bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fast Analysis of Optimal IOR Switch Time Using a Two-Factor Production Model and Least-Squares Monte Carlo Algorithm
Authors: Hong Aojie , Bratvold Reidar B. , Lake Larry W. 
Published: April 2018

Abstract
Simple or proxy production models are potentially very useful and tractable because they are computationally attractive whilst still providing insight to the decision at hand. Useful and tractable models are required for supporting high-quality decisions in uncertain, complex, and computationally demanding contexts. A key decision for development planning is: what is the optimal time to initiate an Improved-Oil-Recovery (IOR) process. We aim to illustrate the implementation and application of a useful and tractable approach for the analysis of the optimal IOR switch time using a two-factor production model and Least-Squares Monte Carlo (LSM) simulation.
The two-factor production model contains only two parameters for each recovery phases. One parameter describes how much recovery efficiency a recovery mechanism can ultimately achieve whilst the other describes how fast the recovery efficiency increases. The simplicity of the model makes it computationally attractive. The LSM algorithm is an approximate dynamic programming approach, which allows for learning over time. It provides a near-optimal solution for the IOR switch time problem. The Value-Of-Information (VOI) framework—a powerful decision-analysis tool—provides an estimate of the value of learning.
Closed-Loop Reservoir Management (CLRM) is considered to be a state-of-the-art approach to solving for the optimal IOR switch time. However, this approach can produce a suboptimal solution as the CLRM approach considers only uncertainties and actions reflecting currently available information but not those uncertainties and actions arising from future information. The dynamic programming approach used here considers both the impact of the information obtained before a decision is made and the impact of the information that might be obtained to support future decisions. We conclude that a dynamic programming approach, such as the LSM algorithm, can significantly improve both the timing and value of decisions, leading to a significant increase in a field's economic performance. Furthermore, the two-factor model combined with the LSM algorithm is tractable and provides useful insight into the IOR switch time problem.
The novelties provided by this work are: developing and illustrating the structure of the IOR switch time problem in a decision tree, demonstrating and discussing the suboptimality of the CLRM solution, developing and illustrating the detailed steps of applying the LSM algorithm for the IOR switch time decision, and implementing the two-factor model combined with the LSM algorithm for analyzing the optimal IOR switch time.
Successful Implementation of Real-Time Look-Ahead Resistivity Measurements in the North Sea
Authors: Khalil Haitham , Seydoux Jean , Denichou Jeanmi , Omeragic Dzevat , Salim Diogo , Thiel Michael , Beeh Hany , Dhaher Karam , Constable Monica Vik , Antonsen Frank , Tiku Arun , Hodne Jarleif , Lokna Joakim , Haldorsen Kjetil , Aarflot Haakon , Fjellanger Jan Petter 
Published: April 2018

Abstract
In this case study, we present the use of a new look-ahead resistivity technology to solve a challenge on the Valemon field where the top of the reservoir could not be mapped from surface seismic. The objective was to extend the overburden section deep enough to secure sufficient formation strength at the casing shoe while eliminating the risk of accidental drilling into the reservoir below. The application of the new technology secured standard casing design, and eliminated the extra time and costs associated with implementation of the managed pressure drilling technique. The target was to extend the 12 ¼-in overburden section 10-15m TVD into the Viking Group, as this formation generally provides sufficient formation strength for the 9 7/8-in casing shoe to enable conventional drilling of the following reservoir section. As there was a risk that the Viking Group could be absent or very thin in this area of the Valemon field, the look ahead measurement was used to monitor the formations ahead of the bit while drilling. Detection of higher resistivity ahead of the bit indicating an approaching reservoir would enable stopping prior to drilling into it. No reservoir response was detected ahead of the bit, and this enabled a safe extension of the 12 ¼-in section into the Viking Group as per the objective.
Evaluating the excess sludge reduction in activated sludge system with ultrasonic treatment
Authors: Wu Shuang , Zheng Min , Dong Qian , Liu Yanchen , Wang Chengwen 
Published: April 2018

Abstract
Ultrasonic treatment for enhancing biological processes has recently attracted considerable attention in wastewater treatment. In this study, we systematically investigated the mixed liquor properties of activated sludge under ultrasonic treatment. The sludge samples were collected from the aerobic tank of a full-scale membrane bioreactor (MBR) treating municipal wastewater, and the volatile suspended solids (VSS) concentration was approximately 6.0 g/L. The results showed that ultrasonic treatment induced floc disintegration, organics release, temperature increase, microbial activity and pH variation. The maximum mg soluble chemical oxygen demand (COD) per mg VSS released was estimated to be 0.147 using the Monod equation. The exponential increase in the concentration of dissolved organic matter is related to the loss of relative heterotrophic bacterial activity. A sonolysis-cryptic growth model was demonstrated to be capable of describing ultrasonic sludge reduction, which would support the further development of ultrasonic treatment technology in activated sludge systems.
Exploring the Principles of Allodoxic Art (in dialogue with Baroness Elsa)
Authors: Jenny Brown  
Published: April 2018

It is possible to bring socio-politically engaged practices into the realm of the commons. These practices I have grouped under the umbrella of allodoxic art, a term defined in the first section of this exposition. Allodoxic art provides a way of bringing into focus the social movement struggles that have shaped the discourse across social and environmental justice, embracing the total contribution of individuals’ artistic forms and active citizenship.

French sociologist Pierre Bourdieu (1930–2002) recuperates the concept of allodoxia that was first used by the Greek philosopher Plato (427–347 BC) to describe false beliefs arising from misrecognition. The word allodoxia derives from two Greek words allo referring to a mixture, and doxa meaning practices or teachings. An understanding of his use of allodoxia can equip artists with a tool to map pre-allodoxic tactical actions for unfolding allodoxic interventions that target and impact upon privileged space. Such interventions can maintain and expand the commons as embedded policy and programs, rights, and community-led initiatives. The commons are theorised here not merely as a passive legacy, but as a stake to be claimed, insistently and programmatically, as a matter of collective urgency. The commons also refer to lost or new territory claimed for the protection or expansion of rights, on the one hand, and the common good and activism in general on the other.

I present several artwork examples that elucidate hegemonic social games, as well as others that demonstrating the connection between allodoxia and hegemony. These may act as access points for artists and intervention participants to understand how allodoxic interventions, as anti-hegemonic behaviour, contribute knowledge and skills to commoning processes. They may also, through the exploration and testing of tactics, help those processes gain traction and develop. These are drawn from the radical performative practice of German-born Baroness Elsa von Freytag Loringhoven (born Else Hildegard Plötz 1874–1927: henceforth Baroness Elsa) and my studio based works.

The theorisation of allodoxic art also draws from German political thinker Hannah Arendt (1906–1975), specifically her theoretical work on revolutions, which provides greater understanding of how and why we should take political actions against privileged space. As principles for allodoxic art, this work develops an analytical armature for judging the success of these tactics and to further develop these types of interventions.
REVIEW OF TOMOGRAPHIC RECONSTRUCTION METHODS OF THE IONOSPHERE USING GNSS
Authors: Prol Fabricio Dos Santos , Camargo Paulo De Oliveira 
Published: April 2018

ABSTRACT. Spatial and temporal variation of the electron density in the atmosphere makes the ionosphere a difficult region to model. A major difficulty arises due to the incomplete geometrical coverage of the Global Navigation Satellite System (GNSS) for tomographic applications, making the ionospheric tomographic system an ill-conditioned problem. Although the tomographic system is ill-conditioned, several techniques have been developed to partially overcome the problem. There is great interest in using tomographic techniques for ionospheric imaging, because it allows describing the ionosphere in terms of electron density, which is an important parameter for studying the behavior of the physical processes that occur in the upper atmosphere. In Brazil, there are additional interests in the tomographic techniques, due to the peculiar characteristics of the ionosphere and of the geomagnetic field over the region. In this direction, methods of ionospheric tomographic reconstruction are presented and discussed in this review. Particular emphasis is given to the mathematical formulation from grid-based and function-based methods and are presented some of their main advantages and limitations.Keywords: TEC, Inverse Problem, Grid-Based Tomography, Function-Based Tomography, Ionospheric Imaging. RESUMO. A variação espaço-temporal da densidade eletrônica na atmosfera terrestre torna a ionosfera uma região de difícil modelagem. A principal dificuldade no imageamento da ionosfera com o GNSS (Global Navigation Satellite System ) é devido à geometria dos satélites, pois torna o sistema tomográfico mal condicionado. Muito embora a geometria não permita solução direta do sistema, diversas técnicas foram desenvolvidas para parcialmente superar tal problema. Há grande interesse no uso de técnicas de tomografia para o imageamento da ionosfera, pois permitem descrever a ionosfera ao nível da densidade eletrônica, sendo este um importante parâmetro para compreender os processos físicos que ocorrem na alta atmosfera. No Brasil, existem interesses adicionais no imageamento ionosférico por meio de técnicas tomográficas devido às características peculiares da ionosfera e do campo geomagnético sobre a região. Neste sentido, métodos utilizados para a reconstrução tomográfica da ionosfera são apresentados e discutidos nesta revisão. Uma ênfase especial é dada para a formulação matemática dos métodos baseados em células e em funções, além da apresentação de algumas de suas principais vantagens e limitações.Palavras-chave: TEC, Problema Inverso, Tomografia Baseada em Células, Tomografia Baseada em Funções, Imageamento Ionosférico.
EFFECT OF MINERAL COMPOSITION OF CARBONATE ROCKS ON THEIR PETROPHYSICAL PROPERTIES
Authors: Ruana Silva de Sena Mábia , Agnelo Soares José 
Published: April 2018

ABSTRACT. The construction of digital models from a set of x-ray tomography images of high resolution (μCT) acquired in rock samples is an innovative technique in growing use nowadays. The objectives of this study were: demonstrate the potential of this technique to quantify mineral content of 15 carbonate rock samples from northeastern Brazil, through μCT analysis; to compare the results with the analysis of X-ray diffraction (XRD); and to evaluate the effect of this mineral composition on the petrophysical properties of these rocks. The results achieved in the simulation of the mineral composition confirmed that the analyzed carbonate rock samples are mainly composed of calcite and or dolomite. In general the XRD results confirmed the mineral composition indicated by μCT, except for amorphous minerals and those with small contents (accessory minerals). The results show the content of major minerals controlling the petrophysical properties, especially grain density and elastic velocities. However, other factors which were assessed through the analysis of μCT, also significantly affected the elastic velocities: porosity, type of porosity (if intergranular or vugular) and proportion of microporosity present in the rock. Keywords: carbonates, microcomputed tomography, mineral characterization, petrophysics, x-ray diffraction. RESUMO. A construção de modelos digitais de rochas a partir de um conjunto de imagens de tomografia de raios de x de alta resolução (μCT) é uma técnica inovadora com uso crescente atualmente. Os objetivos deste estudo são demonstrar o potencial desta técnica para quantificar a composição mineral de quinze amostras de rochas carbonáticas oriundas de bacias sedimentares do nordeste brasileiro, através da análise dos dados de μCT, comparar os resultados com as análises de difração de raios x (DRX), e avaliar o efeito da composição mineral sobre as propriedades petrofísicas dessas rochas. Os resultados obtidos na simulação da composição mineral, através de μCT, indicam que as amostras são compostas principalmente por calcita e/ou dolomita. Em geral os resultados de DRX confirmaram a composição mineral indicada por μCT, exceto para minerais amorfos e para aqueles que apresentam pequenos teores (minerais acessórios). Os resultados demonstram que os minerais principais (com teores mais elevados) controlam as propriedades petrofísicas, especialmente a densidade de grãos e as velocidades elásticas. Entretanto, outros fatores, os quais foram avaliados através da análise de μCT, também afetaram de maneira significativa as velocidades elásticas: porosidade, tipo de porosidade (se intergranular ou vugular) e proporção de microporosidade presente na rocha. Palavras-chave: carbonatos, microtomografia de raios x, caracterização mineral, petrofísica, difração de raios x.
ACOUSTIC SEISMIC WAVE ATTENUATION IN ROCKS: ESTIMATES INSTABILITIES, FREQUENCY-DEPENDENCE AND INCOHERENCES
Authors: Peláez Julián David , Montes Luis Alfredo 
Published: April 2018

ABSTRACT. Seismic wave attenuation (Q−1) values indicate relevant media properties, such as fluid content and porosity. Q−1 estimates, obtained using both VSP and conventional well log data, did not exhibit comparable trends, nor values. Whereas VSP results represent total attenuation, well log Q−1, which, theoretically, should represent scattering losses, displayed a low percentage correlation with transmission coefficients and other well logs. The influence of processing routines, chosen methodology and input parameters on Q−1-values suggests that ASR (Amplitude Spectral Ratio) and CFS (Centroid Frequency Shift) attenuation estimates should be regarded, in practical terms, as relative quantities instead of absolute ones. Seemingly incoherent negative values are frequent, nonetheless these could hold a physical meaning related to elastic amplification at interfaces. Considering that quality factor (Q) values obtained were more unstable than Q−1-values, it is advisable to report the latter. Keywords: Vertical Seismic Profiles, well logs, transmission coefficients, scattering, amplification.RESUMO. Os valores de atenuação da onda sísmica (Q−1) indicam propriedades relavantes dos meios, tais como conteúdo de fluido e porosidade. As estimativas do Q−1, obtidas usando dados de VSP e dados de poços convencionais, não apresentaram tendências nem valores comparáveis. Enquanto os resultados de VSP representamatenuação total, os resultados dos dados de poços, que teoricamente deveriam representar perdas de dispersão, apresentaramuma baixa correlação percentual com os coeficientes de transmissão e outros dados de poços. A influência das rotinas de processamento, da metodologia escolhida e dos parâmetros de entrada nos valores Q−1 sugere que as estimativas de atenuação ASR (Amplitude Spectral Ratio) e CFS (Centroid Frequency Shift) devem ser, em termos práticos, consideradas como quantidades relativas em vez de absolutas. Valores negativos aparentemente incoerentes são frequentes, no entanto estes poderiam conter um significado físico relacionado `a amplificação elástica nas interfaces. Considerando que os valores do fator de qualidade (Q) obtidos foram mais instáveis do que os valores de Q−1, é aconselhável documentar o último. Palavras-chave: Perfis Sísmicos Verticais, registros de poços, coeficientes de transmissão, dispersão, amplificação.
Tournament Incentives and Stock Price Crash Risk
Authors: Jia Ning 
Published: April 2018

SYNOPSIS
Using a large sample of U.S. public firms, I provide robust evidence that promotion-based tournament incentives, which are measured as the pay gaps between the CEO and other senior executives, are significantly and positively related to the firm's future stock price crash risk. The documented relationship is robust to controlling for corporate governance quality, and is attenuated for firms with a recent CEO turnover and for firms with more effective external monitoring. In contrast, the relationship is accentuated for firms that experience consecutive underperformance and for firms with greater opacity. Findings of this paper advance our understanding of the benefits and downsides of promotion incentives for non-CEO executives, and highlight the implications of inter-executive incentive scheme design for firm-specific stock price crash risk.
JEL Classifications: G34; G12; G30.
Scratchpad: A Private Company Business Valuation Case
Authors: DiGabriele James A. , Riley Richard A. 
Published: April 2018

ABSTRACT
Ben and Cindy Johnson have been partners in marriage and business for 20 years, jointly owning and operating Scratchpad, a software production and distribution company. In recent years the couple drifted apart, and Ben, with Cindy's agreement, has filed for divorce. The couple has also agreed that they will not work together post-divorce. As a result, the divorce settlement will include compensation to Ben for transferring his ownership interest in Scratchpad to Cindy. In this case, you will be the valuation analyst to develop the valuation of Scratchpad to support this matrimonial dissolution.
THE INTERNALIZATION OF TNC’S PRODUCTION: FINDINGS FOR UKRAINIAN BUSINESS
Authors: Vdovychenko Yuriy , Leshchenko Marina 
Published: April 2018

The article deals with mergers and acquisitions as modern strategies of TNCs internationalization. The positions of Ukrainian capital on international mergers and acquisitions’ market are explored. The peculiarities of foreign investors' activity in the different sectors of the national economy are determined. The factors preventing national companies from gaining competitive advantages on the world market are outlined.
THE MODERN PARADIGM OF PRIVATE ECONOMIC CULTURE
Authors: Krynski Andrzej , Mamanazarov Abdukhakim , Kulishov Volodymyr , Kome Abraham 
Published: April 2018

This article examines the processes of cultural development of society, the concepts and theories of the formation of the modern paradigm of economic culture, the different points of view are given regarding the nature, content and components of economic culture at the micro level, the possible ways of formation and development of private economic culture at the modern stage of society development.
Implementasi Model Siklus Belajar (Learning Cycle) Untuk Meningkatkan Kualitas Proses dan Hasil Pembelajaran Mengelas Dengan Gas Metal Siswa Kelas XII Sekolah Menengah Kejuruan Negeri 3 Makassar
Authors: -- Nulaela , Tawil Muh. , Bambang Lukman , M Abbas , Tamaluddin Lukman , Rani Syahril Ramli 
Published: April 2018

This action research aims to implement the Learning Cycle model to improve the quality of the learning process and learning outcomes with the gas metal welding class XII students in SMK 3 Makassar. Research problems are (1) how to get through the learning cycle model can be improved with the learning process gas metal welding class XII student of SMK 3 Makassar, and (2) how to get through the learning cycle model of learning outcomes can be improved with the gas metal welding class XII students SMK 3 Makassar. The data analysis technique used is descriptive statistical analysis. The results obtained by the action is an increase in the quality of the learning process of students of class XII SMK 3 semester 2 of the cycle I to cycle II, include: (1) the better the learning activities, (2) reliability management of the learning cycle model learning of 51%, (3 ) studentsâ€™ responses to a very good learning and learning outcomes, which include (a) the product: for 47 percent (exhaustiveness of individuals) and 55 percent (exhaustiveness classical), (b) affective aspects of 30 percent, and (c) 60 percent of psychomotor aspects. Thus to implement the Learning Cycle model can improve the quality of the learning process and learning outcomes with the gas metal welding class XII student of SMK 3 Makassar.Â ABSTRAKÂ Penelitian tindakan ini bertujuan mengimplementasikan model Siklus Belajar untuk meningkatkan kualitas proses pembelajaran dan hasil belajar mengelas dengan gas metal siswa kelas XII di SMK Negeri 3 Makassar. Masalah penelitian adalah 1) bagaimana cara agar melalui model siklus belajar dapat ditingkatkan proses pembelajaran mengelas dengan gas metal siswa kelas XII SMK Negeri 3 Makassar, dan 2) bagaimana cara agar melalui model siklus belajar dapat ditingkatkan hasil belajar mengelas dengan gas metal siswa kelas XII SMK Negeri 3 Makassar. Teknik analisis data yang digunakan adalah analisis statistik deskriptif. Hasil penelitian tindakan yang diperoleh adalah terjadi peningkatan kualitas proses pembelajaran siswa kelas XII semester 2 SMK Negeri 3 dari siklus I ke siklus II, meliputi: 1) aktivitas belajar semakin baik, 2) reliabilitas pengelolaan pembelajaran model siklus belajar sebesar 51%, 3) respon siswa terhadap pembelajaran sangat baik dan hasil belajar, yang meliputi (a) produk: sebesar 47 persen (ketuntasan individu) dan 55 persen (ketuntasan klasikal), (b) aspek afektif sebesar 30 persen, dan (c) aspek psikomotor 60 persen. Dengan demikian dengan mengimplementasikan model Siklus Belajar dapat meningkatkan kualitas proses pembelajaran dan hasil belajar mengelas dengan gas metal siswa kelas XII SMK Negeri 3 Makassar.Â