on the results, we revisit WD masses of some recurrent novae, including T Pyx.
DYNAMICAL FORMATION OF THE GW150914 BINARY BLACK HOLE
Authors: Rodriguez Carl L. , Haster Carl-Johan , Chatterjee Sourav , Kalogera Vicky , Rasio Frederic A. 
Published: June 2016

ABSTRACT
We explore the possibility that GW150914, the binary black hole (BBH) merger recently detected by Advanced LIGO, was formed by gravitational interactions in the core of a dense star cluster. Using models of globular clusters (GCs) with detailed N-body dynamics and stellar evolution, we show that a typical cluster with a mass of

3
×

10

5

M

⊙

to

6
×

10

5

M

⊙

is optimal for forming GW150914-like BBHs that will merge in the local universe. We identify the most likely dynamical processes for forming GW150914 in such a cluster, and we show that the detection of GW150914 is consistent with the masses and merger rates expected for BBHs from GCs. Our results show that dynamical processes provide a significant and well-understood pathway for forming BBH mergers in the local universe. Understanding the contribution of dynamics to the BBH merger problem is a critical step in unlocking the full potential of gravitational-wave astronomy.
ON ASSOCIATING FAST RADIO BURSTS WITH AFTERGLOWS
Authors: Vedantham H. K. , Ravi V. , Mooley K. , Frail D. , Hallinan G. , Kulkarni S. R. 
Published: June 2016

ABSTRACT
A radio source that faded over six days, with a redshift of z ≈ 0.5 host, has been identified by Keane et al. as the transient afterglow to a fast radio burst (FRB 150418). We report follow-up radio and optical observations of the afterglow candidate and find a source that is consistent with an active galactic nucleus. If the afterglow candidate is nonetheless a prototypical FRB afterglow, existing slow-transient surveys limit the fraction of FRBs that produce afterglows to 0.25 for afterglows with fractional variation,

m
=
2
∣

S

1

−

S

2

∣

/

(

S

1

+

S

2

)
≥
0.7

, and 0.07 for m ≥ 1, at 95% confidence. In anticipation of a barrage of bursts expected from future FRB surveys, we provide a simple framework for statistical association of FRBs with afterglows. Our framework properly accounts for statistical uncertainties, and ensures consistency with limits set by slow-transient surveys.
Psychosocial Clusters and their Associations with Well-Being and Health: An Empirical Strategy for Identifying Psychosocial Predictors Most Relevant to Racially/Ethnically Diverse Women's Health
Authors: Jabson Jennifer M. , Bowen Deborah , Weinberg Janice , Kroenke Candyce , Luo Juhua , Messina Catherine , Shumaker Sally , Tindle Hilary A. 
Published: June 2016

Background Strategies for identifying the most relevant psychosocial predictors in studies of racial/ethnic minority women's health are limited because they largely exclude cultural influences and they assume that psychosocial predictors are independent. This paper proposes and tests an empirical solution. Methods Hierarchical cluster analysis, conducted with data from 140,652 Women's Health Initiative participants, identified clusters among individual psychosocial predictors. Multivariable analyses tested associations between clusters and health outcomes. Results A Social Cluster and a Stress Cluster were identified. The Social Cluster was positively associated with well-being and inversely associated with chronic disease index, and the Stress Cluster was inversely associated with well-being and positively associated with chronic disease index. As hypothesized, the magnitude of association between clusters and outcomes differed by race/ethnicity. Conclusions By identifying psychosocial clusters and their associations with health, we have taken an important step toward understanding how individual psychosocial predictors interrelate and how empirically formed Stress and Social clusters relate to health outcomes. This study has also demonstrated important insight about differences in associations between these psychosocial clusters and health among racial/ethnic minorities. These differences could signal the best pathways for intervention modification and tailoring.
Restauración de la Iglesia del Castillo de Castelldefels
Authors: González Antoni 
Published: June 2016

Como es habitual en todas las restauraciones arquitec­tónicas acometidas por el SPAL, la intervención en la iglesia del Castillo de Castelldefels es el resultado de una rigurosa metodología de análisis del edificio y su entorno, llegando a una propuesta arquitectónica, que es explicada por el autor, como resultado de tres objetivos: revalorizar los aspectos arquitectónicos y artísticos del edificio, adaptarlo funcionalmente para un nuevo uso cultural, y potenciar su capacidad informativa sobre una tan agitada e interesante historia, para reforzar su carácter significativo y emblemático
La fachada de la Iglesia de San Isidoro de Oviedo: etapas de intervención y sugerencias para su conservación y limpieza
Authors: Esbert R.M. , Valdeón L. , Díaz Pache F. , Ordaz J. , Alonso F.J. 
Published: June 2016

Se muestran en este artículo algunos de los aspectos metodológicos que suelen desarrollarse en los estudios sobre diagnosis de la piedra de edificación y que, a su vez, resultan necesarios para plantear las distintas eta­pas de intervención, así como los procedimientos o métodos a aplicar en los trabajos de conservación. Los diversos aspectos implicados se presentan sintetizados, de tal modo que sus contenidos pueden ser utilizados con facilidad por el conjunto de profesionales implicados en las intervenciones. Se ha elegido como ejemplo la fachada de la iglesia barroca de San Isidoro (Oviedo), situada en el casco urbano de la ciudad, junto al Ayunta­miento y cerca de la Catedral, y en la que se va a interve­nir en un futuro inmediato
Enmiendas parciales a la teoría del restauro (II) Valor y valores
Authors: Jiménez Alfonso 
Published: June 2016

<p>El arquitecto Alfonso Jiménez nos presenta la segunda parte del artículo que publicó en el número 4 de LOG­GIA. A las opiniones vertidas entonces sobre la teoría del Restauro, añade sus reflexiones sobre la reprodu­cibilidad industrial de la obra de arte, la metodología de intervención en las obras de fábrica, las exclusiones de los conceptos de funcionalidad y dimensión artística de la intervención. En último lugar analiza en profundi­dad el alcance y la influencia que ha tenido el concepto de valor en todas sus facetas en el transcurso de la his­toria de la restauración.</p><h2><strong><br /></strong></h2><p> </p><p> </p>
Restauración de la imagen de Santa María. Portada norte de la Concatedral de Castellón
Authors: Roig Salom José Luis 
Published: June 2016

La trágica demolición de la Iglesia de Santa María de Castellón trajo consigo la destrucción de la imagen de la Virgen con el Niño que presidía el tímpano de la portada norte. Varios fragmentos recogidos enton­ces por un transeúnte han esperado más de cin­cuenta años para ver la luz, y constituirse en la base de un interesante ejercicio de anastilosis que ha devuelto al nuevo templo la imagen recuperada.