bluuebunny/crossref_metadata_2025 huggingface dataset:
Comprehensive Evaluation of the EOR Polymer Viscoelastic Phenomenon at Low Reynolds Number
Authors: Be M. , Hincapie R. E. , Rock A. , Gaol C. L. , Tahir M. , Ganzer L.
Published: March 2017

This study focuses on the investigation of the total pressure drop with regards to the shear, elongational and frictional forces experienced by the viscoelastic EOR polymers during the flow through porous media. The main analysis is performed to these forces occurring at low Reynolds numbers. Single-phase flooding experiments were conducted in Bentheimer core plugs and micromodels. Moreover, observations at pore-scale level are included by streamlines visualization analysis.

The overall approach can be summarized in the following sequence: 1) Single phase polymer flooding through Bentheimer core plugs 2) Analysis regarding the correlation between the pressure drop and the apparent flow behavior. This analysis also focuses on the contribution of shear, elongational and frictional forces to the pressure drop at low Reynolds number 3) Porescale streamline visualization experiments using micromodels 4) Analysis regarding the elastic instabilities or turbulences observed during the flow at low Reynolds number from streamline visualization experiments.

The preliminary evaluation from core flooding experiments shows a significant additional increase in pressure drop during the viscoelastic EOR polymers flow through porous media. The analysis regarding the cause of the additional increase in pressure drop indicates that shear and frictional forces are not the main determinants during the flooding process. This leads to a strong indication that the elongational forces experienced by the EOR polymers while flowing through the pores are the primary reason for the additional increase in pressure drop. A correlation between elongational forces and flow instabilities during the experiments was observed. It was also observed that at a given shear rate the onset of elasticity occurs. The onset of elasticity was evaluated by the observation of the normalized data obtained by taking the ratios between apparent and bulk viscosity.

Further evaluations from the porescale streamlines visualization experiments showed a clear occurrence of elastic instabilities during the flow at low Reynolds numbers in the form of vortices, crossing streamlines, and steadily changing flow directions of streamlines. These flow instabilities account for the additional increase in pressure drop.

This study provides a novel comprehensive evaluation approach to characterize the pressure drop observed during the EOR polymers flow through porous media with regards to their viscoelastic behavior. It should help to understand porescale polymer displacement and the contribution of viscoelastic properties on additional oil recovery. Furthermore, this paper provides evidence of the flow instabilities through visualization experiments and detailed analysis.
Significance of the Kinetics of Minerals in Reactive-Transport Problems
Authors: Khaledialidusti Rasoul , Kleppe Jon
Published: March 2017

The effect of geochemical reactions and the kinetics of minerals are not completely understood in reactive-transport problems such as low-salinity waterflooding (LSF) or alkaline/surfactant/polymer (ASP) injection method. These processes do not only act as an inert displacement and geochemistry also plays a major role in the fluid behavior and oil recovery. In this paper, first, the importance of the kinetics of minerals with fast and slow rate kinetic reactions (e.g., calcite and quartz, respectively) in different conditions during reactive-transport floods is investigated using PHREEQC geochemical package. Then, two-phase Buckley-Leverett (BL) flow is coupled with IPhreeqc which is open-source module of the PHREEQC geochemical package in order to study the effect of the geochemical reactions and the kinetics of minerals on the oil recovery in two different displacement distances. This coupling provides a simple tool for modeling the geochemical reactions to understand the effect of the geochemistry on the two-phase and 1D flow, and consequently the oil recovery. Finally, as an example, the significance of the kinetics of minerals in LSF and in oil recovery is studied at two different scales.

The results show that temperature, in-situ water composition and buffering capacity have a great impact on the kinetics of mineral. It has been shown that minerals with slow rate kinetic reaction (e.g., quartz) might be excluded in reactive-transport phenomena at core-scales. However, minerals with fast rate kinetic reactions (e.g., calcite) must be included when modeling lab results. On the other hand, the residence time at field-scales is large enough for the mineral dissolution and precipitation to affect the local equilibrium constants. Therefore, in modeling field-scale applications, local equilibrium assumption (LEA) can be applied for fast rate kinetic minerals, whereas kinetics should be used for slow rate kinetic minerals (e.g., quartz).
Evolution of pH and Retention of Different Alkali Species for ASP Flooding Field Applications
Authors: G. S. Kusumah , O. Vazquez
Published: March 2017

The era of easy oil recovery is over. One of the ways to economically improve oil production is through Enhanced Oil Recovery (EOR) implementation especially in mature field development. Alkaline-Surfactant-Polymer (ASP) flooding is considered to be the most promising EOR choice between the chemical flooding options due to its great effectiveness as result of synergy between Alkaline, Surfactant and Polymer. The main objective of this work is to analyse the pH evolution of different alkali species (NaOH, Na2CO3 and NH3) that should be used in ASP flooding application by using PHREEQC thermodynamic database software.

The work will divide the simulation into static and dynamic test. The static test will give result of pH evolution in terms of increasing alkali concentration in the brine to measure initial performance of each alkali species. The dynamic test will be used to simulate each alkali species performance in field application and involve of building a 1D reactive model that describe flow path of communication between injector and producer well in a reservoir and measures the pH evolution at the production well. This work will also use different reservoir brine and injection water composition for each test that will represent the onshore and offshore environment due to different amount of Total Dissolved Solids (TDS) of each case.

Through the result of this work it is found out that in onshore NaOH will be preferred based on its performance and cost, and as for the offshore environment case, NH3 will be more preferred based on its performance and storage size. One issue to be notice for the implementation of ASP flooding in offshore that it requires the injection water to be in low salinity and that the water treatment approach is more preferred compared to pipeline construction to provide the required injection water as it is more economical.
The Nature of Drilling Fluid Invasion, Clean-Up, and Retention During Reservoir Formation Drilling and Completion
Authors: Green Justin , Patey Ian , Wright Leigh , Carazza Luca , Saasen Arild
Published: March 2017

A reservoir-conditions coreflood study was undertaken to assist with design of drilling and completion fluids for a Norwegian field. Multiple fluids were tested, and the lowest permeability alterations did not correlate with the lowest drilling fluid filtrate loss volumes. This paper will examine the factors which contributed to alterations in the core samples.

A series of corefloods were carried out using core from 2 formations and different drilling fluids. Separate tests were carried out using drilling fluid alone and the full operational sequence. Filtrate loss and permeability measurements combined with interpretative analyses to understand what happened in the near-wellbore. Micro-CT "change maps" gave 3D visualisations of the thickness of operational fluid cakes and extent of retention/clean-up – valuable insights into factors that influence hydrocarbon recovery.

All drilling fluids tested had "normal" filtrate loss volumes, with one having notably higher losses with a particular formation. Normally this would be considered a bridging issue and "fixed", but those tests showed comparable or slightly lower alterations in permeability. Analysis showed that, despite deeper constituent infiltration, they were not contributing significant extra damage or retention; the nature of the drilling fluid attachment and cake seemed to be more relevant here than depth of invasion. Other examples will illustrate that the impact of drilling fluid infiltration and retention can range widely, and that there are more key factors than simply filtrate loss volume.

Results showed that focusing on the metric of filtrate loss alone may increase risk during drilling fluid selection. Understanding the relationship between filtrate loss, permeability/inflow alteration, retention/clean-up after production is important in selecting fluids as well as giving a better understanding of where improvements can be made. 3D visualisations of the alterations caused by drilling fluid allow conclusions to be drawn when previously there would be speculation.
Plug and Abandonment Campaigns from a Riserless Light Well Intervention Vessel Provide Cost Savings for Subsea Well Abandonments
Authors: Varne T. , Jorgensen E. , Gjertsen J. , Osugo L. , Friedberg R. , Bjerkvik O. , Halvorsen E. C.
Published: March 2017

Deployment of dedicated riserless well intervention (RLWI) vessels to perform a number of light-weight plug and abandonment (P&A) operations on subsea wells (also called pre-P&A) is now being used systematically in the North Sea as an alternative to modular offshore drilling units (MODUs). This paper describes the scope of work, project specific equipment and activities performed by RLWI vessels in preparation for the final abandonment by the MODU in two case studies, offshore Norway (Troll Osberg Gas Injection and Glitne fields). Based on the lower costs of RLWI compared to a MODU (Fjaertoft et al. 2011) and the shorter P&A operational times (Moeinikia et al. 2014), it is estimated that these case studies saved the Operator between 58.5 and 78 USD million.
Next Generation Annular Barrier Verification System
Authors: Dagestad Vibjørn , Bårdsen Johnny , Vasques Ricardo Reves
Published: March 2017

International standards for well barrier integrity traditionally prescribe cement as annular sealing material. Despite a more than 100-year long history using cementing techniques, a high number of wells have poor annular integrity and are facing sustained casing pressure (SCP). A quality assessment of the cement seal is obtained by return volume and surface pressure trend calculations together with bond logs. All of these measurements are indirect and open for interpretation. Commonly, excess cement volumes are pumped to account for uncertainties but cement failure rate remains high.

This paper describes an extensive testing and qualification program performed on a wireless downhole measurement system. Testing has been done on a component and system level basis on the permanently deployed equipment together with the hardware, software and telemetry on the equipment designed to retrieve the data. Focus has been given to robustness and simplicity to accurately capture the data of interest and ensure a fast and reliable download.

A direct measurement of annular integrity is now available. A continuous pressure and temperature measurement, named the Well Data Monitor (WDM), can be mounted on the exterior of the casing or liner. The system is non-intrusive to the tubulars and communicates by acoustics through the pipe-wall. No control lines to surface are needed. Interrogation of the sensor pack will provide a full history of events from deployment to the time of download. Hence, historical pressure and temperature data are available from the time of deployment, through the process of establishment of annular barriers to the final verification test. The verification test will provide a direct and non-negotiable measurement of integrity.

The development of the WDM was initiated following a need to provide verification for the Well Annular Barrier (WAB) to confirm to Norsok D-010 barrier requirements and to use the WAB as a barrier in open-hole.
Rathole Elimination BHA Success in Norwegian Seas
Authors: Hussain Sajjad , Huelvan Yvon , Labrousse Sebastien , Hassan Haitham Khalil , Esmat Mohamed , Dhaher Karam Sulaiman , Blackburn Jason
Published: March 2017

Rathole elimination (RHE) BHA comprised of hydraulics and ball-drop underreamer has been used in different North Sea fields. RHE success has been very important for operators in completion, cementing, casing running optimization, and handling contingencies by running intermediate liners and casings. One of the major benefits of the RHE system is time saving because the rathole is removed in the same drilling run and the dedicated underreaming run is not required. In today's field operations, this time saving has become considerably important on the older platforms as well. An RHE system has been successfully run on the North Sea continental shelf (NCS) with five different operators and in six challenging fields, resulting in significant time and cost saving for each operator. BHA and hydraulics design are the basis of these successful RHE operations. Starting from a vertical well to whipstock exits and 2D wells followed by 3D complex wells have established that the RHE system is fully directional and steering capability is not compromised by BHA complexity. Suites of applications, including the integrated dynamic design and analysis 4D platform was used for BHA optimization and stability, underreamer and bits cutting structure selection, and directional response prediction. Both push-the-bit and point-the-bit rotary steerable systems (RSS) have been used in these operations. RHE showed great success and technology maturity on NCS in various borehole sizes. This paper presents the historical run summaries and the technology maturity life cycle in the North Sea.
Innovative Remediation Techniques for Restoring Well Integrity by Curing High Annulus-B Pressure and Zonal Communication
Authors: Ansari Arsalan , Al-Azizi Badr , Larsen Arne G.
Published: March 2017

The petroleum industry has made significant investments and extensive research to rectify well integrity issues, one particular failure mode relates to the migration of hydrocarbon fluids to surface through microchannels, due to poor cementation, resulting in the inability to provide integral barriers in the 95/8" casing x 12¼" hole annulus. Section milling and external casing patches are two of the widely-utilized approaches to restore annulus integrity; however, they add complexity associated with excessive steel cuttings and re-entry risk. Remediation using Hydra System is one of the innovative approaches that can be utilized in wells to provide strong integral cement barriers behind the 95/8" production casing below the 133/8" casing-shoe to prevent reservoir fluids migrating to surface. As a consequence, the well life can be extended and the older wells can be restored back to production and injection. This approach is gaining increased popularity due to a number of economic and environmental advantages such as restoring the well production/injection with minimum workover costs and risk due to less complex operations.

The research utilizes a novel technology to execute a repair of wells with failed Annulus-B (95/8" x 133/8" casing annulus barrier) integrity by providing integral cement barriers in Annulus-B above the reservoir for wells experiencing migration of hydrocarbons from reservoir through the this casing annulus. The planned methodology starts with completion recovery followed by running noise, temperature and cement bond logs in order to evaluate the cement quality behind 95/8" casing above the reservoir.

Findings from the noise/temperature logs and oil sample evaluation indicated that oil is migrating from the reservoir, through Annulus-B, dripping at surface through the 30" conductor pipe. The cement bond logs indicate poor cement behind 95/8" casing above the reservoir. Therefore, the aforementioned remediation technology was successfully utilized as it delivers effective jet washing and subsequent cleaning of the annular space using specialized tools and thereafter spraying cement to create a 100-feet competent cement barrier behind the casings for effective isolation and the prevention of pressure communication to the surface via Annulus-B. Furthermore, a 7" short tie-back was installed over the perforated cemented interval. Hence, the 95/8" casing was re-established as a well barrier element in the well, allowing the well's injection rate to be restored.

This strategy may be developed as a very cost-effective technology as it saves the operator approximately 16-22 days and $ 1.6-2.3 million per well with associated significant CAPEX and OPEX savings by avoiding additional costs associated with complexity of operations in section milling. It is feasible to be applied in offshore wells requiring remediation of failed Annulus-B integrity as it delivers greater efficiency by reducing the rig time and the associated costs.
A Traction Tool for Liners and Sand Screens
Authors: Randeberg Erlend , Skadsem Hans Joakim , Gardner David , Stokka Sigmund , Kyllingstad Henrik , Larsen Torgeir
Published: March 2017

A traction tool has been built and tested as a part of the development of a long reach well concept. The application of the traction tool to assist the running of liners and sand screens in challenging wellbores is studied and the results and conclusions are described.

Full-scale testing of the traction unit prototype has demonstrated that it can deliver large axial forces to the string. A prototype tool for assisting during the completion phase of challenging wellbores is described, including the tool's measured performance from testing in casing.

The industry partners supporting the development work identified an opportunity to utilize the device to assist the completion operation to ensure that the target depth is reached.

Different scenarios where a traction device can provide a benefit include: Buckling of the running string in extended reach wellsInsufficient available string weight in shallow reservoirsAvoid rotating sand screens to reduce axial friction

The benefit of utilizing this tool is demonstrated by simulating the completion operation. Comparative well case studies are performed to study the completion operation, with and without the traction system included. A torque and drag model is used to estimate the mechanical forces present during the running of the completion string and these are compared to the buckling and load limits. Input parameters such as wellbore geometry, friction factors and completion string specifics are taken from relevant well examples. The operational performance for different positions of the tool in the running/completion string is also investigated.
Cement Degradation in CO2 - H2S Environment under High Pressure-High Temperature Conditions
Authors: Omosebi O. A. , Sharma M. , Ahmed R. M. , Shah S. N. , Saasen A. , Osisanya S. O.
Published: March 2017

Significant amount of oil and gas reserves contain CO2 and H2S. Leakage of these gases to fresh water aquifers and their escape to the surface compromises human health and safety and create unthinkable environmental hazards. Cement exposed to these acid gases degrade, thereby promoting their release through the wellbore to overlying fresh water formations and/or the environment. This study investigates how these contaminants aid the corrosion of well cement in high pressure-high temperature (HPHT) environment.

Experiments were conducted under two broad test conditions. In the first case, cement cores were aged at 100°F in CO2-H2S brine solution. The total test pressure was varied from 3000 psi to 9000 psi. In the second case, cement cores were exposed to brine saturated with gas mixture comprising H2S, CO2, and CH4 at total test pressure of 6000 psi. Temperature was varied from 100°F to 350°F. The compressive strength, shear bond strength, porosity, and permeability of the aged and unaged specimens were measured to quantify the alteration in these critical cement properties. Observations are supported with FTIR, SEM and EDS analyses.

As temperature increases, the presence of H2S shows more impact on the loss of mechanical strengths and increase in transport properties of Class G cement than Class H cement. Variation of H2S concentration also shows significant impact on cement integrity.

Compared to previous study involving the exposure of cement to pure CO2, the presence of H2S improves the relative strength of cement. However, transport properties are compromised. FTIR mineralogy confirms that the extent to which cement is carbonated by CO2 is limited by the presence of H2S. In addition, SEM and EDX indicate that ettringite was formed at low temperature (100°F). However, it dissolves at high temperature (350°F) without significantly compromising the structural integrity of cement.

The most significant new finding in this study is that the presence of H2S and its coexistence with CO2 under HPHT conditions minimizes the loss of the structural integrity of well cement by pure CO2. This is important because it narrows down the most significant factor to consider when designing acidresistant cements for HPHT wells.
The influence of indirect monetary tools on price and output: the case of Jordan (1993-2013)
Authors: R. Alqalawi Usama , A. Jemel Hail , A. Alwaked Ahmad , M.S. Istaiteyeh Rasha
Published: March 2017

This research aims to identify the main monetary policy tools in Jordan, then, to estimate their effect on price and output level. A time series data covering the period between 1993 and 2013 were utilized to estimate the targeted models using two-step regression. Firstly, the authors measured the impact of indirect policy tools on money supply and, secondly, they determined the impact of money supply on price and output levels. Results show that open market operations of the Central Bank of Jordan through issuance of certificates of deposit, especially at the beginning of 1993 and the repurchase agreements have been effective in influencing the money supply in Jordan. Unfortunately, this policy was not able to control the real or nominal output level even though it has an effect on the price level.
Keywords: monetary policy, open market operations, required reserve ratio, discount rate, price and output. JEL Classification: E31, E42, E52, E58
Corporate governance practices in the banking sector of Bangladesh: do they really matter?
Authors: Parvez Ahmed Samiul , Zannat Rahatul , Uddin Ahmed Sarwar
Published: March 2017

A well governed institution is expected to use its resources optimally and, thus, perform more efficiently and contribute positively to economic development of a nation. However, often, it can be seen that poor management of the stakeholders leads to less than optimal strategic directions for an institution. Due to recent global financial crisis and rising issues of the Bangladeshi banking sector, corporate governance is one of the factors that have gained considerable attention. Recent drive of the governance issues of the banking sector of Bangladesh is expected to bring positive change in the financial sector and, hence, it is crucial to assess whether complying with governance codes leads to desired outcome or not. Specifically, the main purpose of this study is to examine the relationship between performances of commercial banks with corporate governance factor along with some internal and macroeconomic variables. Thus, the listed commercial banks in the Dhaka Stock Exchange (DSE) of Bangladesh were considered for the study. Subsequently, considering data availability of the time period (2011-2014), 29 listed commercial banks in the DSE have been considered and, hence, Ordinary Least Squared (OLS) regression models were used through Eviews 8.0 for analyzing the data. Though the study shows a positive relation between corporate governance and performances of banks, the statistical insignificance of the relation raises concern regarding various issues of corporate governance in the financial sector of Bangladesh. Keywords: corporate governance, financial institutions, performances of commercial banks. JEL Classification: G21, G30, G38, G39, O16
A migráns házi idősgondozás gyakorlata - Ausztria mint befogadó ország példáján keresztül
Authors: Gábriel Dóra
Published: March 2017

A társadalmi öregedés Európa és a világ számos országát érinti, mely új kihívásokat von magával az egyes társadalmakban. Ezen kihívások egyike az idősek gondozása, melynek egyik formája az érintettek által preferált otthoni környezetben biztosított gondozás. A gondozott hozzátartozói gyakran olcsó, külföldi munkaerőt bérelnek fel erre a munkára, hogy biztosítsák a beteg kényelmét, magukat pedig mentesítsék számos feladat alól. A tanulmány azon témaköröket tárgyalja, amelyek a házi idősgondozás szakirodalmában hangsúlyos kérdések. A gondozói munkát végző vándormunkásokhoz kapcsolódó nemzetközi kutatások elsősorban kvalitatív módszertanra épülő munkák, mely annak is betudható, hogy igen nehéz megbecsülni a sokszor illegális munkát végző migráns gondozók számát. A tanulmány Ausztria mint befogadó ország példáján keresztül mutatja be a házi gondozás intézményét, ahol ez a korábban szabályozatlan tevékenység rövid idő alatt legálissá vált. A gondozói munka intézményrendszerén belül, a befogadó országtól sokszor független ügynökségek, toborzóirodák és hálózatok szerepe szintén bemutatásra kerül. A tanulmány részletezi a migrációs helyzet miatt bekövetkezett változásokat a családi szerepekben és a családi munkamegosztásban, valamint kitér a globális egyenlőtlenségi viszonyokat fenntartó migráció gender-aspektusára is.
Molding the asset management system to PAS 55-1/ISO 55001 in one Scandinavian water and wastewater works
Authors: Milina J. , Kristiansen P. , Jacobsen A. S. , Sundve A. I.
Published: March 2017

Good practice and standards set strict requirements for optimization and continuous improvement of physical asset management. The new international standard for asset management provides a framework for asset intensive industries to develop and implement sound asset management systems. Unlike the largest and most global industries, there are very few, if any, providers of services in the water sector that have developed and implemented a full set of best practices, in compliance with specifications created by the standard. Oslo Water and Sewerage Works (Oslo VAV) has worked systematically to evolve its asset management system by standardizing work processes and operating procedures in its Business Process Management System, implementing good practice in infrastructure asset management, and by improved management and control of the private contractor that operates the wastewater treatment plant's processes and activities. This paper provides insight into Oslo VAV's asset management system, assessment of current practice vs. best practice for complying with the standard and high priority areas for improvement.
Improving asset utilization with an Asset Investment Planning and Management methodology
Authors: Neijens B.
Published: March 2017

In a world of aging assets and limited financial and human resources, companies often struggle to decide which asset-related projects should get attention first. Managers are required to compare highly divergent project justifications, and must somehow decide which projects bring most value to the company. Even within one project, it might be difficult to select the right option: is it better to change an asset's maintenance regime, plan a major refurbishment, or replace it altogether? The PAS-55 specification and the new ISO 55000 standard clarify the principles, but do not help with selecting or applying a methodology. This paper explores how combining asset failure risk evaluations with a well-defined corporate value function can lead to optimal decision making, and how the resulting decisions should be tracked and adjusted over the lifetime of the underlying projects or programs to maximize the execution rate.
Design optimization of a simple, single family, anaerobic sewage treatment system
Authors: dos Santos Silvânia Lucas , de Oliveira Simões João Paulo , Paiva Francisco Vieira , van Haandel Adrianus
Published: March 2017

Anaerobic sewage treatment systems, notably the upflow anaerobic sludge blanket reactor, have been applied successfully in Brazil in dozens of large scale units. In this paper a small reactor is proposed for use in single family houses, without a connection to a sewerage network. The proposed reactor is much smaller than the traditional septic tank and yet the treatment efficiency is much higher. It comprises a lower cylindrical digestion zone and an upper settling zone, connected by a transition zone. Several configurations with different digestion and settling zone diameters were tested to establish their influence on reactor performance. A high degree of organic matter removal was obtained with 250 L reactors with retention times of 6 to 12 hours. A large sludge mass was retained in the digestion zone and high treatment capacity was maintained throughout the study. Tests showed that sludge settled better in the reactor than it did after discharge with the effluent. In contrast the, methanogenic activity of the sludge in the reactor was the same as that of the sludge expelled.
A study on prediction method for ozone dosage and residual ozone concentration in advanced ozone water treatment
Authors: Hyung J. S. , Kim K. B. , Kim M. C. , Lee I. S. , Koo J. Y.
Published: March 2017

Ozone dosage in most water treatment plants is operated by determining the ozone concentration with the experience of the operation. In this case, it is not economical. This study selected the factors affecting residual ozone concentration and attempted to estimate the optimum amount of hydrogen peroxide dosage for the control of the residual ozone concentration by developing a model for the prediction of the residual ozone concentration. The prediction formulas developed in this study can quickly respond to the environment of water quality and surrounding environmental factors, which change in real time, so it is judged that they could be used for the operation of the optimum ozone process, and the control of ozone dosage could be used as a new method in controlling the concentration of ozone dosage and the concentration of residual ozone.
Avaliação de produtividade e sustentabilidade de sistemas agroecológicos de duas propriedades do interior do estado de São Paulo
Authors: Almeida Thaís Helena Mandello Pimenta , Marchiori Nidia Mara , Carneiro Magda Silva
Published: March 2017

A transição da agricultura convencional para a agroecologia - um novo conceito de desenvolvimento rural - demanda mudanças progressivas. Esta prioriza as esferas: sociais, econômicas, ambientais e científicas. Assim, o objetivo deste trabalho foi comparar dois agroecossistemas por meio de indicadores agroecológicos de sustentabilidade. As áreas de estudo se localizavam na zona rural da região de Campinas e Jaguariúna, estado de São Paulo. As propriedades foram avaliadas com base em 63 indicadores e comparadas mediante gráficos de radar e teste Kruskal-Wallis. Os resultados mostram que a avaliação de aspectos em diversas áreas permite categorizar de forma mais precisa o estágio e a qualidade da produção no sistema. As propriedades estão em evolução na transição agroecológica, sendo que a Vila Yamaguishi possuiu um sistema mais estruturado.
Desenvolvimento territorial sustentável: uma nova experiência na Mata Atlântica
Authors: Tiepolo Liliani Marilia , Denardin Valdir Frigo
Published: March 2017

Apresentamos as origens e os primeiros resultados de uma experiência de pós-graduação stricto sensu da expansão da Universidade Federal do Paraná (UFPR), localizada no litoral do estado. A partir de um projeto político pedagógico diferenciado e após oito anos de consolidação, foi criado o Mestrado Acadêmico em Desenvolvimento Territorial Sustentável.  Seu desafio é realizar pesquisas científicas inter e multidisciplinares que contribuam para o desenvolvimento regional e para o entendimento das constantes tensões envoltas na conservação e degradação da natureza da região, um notável remanescente da Mata Atlântica brasileira. Questões paradoxais permeiam todo o território, pois além de rica biodiversidade, conserva traços culturais singulares, ao mesmo tempo em que se destaca como polo industrial de exportação de commodities do agronegócio e de prestação de serviços para a exploração do petróleo do pré-sal.
Formação docente na pós-graduação stricto sensu: experiências na Universidade Federal do Rio Grande do Norte
Authors: Magalhães Rita de Cássia Barbosa Paiva , Raffin Fernanda Nervo , Gutierre Liliane Dos Santos , De Azevedo Alcio Farias
Published: March 2017

Este trabalho aborda a adesão ao Programa de Apoio a Planos de Reestruturação e Expansão das Universidades Federais (Reuni) no contexto da Universidade Federal do Rio Grande do Norte (UFRN) e tem por objetivo caracterizar ações voltadas à formação docente circunscritas à pós-graduação stricto sensu desta universidade.  Discute experiências do Curso de Iniciação à Docência e dos Estágios em Docência, constituintes do Programa de Assistência à Docência na Graduação (PADG), como política institucionalizada para cumprimento do objetivo de capacitar docentes para o ensino de graduação e de pós-graduação, além de se reportar às experiências de articulação entre Graduação e Pós-Graduação nesta instituição de ensino. Por fim, acena para os desafios no tocante à dimensão de formação para a docência universitária na pós-graduação.
Desafios da Capes na condução da Política Nacional de Formação de Professores da Educação Básica
Authors: Souza Valdinei Costa
Published: March 2017

O objetivo deste ensaio é instigar o debate sobre o papel da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Capes) na condução da Política Nacional de Formação de Professores da Educação Básica. Para tanto, analisa as atas do Conselho Técnico Científico da Educação Básica (CTC-EB), por meio da hermenêutica, destacando as decisões estratégicas da Capes na condução dessa política. Como resultado, apresenta os desafios que a Capes precisará enfrentar para simultaneamente: a) cumprir a nova missão que lhe foi imputada no contexto da formação de professores da educação básica; e b) manter a identidade institucional, por ela construída, no âmbito dos seus programas tradicionais de formação de pessoal.
El cuerpo como medida de todas las cosas, entre otras cosas
Authors: Saldarriaga Roa Alberto
Published: March 2017

Los humanos poseemos una corporeidad particular: nuestra estructura corporal es simétrica; tenemos cabeza, tronco y extremidades -manos y pies- que sirven para muchas cosas. y el cuerpo es, en más de un sentido, la medida con la cual se ha construido a lo largo del tiempo el hábitat, el mundo habitable. a eso se le ha llamado “escala humana”: el cuerpo como medida de todas las cosas.
Orientación gravitacional del cuerpo y percepción visual: de la integración multimodal sensorial a la configuración perceptual de estímulos biestables
Authors: Rodríguez Martínez Guillermo Andrés
Published: March 2017

Algunos estudios han demostrado que la posición del cuerpo humano influye en la percepción visual. De alguna manera, desde que por procesos evolutivos la percepción involucró aspectos propios de la gravedad, el ser humano pudo desarrollar un modelo interno multimodal sensorial y cognitivo referido a esta fuerza física. Dicho modelo está muy estrechamente ligado a la percepción visual, de modo que la percepción de las imágenes que aceptan dos posibles configuraciones perceptuales (llamadas imágenes biestables) se puede ver influenciada por la información que provee el sistema vestibular. En ese sentido, la orientación gravitacional del cuerpo humano debe ser estimada cuando un observador se enfrenta al proceso de decodificación de un estímulo visual. La percepción biestable está relacionada con habilidades cognitivas, en razón a que este tipo de percepción requiere de un procesamiento central que normalmente involucra las áreas prefrontal y parietal del cerebro humano. Este hecho puede ejercer una influencia en los saltos o cambios de configuración perceptual que se pueden manifestar, entendiendo que el estímulo biestable involucra dos posibles interpretaciones. El concepto de reversibilidad perceptual se hace presente cuando el observador experimenta un cambio entre una configuración perceptual y otra. Así, el número de cambios entre un percepto y otro es el número de reversibilidades perceptuales. Estas alteraciones perceptuales, que normalmente ocurren cuando se observaeuna imagen biestable, pueden depender tanto de la intención del observador por hacer dichas alternancias como del tipo de imagen biestable o ambigua que está siendo observada.
Identidades
Authors: Daza Jessica , Alza Jorge , Bonilla Lolly , Porras Valentina
Published: March 2017

Muchos artistas han usado el cuerpo humano por siglos para explotar, excavar, escudriñar y desafiar conceptos como identidad, belleza, raza, género, sexualidad o etnia. Esa exploración viene a través de representaciones del cuerpo o del uso de sus propios cuerpos en sus procesos creativos.
Perelman, Informal Logic and the Historicity of Reason
Authors: Tindale Christopher W.
Published: March 2017

In a posthumous paper, Perelman discusses his decision to bring his theory of argumentation together with rhetoric rather than calling it an informal logic. This is due in part because of the centrality he gives to audience, and in part because of the negative attitude that informal logicians have to rhetoric. In this paper, I explore both of these concerns by way of considering what benefits Perelman’s work can have for informal logic, and what insights the work of informal logicians might bring to the project of Perelman and Olbrechts-Tyteca.
Is Practical Reasoning Presumptive?
Authors: Kock Christian
Published: March 2017

Douglas Walton has done extensive and valuable work on the concepts of presumption and practical reasoning. However, Walton’s attempt to model practical reasoning as presumptive is misguided. The notions of “inference” and of the burden of proof shifting back and forth between proponent and respondent are misleading and lead to counterintuitive consequences. Because the issue in practical reasoning is a proposal, not a proposition, there are, in the standard case, several perfectly good reasons on both sides simultaneously, which implies that argument appraisal necessarily contains a subjective element—a fact argumentation theory needs to conceptualize.
The intersubjectivist conception of autonomy: Axel Honneth’s Neo-Hegelian critique of liberalism
Authors: Ivkovic Marjan
Published: March 2017

The paper reconstructs Axel Honneth?s Neo-Hegelian critique of the
classical-liberal conception of autonomy and his articulation of an
alternative view of personal autonomy as the property of certain types of
intersubjective relations of recognition in modernity, developed most
systematically in Honneth?s recent work Freedom?s Right (Das Recht der
Freiheit). The analysis of Freedom?s Right focuses on reconstructing
Honneth?s critique of the ?negative? and ?reflexive? types of freedom
(autonomy) articulated within the liberal tradition, and contrasting the
former two with the conception of ?social freedom? (the inter?subjectivist
conception of autonomy) that Honneth formulates through a detailed ?normative
reconstruction of modernity?. Finally, the paper considers the proximity of
Honneth?s ?Hegelian liberalism? to communitarianism.
Spontaneous closure of muscular ventricular septal defects
Authors: Pejcic Ljiljana , Mileusnic-Milenovic Radmila , Ratkovic-Jankovic Marija , Nikolic Ivana
Published: March 2017

Introduction/Objective. Ventricular septal defect (VSD) is the most frequently diagnosed congenital heart anomaly. The prognosis is usually good as it has spontaneous closure evolution, especially small muscular VSDs. The aim of this study was to determine the natural history of isolated muscular VSDs including the frequency of spontaneous closure in relation to location in the muscular septum and the age at the time of closure. Methods. The study included 96 children (52 girls and 44 boys) with isolated muscular VSD diagnosed during the first month of life. We analyzed the tendency of spontaneous closure of these defects for the duration of childhood during a follow-up period of 16 years. Two-dimensional color Doppler echocardiography was performed to detect muscular VSD as a primary cardiac lesion. There was significant prevalence of small apical versus trabecular defects and their outcomes were evaluated. Results. Our study evaluated 91 children, 49 (53.8%) girls and 42 (46.2%) boys who did not undergo surgery. Apically located VSD was diagnosed in 68 (74.7%), while trabecular defects were found in 23 (25.3%) children. Spontaneous closure occurred in 56 out of 91 cases (61.5%). The time of spontaneous closure was most commonly recorded during the first six months after birth (46.4%). The overall rate of spontaneous closure was 81.3% by the end of the first year. Apically located ventricular defects underwent spontaneous closure in the majority of patients, in comparison to trabecular ventricular defects (?2 = 12.581; p < 0.001). Kaplan?Meier analysis demonstrated a significant difference in the average time required for spontaneous closure between the analyzed patient groups (log-rank = 9.64, p = 0.002). Conclusion. The frequency of spontaneous closure of muscular VSDs, especially apically located, is very high in the first six months, especially within the first year of life. It is advisable to detect them early on using color flow imaging and to follow up patients up to spontaneous closure.
Microstructure and thermal properties of Cu-SiC composite materials depending on the sintering technique
Authors: Chmielewski Marcin , Pietrzak Katarzyna , Strojny-Nędza Agata , Kaszyca Kamil , Zybała Rafal , Bazarnik Piotr , Lewandowska Malgorzata , Nosewicz Szymon
Published: March 2017

The presented paper investigates the relationship between the microstructure
and thermal properties of copper-silicon carbide composites obtained through
hot pressing (HP) and spark plasma sintering (SPS) techniques. The
microstructural analysis showed a better densification in the case of
composites sintered in the SPS process. TEM investigations revealed the
presence of silicon in the area of metallic matrix in the region close to
metal-ceramic boundary. It is the product of silicon dissolving process in
copper occurring at an elevated temperature. The Cu-SiC interface is
significantly defected in composites obtained through the hot pressing
method, which has a major influence on the thermal conductivity of
materials.
On the conception of Homeric allegories in the twelfth century
Authors: Sijakovic Jovana
Published: March 2017

John Tzezes and St. Eustathius of Thessalonica, the two great Byzantine
commentators of Homer and contemporaries, gave considerable attention to the
tradition of allegorical interpretation of the Iliad and the Odyssey. The
paper points to key differences in their understanding of the Homeric
allegories. Although familiar with the same body of older interpretations,
they tended to use it in a different way and show a rather personal view of
the Poet and his work.
PERANCANGAN KENDALI WIRELESS ROBOT BERODA DENGAN REMOTE CONTROL MP3 PLAYER BERBASIS MIKROKONTROLER AT89S52
Authors: Nurhayata I Gede
Published: March 2017

Kendali wireless dengan remote kontrol infra merah umumnya diterapkan dalam pengendalian peralatan listrik seperti televisi dan music MP3 player.  Tujuan dari penelitian ini adalah memanfaatkan fungsi remote kontrol infra merah pada MP3 player dalam aplikasi lain pada sistem kendali robot beroda. Untuk mencapai tujuan penelitian tersebut dilakukan tahapan yaitu perancangan  hardware dan software pada mikrokontroller AT89S52 berdasarkan NEC Protocol Infra Red sehingga dapat diketahui kode dari setiap tombol pada remote kontrol MP3 Player. Kemudian kode tersebut digunakan sebagai kendali pada perilaku robot beroda. Hasil penelitian menunjukkan  bahwa kode remote kontrol MP3 player khususnya pada tombol (2),(4),(6) dan (8) telah berhasil dideteksi dan mampu mengendalikan perilaku robot beroda antara lain : maju, mundur, belok kiri dan belok kanan.   Kata-kata Kunci :         robot beroda, remote kontrol, mp3 player, mikrokontroller AT89S52
PELATIHAN PEMANFAATAN LIMBAH KEMASAN PLASTIK MENJADI PRODUK SENI KERAJINAN DI KELURAHAN KAMPUNG KAJANAN KECAMATAN BULELENG KABUPATEN BULELENG
Authors: - Damiati
Published: March 2017

Pengabdian Pada Masyarakat ini bertujuan untuk memberikan pengetahuan dan pelatihan kepada ibu-ibu dan remaja putus sekolah dalam bentuk ceramah dan pemberian keterampilan tentang pemanfaatan limbah kemasan plastik menjadi produk seni kerajinan yang memiliki nilai ekonomis yang nantinya dapat meningkatkan pengasilan keluarga. Kegiatan pelatihan ini menggunakan metode ceramah, demonstrasi, tanya jawab dan praktek langsung tentang pemanfaatan limbah kemasan plastik menjadi produk seni kerajinan seperti tas, table mats, tudung saji, dan lain-lain. Untuk mengetahui tingkat keberhasilan pelaksanaan pelatihan dilakukan evaluasi tingkat penguasaan keterampilan mulai dari tahap persiapan, pemilihan bahan, mendisain dan pelaksanaan keterampilan membuat prosuk seni kerajinan dari bahan limbah kemasan plastik. Hasil pelatihan menunjukkan tingkat keberhasilan yang dicapai tergolong baik, yaitu peserta mampu membuat keterampilan produk seni kerajinan dari bahan limbah kemasan plastik berupa tas, table mats, tudung saji, dan lain-lain, dengan baik dan benar.   Kata-kata kunci : limbah kemasan plastik, produk seni kerajinan
OPTIMALISASI PEMECAHAN MASALAH TRANSPORTASI MENGGUNAKAN METODE NWC, INPEKSI, DAN VAM
Authors: Kertiasih Ni Ketut
Published: March 2017

Sistem optimalisasi dalam pemecahan masalah transportasi menggunakan metode NWC (north west corner), INPEKSI (matrik minimum), dan VAM (Vogel Approximation Method) adalah sebuah sistem yang dibangun dan difungsikan sebagai sistem yang diharapkan mampu mengetahui biaya paling minimum dalam pengalokasian barang dengan membandingkan tiga metode tersebut. Sistem ini memiliki kelebihan dalam proses input, keakuratan proses perhitungan dan proses pengerjaan lebih cepat dari proses perhitungan secara manual. Sistem ini digunakan untuk melakukan proses input jumlah gudang, input jumlah pabrik, biaya satuan dari tiap-tiap pabrik menuju tiap-tiap gudang, hasil produksi tiap pabrik, dan kapasitas gudang, selanjutnya dilakukan proses perhitungan dengan menggunakan ketiga metode tersebut. Sistem ini dibangun dengan menggunakan visual basic 6.0 dan microsoft office accsess 2007 sebagai basis datanya. Sistem ini diharapkan dapat mempermudah pengguna dalam penyelesaian masalah pendistribusian barang dari pabrik ke masing-masing gudang.   Kata-kata  kunci :  Optimalisasi, NWC, INPEKSI dan VAM