bluuebunny/crossref_metadata_2025 huggingface dataset:
High Assurance on Barrier Placement and Evaluation for Deepwater Wells in Brazil
Authors: Reveth V. , Ortuno G. C. , Bersaas K. M. , Escalante J. R. , Barron J. , Moretti F. , Antunes A. D.
Published: March 2017

In a Deepwater well off the Brazilian coast which presented a complex architecture with multiple drilling casings and liners, losses were expected during cement placement across a carbonate formation. This paper describes the use of a new real time monitoring and evaluation tool which takes the data acquired during the cement placement, then processes and simulates in real time to provide important job parameters such as estimation of fluid interface positions inside the casing and annular space, pressure match chart, density quality assurance and quality control (QA/QC), ECD and dynamic well security, among others.

This manuscript present two cases history where the operator and the service company work together to define a decision tree for the possible contingencies related to unwanted TOC based on mud losses or unplanned cement placement. Later during the operation the new tool combines the design data with the cement unit and rig acquisition data to compare the job measured surface pressure, density, flowrate and volume with predicted data from simulations. Finally based on the information of real time estimation of the TOC outside the pipe and annulus space observed during the job execution a contingency from a decision tree is taken.

The cementing service company provided real-time monitoring and evaluation tool that allowed the operator to identify the estimated TOC at the end of placement. With this information, the client was able to avoid the top of liner squeeze and save 2-3 days rig time Later a cement bond log showed that top of cement was found between the liner lap confirming the barrier element. In another case it was prevented leaving unplanned cement inside the casing with the analysis of the job and simulated pressure match trends at the end of the displacement and eliminated unexpected flat times for additional drill out time.

Real-time monitoring and evaluation is a tool that can be deployed not only in Deepwater wells in Brazil, but in any section of wells being drilled around the world on land, on the shelf or in Deepwater, where the operator wants to visualize ether the deviation of job execution from job design parameters or a prompt estimation of top of cement as a first level of detection for the well barrier placement just after bumping the plug. In addition having the real time dynamic ECD will also aid in avoiding any potential well control situations (including lost circulation) during the cement operations at any time during this critical activity
Horizontal Drilling with Dual Channel Drill Pipe
Authors: Vestavik O. M. , Thorogood J. , Bourdelet E. , Schmalhorst B. , Roed J. P.
Published: March 2017

Drilling of long horizontal wells is subjected to challenges, such as hole cleaning, drill string torque and drag, and challenges related to the Equivalent Circulating Density (ECD). Where the window for the downhole pressure is small, the length of the open hole section is limited by the dynamic ECD. The result is that several liners or casing strings may be required to reach the target depth.

The Reelwell Drilling Method provides a new solution for above mentioned challenges, incorporating a dual drill string, with a separate channel for the return fluid from the well. This arrangement enables Managed Gradient Drilling, i.e. to drill with a constant downhole pressure gradient that can be controlled to be nearly independent of the flow rate. The solution is similar to Managed Pressure Drilling, however, differs in that the downhole pressure gradient is managed instead of the pressure at one depth in the well. In addition, this new method of ECD control provides efficient hole cleaning at low flow rates, and enables torque and drag reduction due to buoyancy of the drill string.

A shallow horizontal trial well was drilled onshore Alberta, Canada, March 2016, to verify the new technology. New drilling equipment, including a newly designed aluminum dual drill string was used. New drilling procedures were employed, including the new Heavy Over Light drilling fluid solution. The equipment and procedures successfully verified the key benefits of the technology: –Managed Gradient Drilling with ECD eliminated by near static well annulus fluid.–Torque and drag reduction resulting from the drill string buoyancy effect.–Efficient hole cleaning at low flow rate, due to return flow inside the dual drill string.

In the following sections, we describe the technology, how the field trial was organized and present drilling data from the shallow horizontal drilling operation that confirmed the capabilities of the system.
Minimization of Downhole Tool Failures Using Nash Equilibrium and Downhole Data
Authors: Jiang Wanyi , Samuel Robello
Published: March 2017

Complex and expensive downhole tools have been increasingly employed in modern drilling. Downhole tools may fail and result in a reduction in the rate of penetration (ROP), repair or replacement of the damaged tools, wasted trips, and rig downtime, which can substantially add to the drilling cost. The causes of downhole tool failures are compound, ranging from material, quality, and design to operating conditions. Accurate modeling and prediction of downhole tool failure may be useful for tool maintenance, preventive measures, and the determination of optimal operation windows to avoid downhole tool failures and mitigate damages.

The risk of tool failure as well as the drilling cost may be evaluated simultaneously. To model these two objective functions, a two-player, non-zero-sum game theory model is proposed. In the game theory model, the first player takes actions, such as drilling operations, to maximize his/her payoff in terms of ROP, while the second player tries to reduce the probability of tool failure as much as possible. The payoff tables in terms of ROP and tool reliability have been constructed respectively. Based on the payoff tables, the Nash equilibrium (i.e., optimal strategies) has been determined.
Torsional Drillstring Vibration Modelling and Mitigation with Feedback Control
Authors: Pehlivantürk Can , Chen Dongmei , van Oort Eric
Published: March 2017

Existing controllers that are used in the field to reduce stick-slip induced torsional vibrations have certain shortcomings, especially when it comes to higher order dynamics. This paper proposes a feedback controller based on frequency-domain loop-shaping techniques for torsional vibration mitigation in drillstrings.

The new feedback controller is designed such that the closed-loop system is stable with adequate gain margin for robustness. As a proof of concept, a 35 degree of freedom lumped mass drill string laboratory testbed was developed that utilizes precision inertial masses and a state-of-the-art motion tracking system. The physical testbed is used to tune and verify the mathematical model upon which feedback controller is built. The controller is also tested on the physical testbed.

Using the physical testbed, the performance of the controller is compared with the existing techniques that are applied in the field, such as the Soft Torque Rotary System. Significant performance increases are observed. The closed loop system with the proposed controller exhibits much less bit velocity increase after a stick phase, which is thought to be one of the main contributing factors to bit and bottom-hole assembly (BHA) damage. The controller also effectively mitigates the self-excited vibrations during drilling speed changes.

Frequency-domain loop-shaping techniques are applied extensively in the Aerospace field. However, it is not yet applied in drilling. The main contribution of this paper is the introduction of this new methodology of developing high performance feedback controllers for stick-slip mitigation. From an operational perspective, the effective elimination of unwanted bit velocity increase would significantly reduce bit damage and off-bottom time, and in turn improve drilling performance.
Application of Deep Directional Resistivity Reservoir Mapping Tool on Arctic Field Development – Case Studies from the Goliat Field in the Barents Sea
Authors: Gianbattista Tosi , Wang Haifeng , Denichou Jean-Michel
Published: March 2017

The Goliat field development is challenging because of its extreme and remote environment in Barents Sea. The field consists of two separate main reservoirs, Realgrunnen and Kobbe, both having complex structural setting with a high number of faults and considerable reservoir heterogeneity. In order to maximize production, producer wells usually navigate through several sand sequences. In addition, proximity to oil-water-contact (OWC) in the Kobbe formation has to be considered to avoid early water break through.

Eni Goliat team selected deep directional resistivity reservoir mapping LWD technology for geosteering and detecting payzone remotely. Being able to map multiple formation layers away from the wellbore, the service helped G&G team to optimize well paths during drilling to achieve the target sand exposure in the different sequences.

The results presented here on both the Realgrunnen reservoir and Kobbe reservoir were excellent. The producer well C was successfully geosteered in the upper sands in Realgrunnen reservoir, achieving a NTG of 70% despite the presences of subseismic scale faults and lateral facies heterogeneities along the well.

For the producer well E in the Kobbe reservoir, although the well was landed deep and close to OWC because the top reservoir came 11 meter deeper than prognosis, the accurate mapping of the top reservoir, OWC, and optimizing the well path, helped to support the decision to build aggressively and level out at optimal TVD, achieving 340 meters in the Kobbe 9 sand.

This communication will present also how cautious and in-depth evaluation, extensive pre-drilling study and operation planning enabled efficient geosteering of the horizontal producers in this challenging environment and maximizing productivity delivered. Post drilling, the mapping of the reservoir structure and fluid contacts were used as inputs to the static model and integrated into future development plans.
Remote Toe Isolation in ERD Wells Using an RFID-Actuated Circulating Toe Sleeve CTS A case study
Authors: Vázquez Karina , Murdoch Euan
Published: March 2017

One of the main challenges in the oil industry is to reduce well intervention costs. This paper will explain the planning and execution of an application in the Middle East in which Radio Frequency Identification (RFID) technology has been incorporated into a Circulating Toe Sleeve (CTS) to close and operate the tool remotely. Using the remotely activated CTS tool eliminates the need for additional intervention equipment and subsequently reduces the operational cost and risk involved in isolating and testing liners in Extended Reach Drilling (ERD) wells.

The remotely activated CTS will be located at the toe of a plugged Pre-Perforated Liner (PPL). The RFID CTS tool will be run open so that the liner can be circulated in. When the liner assembly is at the desired depth, it will be activated either by circulating RFID tags to the tool or allowing a timer to elapse. Once the CTS has been closed, it will prevent communication between the liner and the wellbore, thereby functioning as a barrier and allowing the liner assembly to be pressure tested.

The use of a standard circulating toe sleeve to provide liner isolation would typically result in significant costs and risks for the operator. These could be incurred in intervention time, additional service personnel on location, and budgeting for the risks associated with intervention. In ERD applications it may not be technically possible to provide an intervention solution to all parts of the well, especially the toe section. The use of a remotely activated CTS can reduce all of these considerations and make ERD wells economical and technically feasible. The potential savings this technology can bring increase by an order of magnitude when applied offshore/subsea.
Successful Multi-Well Deployment of a New Abandonment System for a Major Operator
Authors: Stokkeland Thore Andre , McNicol Jim , McWilliam Gary
Published: March 2017

Service companies were challenged by a major operator to come up with a solution to set a barrier against the overburden and to circulate oil based mud out of the annulus between the 10-3/4 in. and 13-3/8 in. casings before pulling the wellhead. The most common industry solution to this challenge is to cut the 10-3/4 in. casing by the 13-3/8 in. shoe and pull the casing to surface. An innovative new downhole tool based abandonment system was developed and successfully deployed to meet this objective.

The first stage of the operation was to run a perforation gun loaded with one foot of 18 shots per foot of a proprietary abandonment charge (single casing perforation gun) to just below the wellhead at 475 ft. Then perforate the 10-3/4 in. casing with 0.8 inch diameter holes without damaging the 13-3/8 in. casing behind, to create a circulation path.

The second stage was to run a V0 rated Retrievable Bridge Plug, RBP, with another one foot long perforation gun below. Set the V0 rated RBP and perforate just above the 13-3/8 in. shoe at 2,300 ft. then establish circulation up to the shallow perforations above and circulate out the oil based mud in the 10-3/4 in. by 13-3/8 in. annulus above. After the circulation parameters were established, a wash pill was pumped around the annulus to clean out all the oil based mud.

The third step was to set the actual overburden barrier in both the A and B annulus. This was done by displacing cement through the ball valve of the V0 rated RBP into the perforations below the RBP; placing the cement plug below and into the 10-3/4 in. × 13-3/8 in. annulus. The ball valve was closed and a cement plug was pumped on top of the RBP completing the barrier. The barrier was verified by pressure testing through the shallow perforations to 1,000 psi above the seawater gradient. A barrier was in place in both A and B annuli.

This procedure was deployed on four wells for a major operator on the Leadon South Field in the North Sea with great success. The operations were flawlessly executed with each well taking less than 18.5 hours to secure. The successful operation saved the major operator considerable time and expense by eliminating the need for cutting and pulling the 10-3/4 in. casing to get the oil based mud out of the annulus before removing the wellheads.

This paper provides an overview of the innovative new abandonment system elements and describes the successful deployment operation in detail.
API Specification 16 RCD Demystifying Rotating Control Device Manufacturing Specifications for Operations
Authors: Dow Blaine , Kamps Charley , Cremer Justin , Conn John , Mettai Adel
Published: March 2017

Objective/Scope

The rotating control device is an integral piece of equipment for managed pressure and underbalanced drilling applications. In 2005, a joint IADC/SPE committee, collaborating with American Petroleum Institute, authored specification guidelines first published as API-16 Specification RCD (API-16 RCD). Does applying a manufacturing specification as a control for operations really minimize risk, or does it limit liability? This paper will outline the journey toward API-16 RCD certification, gaps identified between testing results and operating guidelines, and methodology applied to field performance data to bridge test data with real-life performance expectations.

Method/Procedure/Process

Analysis of a large laboratory test data set has been accumulated for the API-16 RCD application process. Meanwhile, a much larger data set of field performance has been accumulated over several years from live operations throughout the world.

In an effort to seek continuous performance improvement, interrogating the data to determine a proper base line for performance was initiated. It became apparent that determining this base line was challenging, given the wide range of variables. However, through systematic data analytics, along with improved field data capture guidelines, normalizing these variables enabled operating data to validate performance inferences drawn from the existing lab data.

Results/Observations/Conclusions

Several hundred field runs were compared against more than 50 independent lab tests to determine links. Through comprehensive data analysis, along with acknowledgement of the scientific limits understanding elastomer performance over conditions and time, RCD testing in the lab is better able to predict field performance, serving as a suitable alternative to costly fit-for-purpose field simulation testing. Additionally, this methodology better guides technology improvements required to expand performance criteria.

Novel/Additive Information

Replicating field conditions in controlled laboratory tests requires a significant range of variables beyond RPM, temperature and pressure. For example, field failures have resulted from chemical factors such as mud compatibility at a range of temperatures, or physical factors such as drillpipe condition and rig alignment. Some in industry view fit-for-purpose testing as a solution, but this can become cost prohibitive for service providers and operators alike. This paper will document viable alternatives.
Efficiency Improvement in the Bakken Realized Through Drilling Data Processing Automation and the Recognition and Standardization of Best Safe Practices
Authors: Duffy W. , Rigg J. , Maidla E.
Published: March 2017

Technological advancements continuously change in the oil and gas industry and shape drilling performance. Trends point toward increased automation at the rig but there will likely always maintain an element of human touch. By incorporating an automated drilling state detection monitoring service, best-safe-practices were identified and standardized, allowing for a significant increase in rig efficiency.

A best-safe-practices initiative was implemented that included the following process:

Rigorous measurement of rig activities: A third-party service carefully quality-controlled the data feed and automatically determined the rig state. Rigorous measurement of human activity: The rigs' activities were transformed into meaningful performance information on individual crews following a data classification process and aggregation of rig operations. Recognition of safe working rates: The performance data provided by the monitoring service identified the most consistent and efficient crews to help observe their methods and share with the other crews. A teamwork environment: Involvement of stakeholders to help produce actionable plans with clear accountabilities Transparency: Sharing of the measurements with all stakeholders, including the drilling contractor, to further improve the process Safety first: Through transparency and a no-blame culture, it was possible to identify actionable items, such as new processes and additional personnel training.

The following case study focuses on the Weight to Weight (W2W) connection time during drilling operations and dissects these activities to reveal identified improvement opportunities. Efforts resulted in a savings of more than 11.75 days on a single pad of nine wells drilled by the same rig and a 45-percent improvement in overall non-drilling time.
Automated Trend-Based Alerting Enhances Real-Time Hazard Avoidance
Authors: Mickens Roscoe , Kumar Dev , Smith Gregory , Cheatham Curtis
Published: March 2017

A method is presented to efficiently analyze drilling data using trend analysis to predict downhole hazards and allow proactive decision making. The workflow is a data-driven process that provides analysis on both real-time (RT) and historical drilling events. For RT application, the method provides the user with an alert functionality prior to the hazardous events occurring. This method is designed to augment the Real-Time Operation Center (RTOC) to provide additional layers of real-time predictive capabilities, historical hindsight, situational awareness, and hazard avoidance. A software program has been developed to incorporate the methodology into a real-time workflow.

The core tenet of drilling hazard management (DHM) is process awareness, which is more relevant than ever in the industry. Routine activities such as daily drilling reports (DDR) analysis and manual RT data analysis such as planned versus actual (PVA) data are time consuming and not very efficient because they are highly dependent on the skill sets and experience of the personnel. By using a standardized automated trend analysis, time- or depth-based data can be analyzed to determine the risks and downhole hazards involved in the drilling and completion operations.

This paper presents on-bottom analysis on historical wells to show how trend deviation is used to identify potential hazards before they occur. The trend analysis uses percent deviation for specific parameters, such as standpipe pressure, surface torque, flow rate and hookload, to alert the user when thresholds for normal operations have been exceeded. This logic was developed and validated using more than 50 wells throughout the world, and the logic's thresholds were calibrated from these test cases. Alerts are triggered only when criteria for specific hazards are met.

This method champions hazards avoidance through prevention and ultimately reduces noproductive time (NPT) in well construction. This system enables efficient and standardized DHM for both real-time and historical analysis. The proactive approach in hazard avoidance helps users to be aware of trend deviation in real-time and increases the user's situational awareness through alerts. The software provides audit capabilities through documenting time-stamped acknowledgment or notes from users. This system also enables faster offset well analysis and supplements real-time data engineers to improve overall efficiency. In this paper you will see real results of how the program performed in a blind testing environment. Results from the test case demonstrate that the program can generate useable alerts well before a potentially hazardous event. The alerts prior to hazardous events could improve situational awareness for rig staff and on-site engineers.
Recorded Dynamics Measurements While Coring Enhances Performance and Recovery
Authors: Jones Steve , Sugiura Junichi , Wood Howard
Published: March 2017

Measurement of downhole dynamics while drilling has become commonplace. However, the use of sensors to measure downhole dynamics while coring has rarely been exploited. This paper will detail the use of compact dynamics sensors strategically placed within the coring assembly. A unique 4" (core diameter) jam mitigation device provides two jam protection, significantly improving core quality and reducing the total economics of obtaining whole core samples. At the occurrence of a core jam, two telescoping liners deploy within the aluminum inner barrel, allowing the ability to mitigate the core jam(s) and continue with coring operations.

Compact downhole dynamics data recorders are strategically embedded in the core hanger (non-rotating) and near-bit stabilizer directly behind the core head (rotating). The data recorders are fitted with 3-axis vibration, 3-axis shock, 3-axis gyros and two temperature sensors. Measurements include shock, vibration, rotation speed (angular velocity in RPM), torsional oscillation, stick-slip and temperature.

The sensors have been deployed on multiple coring applications throughout North America Land (NAL). The data recovered revealed formation related coring dynamics response while transitioning through interbedded intervals. Certain formations produced very high shock and vibration levels that could potentially cause damage to core quality and equipment. The onset of shock and vibration also revealed a significant temperature rise above bottom-hole temperature due to the coring dysfunctions.

This paper will detail the coring dynamics data captured from the sensors. The dynamic response of a coring assembly is significantly different from that of a drilling assembly due to the assembly mechanical dimensions and rock recovery methods. Proprietary software was utilized to merge downhole dynamic recorder data and surface Electronic Drilling Recorder (EDR) data. The software provides a fast and efficient interface to view the merged data, allowing surface and downhole correlation of the information.
Anaphylactic shock secondary to teicoplanin
Authors: Warrener Tim , Southall Paul , Kapur Sandeep
Published: March 2017

We describe a case of anaphylactic shock secondary to the glycopeptide antibiotic teicoplanin. A 35‐yr‐old female presented for a urological procedure due to complications following a previous gynaecological procedure. She reported an allergy to co‐amoxiclav and was therefore given teicoplanin as per our hospital protocol. This precipitated profound anaphylactic shock requiring admission to the intensive care unit. Subsequent immunological testing confirmed teicoplanin as the precipitant. Teicoplanin is only rarely associated with anaphylaxis, however it should be considered in patients suffering from a life‐threatening allergy.
TEORI INVISIBLE HAND ADAM SMITH DALAM PERSPEKTIF EKONOMI ISLAM
Authors: KAP Rustam Dahar
Published: March 2017

Adam Smith, the founder of modern economics, laid the basic foundation for economic development through the capitalist system in which capital factor used to measure economic success. One of his theory, the theory of invivisble hand, states that in economic activity every individual has full
authority of his property and free to use economic resources in ways that he or she likes, disregarding to the interests of the general public. This shows that capitalism has the unlimited personal ownership right toward means of production, in which the driving force is personal profit. Basically,
Islam brings the teachings to human life that comes from the Koran and Hadith. Economic activity in the view of Islam is the life demand. Besides, it is also a suggestion that has a dimension of worship. Wealth is trustworthy, thus the mandate that God has bestowed to be used together, not to enslave other people. Islam allows every person to own property in person, but it is also enjoined on his or her property to be used collectively (together), alms or spend a portion of such property in Allah ways. Economic activity in the view of Islam is not only material but more than
what is called “material plus”. Islam has always stressed that every person should lives in a lawful manner. Islam does not prohibit people to do economic activity, but it provides guidances in the form of Islamic values.
ANALISIS RASIONALITAS INVSETOR DALAM PEMILIHAN DAN PENENTUAN PORTOFOLIO OPTIMAL PADA SAHAM-SAHAM JAKARTA ISLAMIC INDEX
Authors: Rifqiawan Raden Arfan
Published: March 2017

The purpose of this study is to determine whether investor rationality exist in undergoing the stock choice in Jakarta Islamic Index at Indonesia Stock Exchange. The chosen populations in the study are 44 firms listed on JII. However, the samples are only 19 firms that present 30 times consecutively of simultaneous monitoring on JII. From 19 firms after being analyzed with single index model, there are 11 firms have ERB > Ci*, it means if investor invests in 11 stocks will get return higher with lower risk in comparison with investment in free risk asset. Data which is used, is the
secondary one and collected from Indonesia Stock Exchange Monthly Statistic and free risk rate report from Central Bank of Indonesia. The result demonstrates on empirical evidence of investor rationally in choosing the stock on JII. The value is showed averagely by stocks trade volume that has ERB > Ci* higher than averagely stocks trade volume that has ERB< Ci*.
PENGARUH STRATEGI EKSKLUSIF TERHADAP KINERJA LEMBAGA KEUANGAN SYARI’AH
Authors: Mujibatun Siti
Published: March 2017

This study aims to analyze the marketing performance of Sharia Financial Institutions (LKS) and obtain empirical evidence and find clarity about the effect of Exclusive Strategic on marketing performance of Sharia Financial Institutions by focusing the research on (Arta Surya Barokah Bank, Semarang and Asad Alif Bank, Sukorejo, Kendal). Formally, the contribution of this research is expected to provide contributions to the development of science in the field of Islamic Economics and practically to improve the marketing performance of Sharia Financial Institutions both in terms of fund raising and in its distribution, so that by the year 2010, the target planned by the Bank of Indonesia to obtain 5% of total assets accessed by a conventional bank can be achieved.
This research is quantitative by using questionnaire method. While the hypothesis test conducted is based on computing a simple regression analysis. The finding of this study is the absence of significant influence of Exclusive Strategies to increase marketing performance of Sharia Financial Institutions at Arta Surya Barokah Bank Semarang and Asad alif Bank Sukorejo Kendal in 2009, therefore both banks are expected can improve the marketing performance of Sharia Financial Institutions by changing the paradigm of its model in offering product to be more inclusive and familiar with the language that is comprehensible by stakeholders, as a esult it can offset the conventional financial institutions, especially in product of financial marketing.
Pelos "cantos" da cidade: usos e apropriações dos espaços por trabalhadores de rua no Centro de João Pessoa, Paraíba
Authors: Moura Alessandra Soares , Scocuglia Jovanka Baracuhy Cavalcanti
Published: March 2017

Este artigo trata das experiências espaciais e socioculturais vinculadas ao trabalho informal nas ruas do Centro da cidade de João Pessoa, Paraíba, Brasil. É parte dos resultados das pesquisas realizadas em 2014 durante um mestrado no Programa de Pós-Graduação em Arquitetura e Urbanismo, da Universidade Federal da Paraíba (PPGAU/UFPB). Ele representa um esforço de aprofundamento teórico-metodológico do debate acerca da cidade contemporânea e suas dinâmicas socioespaciais. O foco da pesquisa são as formas de produção e reprodução dos espaços públicos atravessados pela diversidade de usos e pelas apropriações que os citadinos neles imprimem por meio de suas práticas e representações cotidianas. O objetivo principal deste artigo é problematizar, a partir da análise de experiências cotidianas de trabalhadores de rua, alguns conflitos contemporâneos no espaço urbano, pondo em debate a experiência urbana, compreendida na relação entre prática cotidiana e urbanismo.
Frontiers and economic institutions in Brazil: an approach focused on the new institutional economics
Authors: Carvalho André Cutrim
Published: March 2017

The present article seeks to discuss the meaning (s) of frontiers in Brazil and the role of institutions in the process of economic development through the new institutional economics. Any pattern of collective behavior characterizes an institution, and as such determines the “rules of the game”. The frontier represents a socio-economic relationship of production because the structure of society in building a frontier is dominated (in)directly by capital. In Brazil, the movement to occupy land on the frontier does not usually occur through contingent smallholders, but rather through a mixture of different social segments, such as: migrants, “landless” males, farmers and entrepreneurs, all seeking land to occupy, to produce and to speculate. The main conclusion is that a developed institutional system may help to promote economic development by structuring the surrounding environment and stimulating the process of cooperation, innovation and learning in the frontier regions of Brazil.
Do Sudeste da Amazônia Legal ao Centro Norte: as transformações econômicas espaciais
Authors: Oliveira Thiago José Arruda de , Piffer Moacir
Published: March 2017

Este artigo analisa o processo de transformação econômica do Centro Norte, tendo como ponto de referência a Amazônia Legal. Segue-se com a premissa de que uma região altera a sua configuração espacial a partir de uma base econômica. Para isso, revisa-se a trajetória histórica desta delimitação geográfica e, em seguida, com o auxílio do Quociente Locacional (QL), observa-se o desempenho locacional de suas atividades produtivas entre 2000 e 2010. Os resultados apontam que o Sudeste da Amazônia Legal, a partir do final do século XX, assume a função de uma Região Produtiva do Agronegócio (RPA) e, com isso, desagrega-se do contexto amazônico, originando o Centro Norte. Essa afirmação tem como base os resultados do QL, que mostram o avanço das atividades primárias nos municípios pertencentes a esse recorte, enquanto que as demais produções se concentraram no ínterim analisado.
ANPUR: articulação acadêmica na construção de agendas de pesquisa, de ensino e de política científica, urbana e regional, 2009-2011
Authors: Dias Leila Christina
Published: March 2017

Texto de memória da gestão da Diretoria da ANPUR do biênio 2009-2011, presidida pela professora Leila Christina Dias (UFSC).
Legitimidade institucional e (des)ordem fundiária urbana
Authors: Silva Eliane Alves da , Rodrigues Herbert
Published: March 2017

Este artigo discute as recentes políticas e práticas de reassentamento urbano empenhadas pelo poder público na cidade de São Paulo, Brasil. O principal objetivo consiste em explorar os conceitos de legitimidade institucional, justiça procedimental e compliance em relação às práticas do Estado. Inicialmente, apresentamos a legislação de regulamentação do uso do solo urbano, as políticas públicas de moradia e as ações do Estado realizadas por diferentes órgãos e agentes públicos. Em seguida, e como estratégia narrativa, mostramos cenas empíricas retiradas de pesquisa etnográfica, objetivando expor a natureza arbitrária dos processos de reassentamento. No caso do reassentamento urbano, concluímos que há inversão no papel assumido pelo Estado, que gera desordem e viola o direito fundamental à habitação, em vez de criar o ordenamento da política habitacional, conforme previsto na Constituição brasileira.
Editorial
Authors: Fernandes Ana Cristina , Lacerda Norma , Gonçalves Tiago Cargnin
Published: March 2017

Editorial - Volume 19 | Número 1 (jan./abr. 2017).
Effort estimation in global software development - a systematic review
Authors: Wickramaarachchi Dilani , Lai Richard
Published: March 2017

Global Software Development (GSD) is becoming increasingly prevalent, with software development teams being distributed around the world and working in collaboration with partner companies despite geographic and time differences. The main advantage of GSD which makes it attractive is the greater availability of human resources at lower costs. However, there are several disadvantages which are caused by the distance which separates the development teams. Coordination and communication become more difficult when the software development teams are located in different places, resulting in hidden costs involved in this process. As such, the effort estimation models used for collocated software development are inadequate for estimation in GSD. Thus, effort estimation in GSD is becoming an important area of research. Many researchers have focused on effort estimation in GSD over the last decade. This paper presents the findings of a systematic review of the related literature by summarizing the hidden costs in GSD, and discussing the open research issues in effort estimation in GSD.
Conjugate connections with respect to a quadratic endomorphism and duality
Authors: Bejan Cornelia-Livia , Crasmareanu Mircea
Published: March 2017

The goal of this paper is to consider the notion of conjugate connection in a
unifying setting for both almost complex and almost product geometries,
having as model the works of Mileva Prvanovic. A main interest is in
finding classes of conjugate connections in duality with the initial linear
connection; for example in the exponential case of almost complex geometry
we arrive at a rule of quantization.
On connectedness of the set of efficient solutions for generalized systems
Authors: Rahimi M. , Farajzadeh A.P. , Vaezpour S.M.
Published: March 2017

In this paper, we first give a density theorem. We will see that, under some
suitable conditions, the set of positive proper efficient solutions is dense
in the set of the efficient solutions. Finally, we discuss about the
connectedness for the set of the efficient solutions of a generalized system.
Spectral radius and traceability of connected claw-free graphs
Authors: Ning Bo , Li Binlong
Published: March 2017

Let G be a connected claw-free graph on n vertices and G? be its complement.
Let ?(G) be the spectral radius of G. Denote by Nn?3,3 the graph consisting
of Kn?3 and three disjoint pendent edges. In this note we prove that: (1) If
?(G) ? n ? 4, then G is traceable unless G = Nn?3,3. (2) If ?(G?) ? ?(Nn?3,3)
and n ? 24, then G is traceable unless G = Nn?3,3. Our works are
counterparts on claw-free graphs of previous theorems due to Lu et al., and
Fiedler and Nikiforov, respectively.
Negative dependence for fuzzy random variables: Basic definitions and some limit theorems
Authors: Ahmadzade H. , Amini M. , Taheri S.M. , Bozorgnia A.
Published: March 2017

The concept of negative dependence for fuzzy random variables is introduced.
The basic properties of such random variables are investigated. Some results
on weak and strong convergence for sums and weighted sums of pairwise
negatively dependent fuzzy random variables are derived. As a direct
extension of classical methods, some limit theorems are established based on
the concept of variance and covariance.
Existence of positive periodic solutions in shifts δ± for a nonlinear first order functional dynamic equation on time scales
Authors: Çetin Erbil , Topal Serap
Published: March 2017

Let T ? R be a periodic time scale in shifts ?? with period P ? [t0,?)T. In
this paper we consider the nonlinear functional dynamic equation of the form
x?(t) = a(t)x(t)- ?b(t) f (x(h(t))), t ? T. By using the Krasnoselski?,
Avery-Henderson and Leggett-Williams fixed point theorems, we present
different sufficient conditions for the nonexistence and existence of at least
one, two or three positive periodic solutions in shifts ?? of the above
problem on time scales. We extend and unify periodic differential, difference,
h-difference and q-difference equations and more by a new periodicity concept
on time scales.
The short-time Fourier transform of distributions of exponential type and tauberian theorems for shift-asymptotics
Authors: Kostadinova Sanja , Pilipovic Stevan , Saneva Katerina , Vindas Jasson
Published: March 2017

We study the short-time Fourier transform on the space K01(Rn) of
distributions of exponential type. We give characterizations of K01(Rn) and
some of its subspaces in terms of modulation spaces. We also obtain various
Tauberian theorems for the short-time Fourier transform.
Application of measure of noncompactness for the system of functional integral equations
Authors: Arab Reza
Published: March 2017

In this paper we introduce the notion of the generalized Darbo fixed point
theorem and prove some fixed and coupled fixed point theorems in Banch space
via the measure of non-compactness, which generalize the result of Aghajani
et al.[6]. Our results generalize, extend, and unify several well-known
comparable results in the literature. As an application, we study the
existence of solutions for the system of integral equations.
Multiobjective programming under nondifferentiable G-V-invexity
Authors: Antczak Tadeusz
Published: March 2017

In the paper, new Fritz John type necessary optimality conditions and new
Karush-Kuhn-Tucker type necessary opimality conditions are established for
the considered nondifferentiable multiobjective programming problem involving
locally Lipschitz functions. Proofs of them avoid the alternative theorem
usually applied in such a case. The sufficiency of the introduced
Karush-Kuhn-Tucker type necessary optimality conditions are proved under
assumptions that the functions constituting the considered nondifferentiable
multiobjective programming problem are G-V-invex with respect to the same
function ?. Further, the so-called nondifferentiable vector G-Mond-Weir dual
problem is defined for the considered nonsmooth multiobjective programming
problem. Under nondifferentiable G-V-invexity hypotheses, several duality
results are established between the primal vector optimization problem and
its G-dual problem in the sense of Mond-Weir.
Some fixed point results of single-valued mapping for c-distance in tvs-cone metric spaces
Authors: Dubey Anil , Mishra Urmila
Published: March 2017

The purpose of this paper is to prove some fixed point theorems in a tvs-cone
metric space using c-distances. The presented theorems extend, generalize
and improve the corresponding results of Fadail et al. [10], Dordevic et al.
[8] and the results cited therein under the continuity condition for maps.
In the last section we give an examples in support of our theorems.
Generalized inverses of a linear combination of Moore-Penrose hermitian matrices
Authors: Misic Milan , Tosic Marina , Popovic Zoran
Published: March 2017

In this paper we give a representation of the Moore-Penrose inverse and the
group inverse of a linear combination of Moore-Penrose Hermitian matrices,
i.e., square matrices satisfying Ay = A. Also, we consider the invertibility
of some linear combination of commuting Moore-Penrose Hermitian matrices.
Fog Index dan Keterbacaan Berita Utama (Headline) Suara Merdeka 03 Mei 2013
Authors: Sareb Putra R. Masri
Published: March 2017

Keterbacaan dapat diukur dengan berbagai variable. Variabel yang paling utama adalah bagaimana jumlah huruf, jumlah kalimat, dan kata-kata sukar yang disesuaikan dengan latar belakang dan tingkat pendidikan pembacanya. Robert Gunning menemukan formula untuk mengukur keterbacaan yang dikenal dengan istilah The Gunningâ€™s Fog Index atau Fog Readability Formula atau Fog Index. Kemunculan rumus ini butuh proses dan tidak muncul begitu saja. Gunning menemukan media cetak di Amerika susah dicerna sehingga susah laku di pasaran. Artikel ini menggunakan formula Fox Index sebagai alat untuk membedah keterbacaan headline Suara Merdeka versi cetak terbitan 3 Mei 2013..
Jurnalisme Tabloid di Indonesia
Authors: Rahmitasari Diyah Hayu
Published: March 2017

Abstract: Many scholars have criticised tabloid journalism because it often contains drama and sensationalism. However, tabloid journalism actually cater the taste of the readers who were ignored by mainstream newspapers. This article is based on a research analyse Pos Kota and Lampu Hijau, relying on content analysis of the papersâ€™ editions in December 2011 and January 2012, as well as interviews with the editors and journalists. The analyses conclude that tabloid journalism in Indonesia is an urban phenomenon focuses on local issues and targets urban workers as their core readers and has been most successful in Jakarta and its surrounds.Abstrak: Jurnalisme tabloid merupakan terminologi yang sering diperdebatkan, dikritisi dan dicaci. Padahal, bentuk jurnalisme ini sebenarnya melayani selera pembaca yang cenderung diabaikan oleh jurnalisme arus utama. Artikel ini dibuat berdasarkan penelitian atas isi Pos Kota dan Lampu Hijau periode Desember 2011-Januari 2012, serta wawancara dengan editor dan jurnalis. Hasil analisis menunjukkan bahwa jurnalisme tabloid di Indonesia adalah jurnalisme yang fokus pada isu-isu lokal dan menyasar para pekerja urban sebagai pembaca utamanya sehingga meraih sukses di kota-kota besar terutama Jakarta dan sekitarnya.
Interaktivitas sebagai Strategi Mediated Communication pada Fans Pages Starbucks Coffee Indonesia
Authors: Boer Kheyene Molekandella
Published: March 2017

Abstract: Digital marketing increasingly becomes an option in corporateâ€™ promotional activities. Many marketers marginalize traditional advertising media and turning to the internet because it is more profitable and easier to interact with consumers. However, the concept of interactivity is one thing that has not been properly implemented. Many marketers do not know correctly how to manage interactivity with their consumers. Starbucks is one of the worldâ€™s companies which own and maintaining fans pages. Starbucks actively manage social media to advertise their products and establish interactive communication with consumers. This paper observes the interactivity occurs between Starbucks and their consumers through fans pages.Abstrak:Pemasaran digital kian menjadi pilihan dalam aktivitas promosi perusahaan dunia. Pemasar beramai-ramai meninggalkan media periklanan tradisional dan beralih ke internet karena lebih menguntungkan, mudah dan murah untuk berinteraksi dengan konsumen. Namun, konsep interaktivitas belum dapat diwujudkan dengan semestinya. Banyak pemasar belum mengetahui dengan benar bagaimana mengelola interaktivitas dengan konsumen. Salah satu perusahaan besar dunia yang masuk ke dalam ranah digital adalah Starbucks coffee. Starbucks aktif mengelola media sosial untuk mengiklankan produk-produk mereka dan menjalin komunikasi interaktif dengan konsumennya. Paper ini mencoba melihat seberapa dalam interaktivitas yang terjadi di ranah digital antara Starbucks dan konsumen.
Transformasi Fungsi Komunikator dan Fungsi Konstruksi Akun Facebook Presiden SBY
Authors: Mardjianto F. X. Lilik Dwi
Published: March 2017

Abstract: New media in a form of social media has grown rapidly nowadays. The growth of social media is supported by technological advances connected people around the world. They are connected to each other and easily exchange messages. The transformation has finally weakened the media itself. This is a concept paper combining two methodoloies, namely literature review and content analysis of Presiden Yudhoyonoâ€™s Facebook account. This paper reveals that public connectedness within digital era has brought back the media to its original function; media that has only message distribution function, without having message construction function.Â Abstrak: Media baru dalam bentuk media sosial berkembang begitu pesat. Perkembangan yang didukung dengan kemajuan teknologi tersebut telah menciptakan keterhubungan antar orang. Publik terhubung satu dengan yang lain dan saling bertukar pesan. Transformasi peran dan fungsi audiens akibat kemunculan media sosial itu berpotensi mendegradasi fungsi media. Makalah ini adalah makalah konseptual yang menggabungkan dua metodologi, yaitu studi pustaka dan analisis isi sederhana terhadap akun Facebook Presiden Susilo Bambang Yudhoyono. Makalah ini mengungkap bahwa keterhubungan publik di era digital adalah masa ketika media kembali kepada fungsi awalnya, hanya sebagai perantara distribusi pesan, tanpa lagi dilengkapi kemampuan untuk mengemas atau mengonstruksi makna.
Media Sosial dan Peran Manajerial Public Relations PT PLN Persero
Authors: Prastya Narayana Mahendra
Published: March 2017

Abstract: Social media affect communication technicians and managerial roles in Public Relations (PR). This study observes PR managerial role in PT PLN Persero in the policy making of social media use for the companyâ€™s internal environment. This research use interviews, document studies, and observation as data collection techniques. The results show that the role of communicating the policy is more dominant than the managerial role. Factors influencing PR managerial role are organizationâ€™s recognition on the PR role and function in the organization, the number of personnel in the PR department, and the authority overlap within the organization.Â Abstrak: Media sosial memengaruhi praktek Public Relations (PR) sebagai teknisi komunikasi dan manajerial. Penelitian ini membahas peran manajerial PR d PT PLN Persero dalam penyusunan kebijakan penggunaan media sosial untuk lingkungan internal perusahaan. Penelitian menggunakan metode kualitatif dengan teknik pengumpulan data wawancara, studi dokumen, dan observasi. Hasil penelitian menunjukkan bahwa Bidang Komunikasi Korporat PT PLN Persero sudah melaksanakan peran manajerial walaupun masih didominasi peran mengomunikasikan kebijakan. Peran manajerial PR dipengaruhi oleh pemahaman dan pengakuan formal organisasi terhadap peran dan fungsi PR dalam organisasi, jumlah personel di departemen PR, dan tumpang tindih kewenangan dengan bidang kerja lain dalam organisasi.