bluuebunny/crossref_metadata_2025 huggingface dataset:
Concluding thoughts on the REACT Programme
Authors: Dunne Elisabeth
Published: September 2017

REACT, in many ways, has been about diversity: of type of institution; of students’ setting and intake; of current level of activity in relation to student engagement; of approaches to change, of roles and expertise of partner staff; of the particular purpose and activity of the ‘hard to reach’ engagement project undertaken and the stakeholders involved. As a consequence, and because the authors for this issue were encouraged to write in ways they considered appropriate rather than being given a standard template, the content and style of every paper are very different and each needs to be read for its own individual story. There are three agendas, however, which are fundamental to the REACT programme and outcomes. Each of these is discussed in turn: building evidence through a culture of evaluation and research; ‘hard to reach’ students and the notion of ‘reaching out’; the management of change in the context of REACT. The discussion reflects the learning of the REACT team, gained from working alongside the collaborative partner institutions, and includes comments from the independent evaluation undertaken by GuildHE to support points made.
The Application of Aluminum Toe Casing for Landing Production Strings in Extended Lateral Wells
Authors: Brown Christian F. , Dziekonski Mitchell
Published: September 2017

With the increase in average lateral length for horizontal wells comes increased challenges for reaching total depth (TD) with the production casing. Any production interval left un-cased will not contribute to initial or ultimate production or be booked as reserves, which can have a major detrimental impact on the financials of these wells.

ALTISS Technologies has designed a patent pending aluminum casing concept to facilitate the installation of long cased laterals, and assist with landing casing at the total depth. Due to its low density and low modulus of elasticity, the aluminum casing is about half the buoyed weight and twice as flexible as comparable steel casing. These physical properties help the aluminum casing lighten the toe of the casing string and navigate through micro doglegs and tortuous wellbores.

The aluminum casing was designed with a focus on torque and drag reduction, to be used in limited quantities to maximize the benefits and ensure that casing reaches total depth. Analysis showed that 4,000 pounds of hook load could be added, without casing rotation, with as little as 160 feet of aluminum casing installed, in some cases. To ensure proper threaded connections with the low modulus aluminum, ALTISS designed its own 5 ½" premium threaded connection, which exceeded 56,000 ft.-lbs. yield torque in testing. Multiple aluminum tubular specimens were collapsed in a laboratory setting to validate equations which are not covered by API calculations, nor conventional closed form solutions (e.g. Timoshenko, Tamano). An experimental nano-coating is currently being evaluated that will protect the aluminum from potential forms of corrosion, including galvanic reactions and acid programs.

The advantages of installing aluminum casing may allow for eliminating expensive premium threaded connections needed for rotating casing, or alternatives such as floating casing. Ensuring the lateral is 100% cased improves initial production, allowable booked reserves, and ultimate hydrocarbon recovery of the well.
Machine Learning–Based Trigger Detection of Drilling Events Based on Drilling Data
Authors: Zhao Jie , Shen Yuelin , Chen Wei , Zhang Zhengxin , Johnston Sonny
Published: September 2017

A method is developed to detect the precursors of drilling events based on drilling data such as surface data, wellbore geometry data, lithology (formation characteristics), and downhole measurements from various downhole tools. The drilling events refer to interesting behavior of the drilling system detected or recorded, such as severe vibration, stuck pipe, fluid loss, sudden equivalent circulating density (ECD) changes, etc.

The method is based on various machine learning techniques to learn the changing trend of drilling parameters when the drilling events happen. Specifically, the drilling events are first extracted from massive drilling data using defined thresholds and/or criteria. Then, the time series of drilling parameters are represented by symbolic aggregate approximation (SAX). The patterns of these SAX strings are clustered by unsupervised learning and then used for pattern recognition with dynamic time warping (DTW). Finally, the searching pattern recognition is proposed to classify the changing trend of drilling parameters.

The traditional SAX method is not suitable for drilling data processing because it assumes that the data should be Gaussian distributed. With the modified SAX, two sets of SAX parameters are used to cluster the time series by unsupervised learning with dynamic time warping distance as measure. It is found that one set of SAX parameters (alphabet size of 5 and 15-data-point window) could yield more reasonable patterns, including flat, ramp up, ramp down, step up, step down, pulse up, and pulse down. The changing trends of drilling parameters are classified to the predefined patterns with shortest DTW distance by using searching pattern recognition method. Finally, several experiments are conducted to demonstrate the effectiveness of proposed method.

This is an innovative work to apply the data mining and machine learning techniques to drilling interpretation. It provides a useful way for the remote center to monitor the onset of abnormal drilling events and inform the drillers taking actions to optimize the drilling operation. In addition, it helps the drilling community to understand the triggers of challenging drilling events such as stick/slip, whirling, etc.
Observation of Fracture Growth in Laminated Sandstone and Carbonate Rock Samples under Brazilian Testing Conditions Using Digital Image Correlation Technique
Authors: Nath Fatick , Salvati Peter E , Mokhtari Mehdi , Seibi Abdennour , Hayatdavoudi Asadollah
Published: September 2017

Strain is a critical parameter in the calculation of elastic rock properties, yet its conventional methods for strain measurement has several deficinies. In this paper, we analyze the application of optical methods with Digital Image Correlation (DIC) technique to provide detailed information regarding fracture patterns and strain development with time under Brazilian testing condition. The effect of porosity, rock types, lamination, and saturation on tensile strength will be also discussed.

To examine the effect of rock type, 60 samples of sandstone (Parker, Nugget and Berea) and carbonate formations (Winterset limestone, Silurian dolomite, Edward Brown and Austin Chalk) were testedunder dry and saturated conditions and with regard to lamination angle in laminated samples. A Vic-snap photogrammetry system was employed to monitor the samples in non-contact manner while conducting indirect tensile experiment. DIC is based on the photogrammetry system, which helps to visualize and examine rock fracture pattern from the recorded images of the rock before and after deformation by assessing the strain development in samples.

The experimental results show that - (1) average tensile strength declines while increasing porosity for homogeneous, laminated, and heterogeneous rock specimens. (2) lower tensile strengths are observed in carbonate rock samples compared to the sandstones except Silurian dolomite; (3) saturation reduces the rock strengths, for isotropic samples, highest 28% decline in strength (Berea sandstone) observed; whereas, a larger decrease (65%) was observed in fully heterogeneous Edwards Brown carbonate samples; (4) increase of lamination angle (from 0° to 90°) impacts the tensile strength, average tensile strength was observed for Parker and Nugget sandstone greater in perpendicular to the lamination (9 = 90°) direction compare to that of parallel (9 = 0°); (5) fracture patterns examined for homogeneous rocks are almost centrally propagated and relatively linear; whereas, three different fracture patterns (central fracture, layer activation and non-central or mixed mode) investigated for laminated and heterogeneous samples; (6) Finally, DIC results illustrated the fracture initiation and propagation with consistent strain mapping. The homogeneous samples produced a uniform fracture strain until the diametrical split where for the laminated samples were influenced by planes of weakness, and fully heterogeneous anisotropic rocks produced winding and erratic fractures.
Marcellus Shale Toe-up Laterals: Hydraulics and Well Control Implications
Authors: Elshehabi Tawfik , Bilgesu Ilkin
Published: September 2017

Unconventional shale resources are drilled horizontally following the geologic bed dip upward or downward and completed with multi-stage fracturing to maximize reservoir contact. A recent study in Oklahoma claimed that toe-up (inclined upward) laterals yield the highest production rate and estimated ultimate recovery. The objective of this study is to investigate drilling fluid hydraulics and well control operations in toe-up laterals and compare the results to toe-down laterals.

This study uses a multiphase steady-state hydraulics and a dynamic well control simulator. A hydraulics model was developed and verified with a data from a recently drilled Marcellus shale lateral in Monongalia County, WV in 2015. Static and dynamic pressure profiles were examined at drilling flow rate and at slow pump rate. Further, this research studies gas kick behavior and well control practices for kicks experienced at shallow, middle, and deep zones in the lateral section. Additionally, it considers the impact of operational parameters and influx characteristics on wellbore integrity.

The results of this study showed that the developed hydraulics model successfully predicted the pump pressure with an accuracy of 0.97. Larger kick sizes result in higher pit gain, gas flow rate, choke, and casing shoe pressures in toe-down laterals. In contrast, in toe-up laterals, the higher the kick size, the longer the circulation times with an insignificant impact on the choke and shoe pressures. In toe-up laterals, gas bubbles migrated towards the toe and accumulated in high side pockets. Likewise, choke experienced less pressure, volume, and gas discharge rate for extended periods of time in toe-up laterals. Therefore, higher circulation rates and longer circulation times were essential to flush out the dispersed and trapped gas bubbles. The closer the kick location to the vertical section of the well, the shorter the circulation time needed. However, kicks experienced at the heel resulted in higher pit gain, gas discharge rate, choke pressure, and consequently high casing shoe pressure.

Identifying the consequences of drilling toe-up laterals on hydraulics and well control is crucial for drilling operations. This improves rig and personnel safety and reduces the blowout associated risks. Accordingly, it is critical to verify the well integrity by monitoring surface choke, casing shoe, and constant bottomhole pressures throughout the entire well control operations.
Analysis of Compositions of Flowback Water from Marcellus Shale Wells by Utilizing Data Mining Techniques
Authors: Pan Yuewei , Yilin Wang John
Published: September 2017

Volume and salt concentrations in Marcellus flowback water depend on geology, drilling and completions, stimulation and flowback operations. Recent studies include evaluations of geochemical origins based on the compostition concentrations, flowback sampling analysis and numerical studies. However, an in-depth understanding of chemical compositions as well as the changes of compositions is still needed.

In this paper, we will first review the literature related to flowback water in Marcellus shale gas wells to fully understand the chemistry, geochemistry, and physics governing a fracture treatment, shut-in, and flowback. We will then gather all public and in-house flowback data, named as 3-week or 3-month flowback in this work, to build a data set of flowback water compositions. After data screening, we will then analyze this composition database using four different methods: geographical, changes over time, linear regression, clustering and multi-variable analysis. New understandings such as the magnitude and prevailing trends of concentrations for target constituents as well as the correlations among flowback compositions, the differentiation between early and late time flowback water were obtained and explained on the basis of geochemistry and physics. Guidelines for a comprehensive sampling protocol will be provided based on our analysis.
A Quantitative and Visual Experimental Study: Effect of Fracture Roughness on Proppant Transport in a Vertical Fracture
Authors: Huang Hai , Babadagli Tayfun , Li Huazhou Andy
Published: September 2017

The roughness of fractures may play an important role in affecting the migration and placement of proppants during hydraulic fracturing operations. Previous studies focused on investigating the proppant transport in smooth vertical fractures, which did not consider the effect of the fracture-surface roughness. We examine the migration of proppants in rough and vertical fractures and then quantitatively reveal the effect of roughness on the instantaneous proppant transport and final proppant placement. Two types of rock samples (marble and granite) are fractured with the Brazilian test and molded to manufacture 20 × 20 × 5 cm transparent replicas. The surface roughness of these rock samples was first characterized by fractal dimensions. Then, the dyed fracturing fluid with a given proppant loading was injected into the rough vertical fracture. In each test, the inlet pressures were continuously monitored in order to obtain the differential pressure across the fracture model while the proppants were being transported in the fracture. The process was videotaped to real-time track the proppant distribution in the rough fracture.

The proppant-transport behavior in the rough and vertical fracture was observed to be totally different from that in the smooth fracture. The major experimental findings include the following: 1) The proppant in a rough vertical fracture does not progress as a regular sand bank that commonly occurs in the smooth fracture, but rather an irregular-shape sand clusters with fractal characteristics; 2) In the rough and vertical fracture, the phenomenon of proppant bridging is visually observed, and such phenomenon is more likely to occur in the location with a larger roughness height. This implies rough fracture could promote a wider spreading of the proppant in the fracture compared to smooth fractures, and; 3) The existence of roughness enhances the vertical displacement of fluid containing proppants. These effects are also favorable for obtaining a better filling of the proppants in the fracture. Our experimental study reveals the mechanisms of proppant transport and distribution in real vertical fractures under the influence of roughness effect.
US Class II Underground Injection Wells: Injection and Seismicity Operational Risk Factors
Authors: Capper L. H. , Lee M. C.
Published: September 2017

Management of produced water from conventional plays and shale and tight oil and gas plays is driving subtle yet potentially consequential changes in certain regions and Underground Injection Control (UIC) formations.

UIC operation topics of interest include induced seismicity (from UIC injection, extraction, or unknown/anomolous activity), formation pressurization from years of UIC injection, and reallocation of produced water from originating "tight" producing formations to more receptive conventional, depleted, or waterflooded formations, resulting in formation pressure changes. Early signs of diminished formation health or threats to operations continuity can include: Barely felt (low magnitude) induced and anomolous earthsquakes - which nonetheless are a cause of significant concern to the public – and by extension, landowners, stakeholders, and regulators.Reduced formation injectivity – suggesting that injection rates should be "dialed back", or that injection pump pressures be increased, or that water be transported further to more receptive injection formations.

If encountered, stresses can contribute to cost overruns, impairment to operations schedules, additional oversite to assure regulatory compliance, reduced public goodwill, and potentially, impairment of industry’s social license to operate.

Through analysis of publicly available UIC operations data and well completion data, we evaluate methods which might help to qualitatively assess UIC issues with macro, regional, local and subsurface formation perspectives. The methods discussed may provide operators with a consistent simple methodology to qualitatively identify those assets and UIC formations with higher potential relative risk which may warrant more detailed exploration and possible risk mitigation.
Analysis and Design Method for Particulate Diversion in Carbonate Acidizing
Authors: Safari Reza , Shahri Mojtaba P. , Smith Clayton , Fragachan Francisco
Published: September 2017

In this paper, an integrated analysis and design method is presented to understand and quantify the effect of particle jamming near the entrance of perforation/wormhole tunnel. An advanced wellbore-scale three dimensional numerical studies with a coupled computational fluid dynamics (CFD) and discrete element model (DEM) were performed to simulate different mechanisms involved in particulate diversion. The results of wellbore-scale simulation were translated into an engineering particulate diversion model, based on the proven diversion mechanisms from laboratory and simulation. The model is incorporated into an integrated carbonate acidizing simulator.

Generally particulate diversion is not used in carbonate acidizing because of the formation of the wormholes and potential difficulty in removing particles from the induced wormholes or perforation tunnel. The new degradable particulate system addresses the issue and presents an efficient approach to divert acid in carbonate stimulation. Detailed physics based simulation demonstrate that the induced wormholes or perforation would plug thru two distinct mechanisms: (1) temporarily seal the entrance of small scale wormholes or perforation with a combination of small and large particles, and/or (2) large particles bridge along tapered path of wormhole/perforation and forms a temporary filter cake on the mouth of opening. Either of these diversion mechanisms will decrease the injectivity locally and promote fluid diversion from inside of well into other normally under-stimulated locations.

The integrated simulator is used to optimize acid stimulation of a vertical wellbore and explain the impact of operational parameters and subsurface conditions on the stimulation efficiency. The model results showed that most optimized bullheaded treatment can be significantly improved by utilizing the particulate diversion system. It is shown that that the developed skin from jammed particulate provided considerable diversion. The results also demonstrated the relation between treatment pressure, the quality of diversion, and subsurface conditions (e.g. permeability, porosity, reservoir pressure and temperature).
Characterizing Foam-Based Frac Fluid Using Carreau Rheological Model to Investigate the Fracture Propagation and Proppant Transport in Eagle Ford Shale Formation
Authors: Nath Fatick , Xiao Chongwei
Published: September 2017

In-situ stresses and heterogeneity of the formation rock are the dominant factors that influence hydraulic fracturing process. The rheology of frac fluid also significantly affects hydraulic fracturing treatment regarding fracture propagation, proppant transport, formation property alteration, and flow back process. Non-Newtonian CO2 foams stabilized by nanoparticles has been recently studied as a promising frac fluid, which is advanced in less water contents, proppant placement, fast clean, and maintaining conductive channels. For the application of the new frac fluid for unconventional reservoir development, it is critical to investigate fracture propagation and proppant transport using CO2 foams.

This study simulated hydraulic fracturing and proppant transport by viscous gas foams in a horizontal well perforated in Eagle Ford Shale formation of Zavala County, TX. A 3D numerical model was setup with heterogeneous reservoir properties using a commercial fracturing simulator - GOHFER. To represent formation heterogeneity, the rock mechanical properties were derived from well logs including Gamma Ray, Resistivity, Neutron Porosity, and Density Porosity logs, characterized by Young's modulus (3 × 106 ~ 6 × 106 psi), Biot constant (0.6 ~ 0.8), and Poisson's ratio (0.2 ~ 0.4). The flow behavior of CO2 foams stabilized by nanoparticles was characterized by Carreau rhelogy model based on the experimental data. During the pumping schedule for multistage fracturing process, the effects of variable injection rate (20 ~ 40 BPM), CO2 foams quality (50 ~ 80 %), incremental proppant distribution (0 ~ 5 PPA), and fluid leakoff were investigated.

The results showed that a laterally un-even shape of fracture propagation profile was developed during multi-stage CO2 fracturing, which represents the reservoir heterogeneity with varying in-situ stress and poroelastic properties. The results also indicated that the rheology of frac fluid significantly influences the fractures propagation. As the viscosity of CO2 foams increases with variation of foam quality from 50% - 80%, fracture width increases but fracture length decreases. The fluid loss during fracturing was quantified by pressure dependent leakoff approach. For different CO2 foams quality (50% - 80%), fluid leakoff rate decreases with increasing the CO2 foam quality.

This study provides a pioneering insight and improved fracture treatments design by non-Newtonian frac fluid - CO2 foams application with increased fracture conductivity and efficiency, which is vital for hydrocarbon exploitation from unconventional reservoirs.
Effect of Dilute Acid on Hydraulic Fracturing of Carbonate Rich Shales – Modeling Study
Authors: Teklu T. , Amini K. , Park D. , Jung H. , Abass H. H.
Published: September 2017

In Teklu et al. (2017a, and 2017b) matrix and fracture permeability of carbonate rich and clay rich shale cores were measured before and after exposing the core samples to spontaneous dilute acid imbibition. In this study, effect of brine and dilute acid imbibition on long term production of shale gas reservoir is investigated using numerical modeling approach.

Experimental observations show that: (1) matrix permeability of clay rich shale samples are usually impaired / damaged by dilute HCl imbibition. This impairment is due to both the clay swelling and related issue of brine (within the dilute HCl solution) and rock-acid reaction. (2) Matrix permeability of calcite rich shales improved with dilute acid imbibition. (3) Effective fracture permeability of un-propped (natural fracture) calcite rich and clay rich shales are reduced by dilute acid imbibition, this is because of "rock softening" and "etching/smoothing" of fracture roughness on the "fracture faces". (4) Propped permeability of clay and carbonate rich shales decrease with brine imbibition, and permeability further decreased after dilute acid imbibition. The further decrease in permeability and porosity after acid imbibition is caused by three phenomena: (a) rock weakening by rock-acid reaction, (b) further proppant embedment during repeated testes vs. stress, and (c) scale precipitation. These observations are similar to results reported in Teklu et al. (2017a and 2017b).

Modeling results show that: (1) For carbonate rich shale reservoirs, despite dilute acid injection/imbibition/fracturing can cause considerable damage to propped fractures and natural fractures (mainly due to rock softening/weakening, fracture roughness damage, and proppant embedment), it can still lead to considerable production improvement This is mainly caused by the matrix permeability improvement which leads to improvement in stimulated reservoir volume. (2) For clay rich shale reservoirs, both brine (slickwater) and dilute acid imbibition/injection/fracturing reduces hydrocarbon production, due to damages caused in to propped fractures, natural fractures, and matrix. Therefore, dilute acid injection or imbibition is recommended pre, post, or during hydraulic fracturing of carbonate rich shale reservoirs (but not for clay rich shale reservoirs) Moreover, slickwater fracturing in clay rich shale reservoirs can create considerable formation damage and decrease in hydrocarbon production, hence, dry gas (such as N2, CO2, LNG, etc.) might be an alternative solution hydraulic fracturing of in clay rich shale reservoirs.
Activity-Based Costing: Helping Small and Medium-Sized Firms Achieve a Competitive Edge in the Global Marketplace
Authors: Foroughi Abbas , Kocakulah Mehmet , Stott Ann , Manyoky Lionel
Published: September 2017

Since the 1970s, Activity-Based Costing (ABC) has enabled companies to identify the true costs of processes and products and to make sound decisions related to the profitability and expense of the products they produce, as well as the effectiveness of their manufacturing and business processes. This paper explores the advantages of activity-based costing vs. traditional costing systems and presents arguments for the potential benefits to the world’s millions of Small to Medium Businesses (SMEs) from implementing ABC. Issues related to the implementation of ABC are discussed. A framework for ABC implementations in SMEs is presented that shows the variables (characteristics of SMEs and implementation challenges) that can impact the ABC implementation process, and/or ultimately, implementation outcomes.
Free independent tourism as a tool of personal inculturation
Authors: Рябова Татьяна , Ryabova Tatyana , Эртман Елена , Ertman Elena
Published: September 2017

This article is dedicated to the free independent tourism as an effective tool of personal inculturation that considers being facultative learning of domestic culture and other cultures’ values. An accumulation and translation of personal ideas about the society, historical events, and cultural heritage takes place during an inculturation. In the same time, the culture in all variety of forms of its expression is one of basic elements of traveler’s interest and the dominating idea of tourists’ activity. Free independent tourism as a kind of social and cultural activity reflecting the individual human interests, including the interests of learning the domestic and world cultural values, and ensures the process of personal inculturation. The main social and cultural functions of independent tourism, that permit to realize the key aspects of inculturation, are defined in this article. The specific features of realization of these functions in different kinds of independent tourism are also showed. During empiric research, which results are presented in this article, the demographic characteristics of independent tourism are revealed. The structure of tourists’ motivation in organized independent trips is defined; the complex of social and cultural demands of independent tourists and the grade of their participation during inculturation are investigated. The empiric data permit to conclude that the inculturation which is ensured with different kind of human participation in the different forms and kinds of social and cultural activity is rather well realized through independent tourism. Free independent tourism which is being actually dynamically developed, ensures the following aspects of inculturation, such as the continuous education in its facultative forms; learning of variety of cultural heritage interpretations; the realization of all spectrum of leisure’s demands (including cognitive, creative, communicative and others) by the independent tourists, the stimulation of travelers activity during learning, translation and saving of cultural values.
Formação inicial docente: em busca da qualidade da educação pública (Initial teacher training: in search of the quality of public education)
Authors: Marim Vlademir , Bernardes Maria Beatriz Junqueira
Published: September 2017

O objetivo deste trabalho é analisar se as intenções dos licenciandos do PIBID, dos subprojetos desenvolvidos em um dos campi da Universidade Federal de Uberlândia (UFU), se estão relacionadas com as atividades desenvolvidas em cada subprojeto e se essas estão de acordo com os objetivos determinados pela CAPES. Analisou-se 210 cartas de intenções selecionadas referentes aos licenciandos cadastrados nos 8 subprojetos da UFU. Os candidatos alegaram que veem no PIBID a possibilidade de adquirem conhecimentos pessoais participando do subprojeto e direcionam sua intenção para uma melhorar a formação acadêmica, entre outras. Afirma-se que o referido programa tem propiciado aos licenciandos: vivência em diferentes realidades escolares, levantamento do diagnóstico das condições do trabalho docente e, o ensino dos conteúdos escolares.
Princípios e práticas para formação de professores em ambiente escolar: o movimento das ações estabelecidas em um grupo pibidiano (Principles and practices for teacher training in school environment: the movement of actions established in a PIBID group)
Authors: Souza Neusa Maria Marques de
Published: September 2017

Neste artigo relata-se uma pesquisa cujo objetivo foi investigar aspectos potencializadores da apropriação do conhecimento sobre atividade de ensino, emanados dos princípios e práticas de uma proposta de formação de professores no ambiente escolar, sustentada na teoria Histórico-Cultural com enfoque na Teoria da Atividade. Os dados foram coletados em um grupo constituído pelo Programa Institucional de Bolsa de Iniciação à Docência (PIBID), através de questionários, entrevistas, portfólios e e-mails. A análise documental baseou-se no decreto nº 6.755, que estabeleceu os princípios dessa formação, e a análise das práticas de formação baseou-se no método estruturado pelo materialismo-dialético, unidade organizada por cenas que compõem episódios e conduzem à identificação dos elementos estruturantes do processo. As falas dos integrantes do grupo convergem para a melhoria da qualidade na formação inicial e contínua dos professores, mas evidências revelam uma prática com ações e reflexões pontuais, restritas ao cumprimento do programa, limitadas ao saber fazer. Discussões coletivas e elaboração conjunta dão lugar às ações individuais que não se constituem objeto mediador dos integrantes do grupo no movimento formativo.
Ações do PIBID de Matemática/UFRN e a formação de professores (PIBID Mathematics UFRN subproject’s actions and teacher education)
Authors: Cury Fernando Guedes , Sousa Giselle Costa de de , Pontes Mércia De Oliveira
Published: September 2017

Considerando a importância de programas como o PIBID para a formação de professores em geral e, particularmente, de Matemática, o presente trabalho versa sobre o relato da trajetória de um dos mais antigos subprojetos da área que ainda tem suas atividades vigentes e com ações exitosas que são aqui compartilhadas juntamente com seus resultados e impacto na formação dos envolvidos, sejam eles licenciandos, supervisores, alunos da Educação Básica e ainda demais membros das comunidades escolares envolvidas e da Universidade. Nosso relato destaca, portanto, como discussões da literatura sobre a formação docente foram levadas a cabo em nossas atividades de ensino, pesquisa e extensão ligadas ao PIBID.
Formação de professores e resistência docente: o exemplo do PIBID (Teacher education and teaching resistance: the PIBID example)
Authors: Soares Marcos De Oliveira
Published: September 2017

O presente artigo apresenta uma reflexão acerca dos bons resultados alcançados na formação docente por meio do Programa Institucional de Bolsas de Iniciação à Docência (PIBID), em particular no curso de Licenciatura em Geografia da Universidade Federal de São Carlos campus de Sorocaba. Buscou-se, por meio da metodologia de narrativas, realizar uma reflexão sobre o programa e as atividades desenvolvidas ao longo de um período de quatro anos por estudantes da Licenciatura que repensaram sua formação docente e a função social da profissão que escolheram desenvolver ao longo de suas vidas.
Redundancy as a Design Principle for Building a Strategically Robust Control System
Authors: Ajisafe Bukola Badeji- , Adetunmbi A. O.
Published: September 2017

Redundancy is the existence of more than one means for performing a given function, Similar to many robust biological systems [6], strategically robust systems use multiple redundant pathways, in this case so that saboteurs cannot benefit by knocking out single components. This approach might be particularly valuable for systems that need to be strategically robust against evolving enemies. By deploying multiple redundant defense pathways, the host can influence the evolutionary trajectory of a pathogen population. Redundant defense mechanisms reduce the selective advantage to the pathogen of knocking out a single mechanism [3]. This, in turn, greatly increases the difficulty of the adaptive search problem that the pathogen faces when looking for a weak point in the defenses of the host.
Probabilistic linkage of national immunisation and state-based health records for a cohort of 1.9 million births to evaluate Australia’s childhood immunisation program
Authors: Gidding Heather F , McCallum Lisa , Fathima Parveen , Snelling Thomas , Liu Bette , De Klerk Nicholas , Blyth Christopher C , Sheppeard Vicky , Andrews Ross M , Jorm Louisa , McIntyre Peter B , Moore Hannah C
Published: September 2017

IntroductionSeveral countries have developed national immunisation registers, but only the Nordic countrieshave linked their registers to other health data in order to comprehensively evaluate the ‘real world’effectiveness of vaccines. Nordic countries can link datasets deterministically using the nationalperson identifier, but most countries, including Australia, don’t have such an identifier to enablethis type of linkage.

ObjectivesTo describe the process for assembling a linked study cohort that will enable the conduct ofpopulation-based studies related to immunisation and immunisation policy.

MethodsNational death and immunisation databases along with state health data (notifications of vaccinepreventable diseases, perinatal data, hospital admissions and emergency department presentations)up until December 2013 were probabilistically linked (using demographic details) for children bornbetween 1996 and 2012 in two states: Western Australia and New South Wales (42% of Australia’spopulation, combined).

ResultsAfter exclusions there were 1.95 million children in the study cohort (live born children withboth a birth and perinatal record which represents 97.5% of all live births in the state perinataldata collections - our source population) and 18.0 million person years of follow up (mean: 9.2years per child). The characteristics of children in the cohort were generally similar to those onlyincluded in state perinatal databases and outcome measures were in keeping with expected figuresfrom unlinked data sources. However, the lack of a dynamic national population register meantimmigrants could not be included.

ConclusionsWe have been able to develop a similarly comprehensive system to the Nordic countries based onprobabilistic linkage methods. Our experience should provide encouragement to other countrieswith national immunisation registers looking to establish similar systems.
Un soneto del autor de "La estrella de Sevilla"
Authors: Serís Homero
Published: September 2017

En este número no se incluyeron resúmenes ni palabras clave.
La novela como retrato: el arte de Francisco Delicado
Authors: Wardropper Bruce W.
Published: September 2017

En este número no se incluyeron resúmenes ni palabras clave.
El problema de la realidad en el "Quijote"
Authors: Predmore Richard L.
Published: September 2017

En este número no se incluyeron resúmenes ni palabras clave.
Sobre la génesis de la "Sonata de estío"
Authors: Fichter William L.
Published: September 2017

En este número no se incluyeron resúmenes ni palabras clave.
Borges y el lenguaje
Authors: Barrenechea Ana María
Published: September 2017

En este número no se incluyeron resúmenes ni palabras clave.
Viajes de españoles por la España del siglo XVIII
Authors: Helman Edith F.
Published: September 2017

En este número no se incluyeron resúmenes ni palabras clave.
Interioridad y exterioridad en Unamuno
Authors: Blanco Aguinaga Carlos
Published: September 2017

En este número no se incluyeron resúmenes ni palabras clave.
O. H. Hauptmann, Escorial Bible I.j.4. Volume I: The Pentateuch. University of Pennsylvania Press for Grinnell College Press, Philadelphia, 1953; xii + 320 pp.
Authors: Levy Raphael
Published: September 2017

Se reseñó el libro: Escorial Bible I. j. 4. Volume I: The Pentateuch.
Cinco dramas inspirados en las rimas de Bécquer
Authors: Johnson Harvey L.
Published: September 2017

En este número no se incluyeron resúmenes ni palabras clave.
Luis Flórez, La pronunciación del español en Bogotá. Bogotá, 1951; 390 pp. (Publicaciones del Instituto Cam y Cuervo, 8) .
Authors: Boyd-Bowman Peter
Published: September 2017

Se reseñó el libro: La pronunciación del español en Bogotá.
Mariano Baquero Goyanes, El cuento español en el siglo xix. C .S.I.C., Madrid, 1949; 699 pp. (RFE, anejo 50) .
Authors: Hart Jr. Thomas R.
Published: September 2017

Se reseñó: El cuento español en el siglo xix.
Can the incineration of Municipal Solid Waste pose occupational and environmental radiation hazards?
Authors: Carvalho Fernando P.
Published: September 2017

An evaluation of the incineration process of municipal solid waste is made for identifying potential radiation hazards. Sources of radiation considered are the radioactive materials wrongly eliminated into municipal waste (e.g., industrial and medical waste containing radioactive sources, such as cesium-137 and technetium-99m) and also radionuclides of natural origin (e.g., radium-226, polonium-210) contained in common materials disposed as domestic waste. Through burning, radionuclides from both origins may be released as gases and radioactive particles into the atmosphere and build up in the facility and in the environment nearby. Results from model calculations indicated that naturally-occurring radionuclides released into the atmosphere likely originate a small enhancement to the natural radiation background. However, in the case of man-made radioactive sources mixed with the municipal solid waste the radioactive emissions may attain and eventually exceed the radiation dose limit for members of the public. These results support the recommendation that for natural radionuclides present in incinerated waste a careful evaluation of the risk of exposure to ionizing radiation, actually in accord to the European Directive 2013/59/EURATOM establishing the basic safety standards for radiation protection, must be performed and model calculations validated with radioactivity measurements. Regarding the potential release of radionuclides from man-made radioactive sources it is recommended the installation of portals equipped with radiation detectors to check municipal solid waste on admission in the facilities and prevent such radiological accident.
Indoor radon levels and total gamma dose rates measurements in Portuguese thermal spas
Authors: Silva A. S. , Dinis M. L.
Published: September 2017

In this study, an assessment of indoor radon concentration and gamma dose rates were carried out in 16 Portuguese thermal spas. Indoor gamma dose rates measurements were made using a Geiger counter (Gamma Scout â€“ GS3) and radon concentration measurements were carried out using CR-39 detectors. The detectors were exposed for an extended period of time (in average 42 days). The results showed that gamma doses rates are generally low but, in several cases, radon concentration exceeded national as well as international standards, namely the reference level recommended by the Directive 2013/59/EURATOM (300 Bq/m3) and the threshold for protection (400 Bq/m3) from the Portuguese legislation. The annual effective doses deriving from external radiation (gamma dose rates) and indoor radon concentration showed the need to implement measures to optimize the radiation protection of the workers against ionizing radiation.
SAFETY, TOLERABILITY AND BIOEQUIVALENCE ASSESSMENT OF A DISPERSIBLE TABLET FORMULATION OF PYRAZINAMIDE
Authors: Sarkar Atreyee , Davey Mrunal S , Savalia Atul , Dhanure Shivanand
Published: September 2017

Pyrazinamide is a widely used drug for the treatment of tuberculosis. A 150 mg Dispersible Tablet (DT) formulation of the drug was prepared by Micro Labs, a generic drug company. The formulation was developed for easy administration into paediatric patients. It was tested for bioequivalence in healthy adult human volunteers in fasting condition. A total of 36 subjects were enrolled in the study and all the 36 subjects completed both the two periods of the study without showing major adverse events. The pharmacokinetic parameters determined for bioequivalence were Cmax and AUC0-t. The two parameters were within the limit of bioequivalence criteria. The 150 mg DT formulation developed by Micro Labs was found to be bioequivalent to 500 mg immediate release tablet formulation of Riemser Pharma. Both the formulations were safe and well tolerated among the tested human subjects. No major adverse events were observed.
VOMITING IS A POTENTIAL ADVERSE DRUG REACTION FOR LEVOMILNACIPRAN
Authors: Sarkar Atreyee , Dhanure Shivanand
Published: September 2017

Levomilnacipran is a drug used to treat depression. Micro Labs is a generic drug company which had developed an extended release formulation of Levomilnacipran 120 mg capsule. Two studies were conducted to assess the safety, tolerability and bioequivalence of the extended release formulation of 120 mg Levomilnacipran capsules. A total of 42 subjects had been included for each of the fasting and fed studies. Out of them, 30 subjects completed the fasting study and 28 subjects completed the fed study. Pharmacokinetic parameters like Cmax, AUC0-t, AUC0-inf, Tmax, Kel, t1/2 and %AUCextra were calculated for Levomilnacipran in order to compare the bioavailability of the test and reference formulations. The studies were conducted in healthy human volunteers in both fasting and fed conditions as per the US regulatory requirements for conduct of bioequivalence studies. The formulations were found to be bioequivalent to each other. Vomiting was observed as a major adverse reaction.
Formulation and Evaluation of Mouth Dissolving Tablets Containing Losartan Potassium Using Natural Superdisinigrants
Authors: Kumari Bhimi , Soni Abhishek , Singla Shivali , Goyal Sachin , Thakur Samriti , Mahant Sunidhi
Published: September 2017

Losartan potassium is used as an antihypertensive drug but it goes under first pass metabolism due do which it has low bioavailability. Fast onset of action is major concern in the management of hypertension. Therefore the aim of this study is to formulate mouth dissolving tablet of losartan potassium to improve its bioavailability, to achieve fast onset of action and increase patient compliance. Mouth dissolving tablets were prepared by direct compression method using natural super disintegrating agents (banana powder and apple pectin) and evaluated for pre-compression parameters and post compression parameters such as appearance, dimensions, hardness, weight variation, friability, wetting time, dispersion time, water absorption ratio, disintegration and dissolution study. According to results of optimized batches it has been concluded that formulation batch F9 was an ideal batch which contain banana powder (2.5%) and cross povidone (2.5%) showed least disintegration time that is 26 seconds and maximum drug release of (99.68%) within 12 minutes and was best among all the formulations.
LESÃO RENAL GLOMERULAR: PROCESSO INFLAMATÓRIO E O PAPEL DAS QUIMIOCINAS
Authors: De Abreu Thalles Trindade , Silva Neves Núbia Chouchounova , Alves Lucas Ferreira , Otoni Alba
Published: September 2017

As lesões renais podem ser explicadas, de um modo geral, por agressões que causam danos às células e/ou tecidos e à resposta inflamatória gerada por esse processo a partir da ativação do sistema imune e estímulo contínuo de sua ação. Visando realizar o diagnóstico precoce da doença renal crônica e minimizar os aspectos econômicos e os impactos à vida do paciente causados pela instalação e progressão da doença renal, muitos autores procuram explicar os processos inflamatórios que são as linhas de bases de muitas doenças crônicas e os biomarcadores que participam desse processo. Este artigo tem por objetivo fazer uma revisão de literatura narrativa sobre a fisiopatologia da progressão da doença renal glomerular, bem como, as possíveis funções das quimiocinas como marcadores de progressão da doença renal.
GIÁ TRỊ CỦA VÒNG CÁNH TAY VÀ VÒNG ĐÙI TRONG ĐÁNH GIÁ SUY DINH DƯỠNG CỦA THANH NIÊN 18 - 25 TUỔI
Authors: An Nguyễn Tường
Published: September 2017

Mục tiêu của nghiên cứu này nhằm xác định hệ số tương quan giữa vòng cánh tay, vòng đùi với chỉ số khối cơ thể BMI, đồng thời tìm hiểu giá trị của hai kích thước này trong đánh giá tình trạng suy dinh dưỡng của thanh niên ở tuổi 18 - 25. Đối tượng nghiên cứu: 662 thanh niên bình thường tuổi từ 18 - 25 gồm 348 nam và 314 nữ. Phương pháp nghiên cứu được thiết kế theo điều tra ngang. Đo các kích thước nhân trắc gồm chiều cao đứng, cân nặng, vòng cánh tay trái, vòng đùi trái. Tính chỉ số khối cơ thể BMI. Phân loại tình trạng dinh dưỡng dựa trên BMI theo WHO và IOTF. Sử dụng đường cong ROC để tìm ngưỡng kết luận suy dinh dưỡng của vòng cánh tay và vòng đùi. Kết quả nghiên cứu cho thấy các kích thước nhân trắc của nam và nữ thanh niên đều lớn hơn so với điều tra cơ bản toàn quốc vào cuối thế kỷ XX. Chiều cao đứng, cân nặng và vòng cánh tay của nam lớn hơn nữ (P<0,001). Vòng đùi thì tương đương nhau giữa hai giới (P>0,05). Diện tích dưới đường cong ROC dao động từ 0,775 đến 0,873 cho thấy hiệu quả của ngưỡng kết luận đã tìm ra là tốt với vòng cánh tay < 24 cm cho nam và < 22 cm cho nữ, vòng đùi là < 49 cm cho cả hai giới. Kết luận: Có mối tương quan thuận, chặt chẽ và có ý nghĩa thống kê (P < 0,0001) giữa chỉ số khối cơ thể BMI với vòng cánh tay và vòng đùi ở cả hai giới. Ngưỡng kết luận suy dinh dưỡng là vòng cánh tay < 24 cm cho nam (Se 80,7%; Sp 71,5%) và < 22 cm cho nữ (Se 72,1%; Sp 89,5%), vòng đùi là < 49 cm cho cả hai giới (Se 72,2%; Sp 67,0% ở nam và Se 73,3%; Sp 86,8% ở nữ).
NGHIÊN CỨU QUÁ TRÌNH SẤY THÓC BẰNG THIẾT BỊ SẤY NĂNG LƯỢNG MẶT TRỜI KIỂU ĐỐI LƯU TỰ NHIÊN
Authors: Cường Đỗ Minh , Hòa Phan
Published: September 2017

Thiết bị sấy năng lượng mặt trời kiểu đối lưu tự nhiên dùng để sấy thóc có kết cấu đơn giản, dễ sử dụng và giá thành thấp, phù hợp với quy mô hộ nông dân, có thể sử dụng vật liệu có sẵn ở địa phương để chế tạo. Khi sử dụng thiết bị này, thời gian sấy rút ngắn nhiều so với phơi nắng tự nhiên khi trong cùng một điều kiện như nhau, đảm bảo số lượng và chất lượng của thóc sấy, không bị các côn trùng và chim chuột thâm nhập phá hoại, phòng ngừa được mưa ẩm. Thiết bị này cũng có thể được sử dụng để sấy một số sản phẩm nông nghiệp khác.
PHÂN LẬP VÀ TUYỂN CHỌN MỘT SỐ CHỦNG VI KHUẨN CỐ ĐỊNH NITƠ SỐNG TỰ DO TRONG ĐẤT TRỒNG RAU MÀU Ở TỈNH THỪA THIÊN HUẾ
Authors: Khoa Trần Đăng , Phương Trần Thị Xuân , An Trần Thị Xuân
Published: September 2017

Trong số 44 chủng vi khuẩn cố định nitơ tự do phân lập được từ 12 mẫu đất đất trồng rau màu ở Thừa Thiên Huế, có 25 chủng có đặc điểm khuẩn lạc tương đối điển hình. Chủng CH2 sinh trưởng phát triển tốt với nguồn cacbon là sacharoza, nhiệt độ 260C, pH = 7. Chủng KL2 sinh trưởng phát triển tốt với nguồn cacbon là glucoza, nhiệt độ 300C, pH = 7,5. Chủng PM2 sinh trưởng phát triển tốt với nguồn cacbon là glucoza, nhiệt độ 280C, pH = 7,5. Các chủng này có tốc độ sinh trưởng mạnh, khả năng lây nhiễm cao, có khả năng cạnh tranh với các nhóm vi sinh vật khác trong môi trường, đồng thời chúng còn có khả năng kích thích sự sinh trưởng, phát triển và năng suất xà lách, trong đó nổi bật nhất là chủng KL2.Từ khóa: Vi khuẩn, cố định Nitơ, phân lập, tuyển chọn, Thừa Thiên Huế.