bluuebunny/crossref_metadata_2025 huggingface dataset:
Productivity Study of Sand Control Performance of a Mature Developed Reservoir in the Niger-Delta
Authors: Nwosu Obiora , Olagunju Adeyemi , Agwuncha Frank , Odumodu Somtochukwu , Oghene Nkonyeasua , Ori-Jesu Efeoghene
Published: July 2017

The productivity of oil wells depends on a lot factors such as and not limited to environment of deposition, reservoir thickness, permeability, reservoir drive mechanism, drain hole length and formation damage at the near well bore region. The productivity of oil wells can also be linked to the effectiveness of the sand control method deployed in the well. Sand control methods play very important roles in safeguarding our assets, maximizing production from assets and reducing life-cycle OPEX for the well.

This paper presents a comparative approach towards understanding the effect of different sand control methods on productivity of wells completed in a mature reservoir in the Niger Delta. The methodology involves the use of statistical comparison of the production performance of 4 sand control methods installed in the XYZ reservoir in the YED field. The approach considers the productivity performance, the average sand reliability index, and the intervention frequency ratio.

The productivity performance of the completed conduits on XYZ reservoir shows that conduits completed with Slotted Liners showed impressive production performance as well as low sand production, while the wells completed with IGP had better production performance when compared to other sand exclusion methods. The drainage points completed with SCON showed average production performance, with high sand production averaging around 25-30 pptb for the completed conduits. The conduits that were completed with MCUGP showed below average production performance as well as high sand production.

The results in this work will help provide an easy guide to sand control selection as it concerns productivity in the Niger-Delta region. It will also deepen the understanding of the performance of different sand control methods in the Niger-Delta Region.
Integration of Pulsed Neutron Log Data: A Cost Saving-Value Driven Approach for Justification of Well Intervention
Authors: Maxwell-Amgbaduba Sunday , Okpere Adrian , Williams Omolara
Published: July 2017

The ability to perform remedial activities to enhance production from existing wells in order to extend field life is an essential component of brown field management. Predicting the movement of hydrocarbon/water behind casing and estimating remaining hydrocarbon column ensures economic value on proposed activities can be quantified. Fluid contact measurements over time are useful for tracking reservoir performance, planning work over and enhanced recovery strategies, as well as diagnosing production problems such as water influx.

This paper highlights the value of integrating pulsed neutron log data with other subsurface data and models to provide a robust solution in well intervention. The case study demonstrates how pulsed neutron log data has helped resolve multiple challenges such as; Estimation of remaining hydrocarbon column and volume, perforation placement uncertainty, optimizing reservoir block development strategy and ensure robustness of reservoir dynamic models.

Results from the case study show that integrating pulsed neutron log data in a work-over intervention could amount to huge cost savings (>$10,000,000 dollars in this case) in proposed operation. Additionally, calibration of acquired log data with existing dynamic models led to perforation optimization which gave resource volume increase of about 15% from two reservoirs against pre-estimated volume.
Multi-Method of Estimating Lifecycle Technical Ultimate Recovery in a Natural Depletion Gas Reservoir
Authors: Tunji Bakare , Waazor Korubo , Olugbenga Daodu , Suleiman Ahmed , Chima Emelle
Published: July 2017

Gas reservoir development at inception is often linked to detailed surface infrastructure development and long term contractual agreements with only a few appraisal wells. A thorough and detailed technical estimation of the size of the pie is an important step in the right direction. This is characterized by seismic acquisition and interpretation, scanty appraisal wells proving useful reservoir and fluids properties data and contact tagging. Calibration of regional properties with nearfield analogue can also be quite useful.

All these form the basis of the field/Reservoir development plan. For a gas development, the optimum development wells depend on a variety of factors identified at the field development stage often targeting the most viable crestal part of the reservoir for optimal development. Post drilling of development wells where reservoir static properties are fairly known and at the early stage of production when there is paucity of production data, it is imperative to adopt a robust approach to evaluate the technical UR.

In early producing life of the reservoir when reservoir pressure data is needed perhaps the most, long shuttin-in to take static pressures can be abit problematic due to commercial commitments. There is heavy reliance on planned and unplanned shutins to take useful pressure data used in calibrating reservoir models.

This paper takes a critical look at multiple approaches to estimating robust ultimate recoverable gas volumes with reservoir geology as an essential guide using tow distinc approaches; Detailed 3D simulation model and P/Z estimate method using Piper, McCain and Corredor z factor estimates. Lastly the range of uncertainties of the input data was used to estimate the low base and high cases.
Impact of Intra-Reservoir Faults on Fluid Connectivity and Recoverable Volumes in Reservoir Blocks That Have Shown Over Production – A Case Study of a Niger Delta Field
Authors: Orekoya A. O , Oghene N , Olagunju A , Odumodu S , Ori-jesu E , Nwosu O , Agwuncha F
Published: July 2017

The impact of intra-reservoir faults on fluid connectivity and recoverable volumes in any reservoir depends principally on structural uncertainties (fault extent, fault throws, fault zone, fault heave, fault sealing capacities etc.) associated with the reservoir.

This paper focuses on the integrated approaches used to determine block by block fluid connectivity, re-assignment of estimated hydrocarbon initially in-place volume and its associated recoverable volumes in different reservoir blocks in view of production performance and complex fault architecture in the field.

In this study, we have explored the feasibility of determining fluid connectivity across reservoir blocks and their associated recoverable volumes by integrating reservoir performance (post-production data) with the reservoir structural uncertainties. Over 50 wells have been drilled in the field and their penetrations spread across the reservoirs. Pressure data were acquired across most of the blocks in the reservoir.

The reservoir is sub-divided into separate blocks and it has over 25 years of production with evidence of over-production (Np > Ultimate Recoveries) experienced in some of these blocks. This over-production triggered the need to integrate available data (Performance, Pressure data, Fluid Contacts, structural morphology etc.) to re-evaluate the impact of the intra reservoir faults on the estimation of the hydrocarbon in-place volume and recovery in the field.

The integrated approach has aided the re-estimation and re-assignment of the associated volumes on a block by block basis thereby promoting the opportunity for a robust infill well planning and further development of the field.
3D Static Modelling of An Offshore Field in the Niger-Delta
Authors: Duvbiama Omolara , Ikomi John
Published: July 2017

The complex nature of deep water sediments requires the use of a full field 3D static model to enable better understanding of the reservoir characteristics of the field. This study focuses on the 3D static modelling of the 458 reservoir in Botti field to facilitate field development.

The Botti field is a partially appraised field located about 20km offshore Nigeria. A total of four wells have been drilled in the field and only two wells encountered the target reservoir. The depositional environment is mainly deep water slope channel sands with some submarine fans.

The morphological uncertainties relating to the slope channel sands deposits, requires a detailed 3D static model which defines reservoir characteristics such as channel orientation, continuity and connectivity.

The reservoir evaluation involved the use of core-log integration to identify the facies in the reservoir, seismic interpretation as well as correlation using a sequence stratigraphic approach to understand the reservoir architecture and property distribution.

Using the information obtained from analysed data, an analogue field and literature review, a conceptual model was proposed for the reservoir which served as a precursor for a 3D static model.

To quantify the uncertainties associated with the In-place volume, a monte carlo simulation was done to obtain the P10, P50 & P90 STOIIP values.

Sensitivity analysis using a tornado chart to evaluate impact of STOIIP parameters on the hydrocarbon in-place volumes were done and it showed that N/G had the highest impact on the STOIIP.

The results of this study show that the 458 reservoir is a weakly confined channel complex system made up of the 458_1, 458_2 & 458_3 channel complexes.

A P50 STOIIP was estimated as 150MMstb. This is about 43% reduction in the initial volume calculated before the full field static model.
Thin Oil Rim Development in a Mature Field – An Okan Field Experience
Authors: Ogbuagu Frank , Afolayan Femi , Esan Femi , Obot Nsitie , Adeyemi Ganiyu , Okpani Olu
Published: July 2017

This paper summarizes the strategy adopted in the development of two thin oil rim reservoirs in Okan Field, Offshore Niger Delta, Nigeria.

Its objective is to elucidate the strategy, engineering analyses, subsurface assessment and production procedures set in place to optimally develop the reservoirs.

Both reservoirs have oil thickness of <30 ft with gas thickness of >100 ft. The adopted development strategy for the two reservoirs involves the drilling of 4 wells, 2 in each reservoir, to drain the remaining oil reserves, prior to gas development.

Because of structural and fluid contact uncertainties, soft landing was incorporated into the well designs. Shale-to-shale correlation was used for accurate horizon depth prediction and detailed simulation models with local grid refinements were employed to determine optimum well orientation, landing depth, lateral length and aquifer properties. Details on their use to maximize value are shared.

While drilling, Azithrak™, a Baker Hughes tool, was used in geosteering the lateral well section to determine distance of well to nearest conductive zone as part of the oil-water contact tracking. All available data - logs, cuttings, reservoir pressures and production data - was incorporated and used to validate fluid contacts data because of the impact of landing depth relative to the fluid contacts on oil recovery. Simulation results and operational constraints were used to set acceptable production limits to ensure delivery of target reserves.

All the four wells have been successfully drilled and completed, with the wells landed successfully within the thin oil column, at the optimized distance from the fluid contacts, with the wells producing at <0.55 percent water cut. Initial production performances of the four wells are in line with static and dynamic assessment forecasts.

Lessons learned and challenges encountered during this development are also captured in this paper.
Cost Effective Appraisal Strategy Using Decision Tree Analysis for Optimal Field Development Planning
Authors: Awasthi Amit , Okonkwo Arinze , Afulukwe Chuks , Effiom Oghogho
Published: July 2017

Project B, consisted of five discrete subsurface elements; Remaining developed volumes, Infill opportunities, Resources in THIN-BED and Exploration prospects. These subsurface elements were at different levels of technical maturity and were planned into a single project maturity timeline with shared i(mpact on facilities. Based on level of technical maturity, two of the subsurface elements (THIN-BEDs, and Exploration prospects) were considered as requiring an appraisal plan to further mature their development options.

In anticipation of "lower for longer" oil price scenario, the appraisal strategy for the discrete elements was integrated and designed utilizing decision tree analysis. The appraisal strategy was developed for the immature subsurface elements, consisting of a variety of appraisal methods, each cost effectively geared towards fit for purpose data acquisition to mitigate the key uncertainties and enable further oil development in the field. Decision tree analysis for each of the immature subsurface elements, describing the possible outcomes with associated probability of success, was performed including fit for purpose economic analysis to understand & decide the value add and timing of appraisal.

This integrated appraisal strategy including decision tree analysis; provided the basis and strong logic to decide whether the appraisal is worthwhile and when is the most optimal time to do it.

This methodology demonstrates how the quality decision around field development planning could be made by using decision tree analysis to evaluate the value of the components, using associated uncertainty around estimated ultimate recovery. Furthermore, this analysis also is utilized to understand the timing of appraisal vis-a-vis the overall field/project development.
Comparative Approach to Relative Permeability Predictions
Authors: Mamudu Abbas , Taiwo Seun , Olafuyi Olalekan
Published: July 2017

Based on Welge's solution of the flow equation, a method (JBN technique) to calculate the individual phase relative permeabilities from displacement data was developed for the first time in 1959. It's the most commonly used data reduction method for obtaining relative permeability relationships from unsteady state data. Similar to the Welge method, differentiation of data is required and negligible capillary end effects are assumed when using the JBN method. To apply the JBN method, information on pore volumes of fluids injected and produced, the pressure drop across the porous medium and fluid viscosities is needed. This method generally gives relative permeabilities over a fairly small saturation range, which varies depending on the relative mobilities of the flowing fluids. In order to improve the results of this method, many researchers have come up with different techniques in their JBN analysis including the cubic spline numerical modeling technique (CSNMT) discussed in this research. This paper presents relative permeability data obtained from comparative analysis of the JBN method with different approaches. The differentials of second order Lagrange interpolating polynomial and cubic spline numerical modeling technique (CSNMT) were all considered in the JBN analysis. The relative permeability curves were then analyzed and the best method was chosen. The results of all the different methods employed in the JBN analysis do not match perfectly throughout the entire saturation range. The errors in the use of the differentials of second order Lagrange interpolating polynomial on more than three data point are very substantial. The results obtained from the application of cubic splines are more representative of the relative permeabilities from the field cores.
Gas Development in an Emerging Economy: Nigerian Case Study
Authors: Tahir Salahuddeen M. , Udezi Edwin E.
Published: July 2017

Nigeria aims to stimulate its economy by taking advantage of its gas reserve base to drive power generation and industrial growth. Several steps have been taken to achieve this. The study aims to identify the impediments to the desired results and proffer solutions to fast track the implementation of existing policies and structures.

To identify the current challenges militating against fast tracked gas development for the economic benefit of Nigeria, one needs to appreciate the successes gained so far by the nation. The gas industry pre development of the Nigeria LNG Project is considered. National power generation data is presented pre and post the advent of gas generating power plants. National gas demand data over a 20 year period is analyzed and compared to reserve growth. Gas midstream infrastructure pre and post approval of the Nigerian Gas Master Plan (NGMP) in 2008 is identified and compared. Effects of implementation of the commercial frameworks for upstream development and the Gas Master Plan are also analyzed.

Although a lot of successes have been recorded by the country, certain impediments have hampered the desired national economic growth. The following although still existing, are being addressed by the various stakeholders; Gas supply issuesPSC Gas TermsFunding challengesNon alignment of priorities by NNPC's different JV partnersCommunity issuesSecurity issuesCompeting projects by prospective investorsNon passage of the PIGBPolicy somersault

The paper analyzes the challenges and proffers innovative solutions towards addressing the issues. These solutions will not only help to provide a different line of thought for policy makers and other stakeholders in the Nigerian oil and gas industry but will also provide a sort of "lessons learnt" for other developing countries with recent oil and gas finds to fast track the development of their gas industry thereby achieving the desired economic growth.
A New Methodology for Estimation of Three-Phase Relative Permeability Functions in Heavy-Oil Displacement Involving Instability and Compositional Effects
Authors: Taura Usman , Mahzari Pedram , Sohrabi Mehran
Published: July 2017

Simultaneous three-phase flow of gas, oil and water is a common phenomenon in enhanced oil recovery techniques such as Water-Alternating-Gas (WAG) injection. Reliable reservoir simulations are required to predict the performance of these injections before field application. However, most commercial simulators are based on Darcy-type formulation requiring the concept of relative permeability. Generally, three-phase relative permeabilities are calculated from empirical correlations, which are based on two-phase relative permeability. However, heavy oil displacement by gas or water can lead to viscous fingering due to the unfavourable mobility ratio between heavy oil and the displacing fluid. In addition, the injection soluble gases such as CO2 can result in compositional effects. Estimation of three-phase relative permeability under such conditions are extremely complex and using conventional techniques for the estimation can lead to erroneous results.

We used the result of three coreflood experiments carried out on a core to generate two-phase and three-phase relative permeability data using an improved history matching methodology that takes into account the instability and the compositional effects in the estimation processes.

The results show that a simultaneous CO2 and Water injection (CO2-SWAG) can be adequately matched using a secondary gas/liquid and a tertiary oil/water relative permeabilities. This is because contrary to WAG in conventional oil recovery, where gas and water open up separate saturations paths, in this case, the water follows the gas saturation path due it's lower resistance as a result of the CO2 dissolving in the oil and reducing the oil viscosity. It is also important to include Pc even in high permeable porous media as we observed that the inclusion of capillary pressure dampened the propagation of the viscous fingers and hence helped the front to become stabilised leading to a better sweep efficiency.
New Approaches to Gas Monetization in Nigeria
Authors: Fulford Nicholas , Aquing Felix , Meehan D. Nathan
Published: July 2017

Despite progress made in recent years and efforts of the World Bank-led Global Gas Flaring Reduction Partnership (GGFR), flaring of natural gas continues to be an environmental challenge and a waste of resources. By some estimates, as much as 3.5% of global gas production is flared or vented. In addition to wasting a non-renewable, marketable resource, flaring and venting represent a major source of avoidable CO2 and CH4 emissions that emit excessive amounts of greenhouse gas with no offsetting benefits. In the first half of 2016, Nigeria flared over 3 billion cubic meters (Bcm) (106 Bcf) of gas, with a nominal value of some US$300 MM. Excuses for flaring and venting include the costs of gathering, processing and treating gas, and the lack of infrastructure and access to funds to develop and deliver the gas into viable markets. Some financial terms for Production Sharing Contracts (PSCs) or other contracts, and low regulated gas prices, fail to properly encourage gas use. Sour gas or gas with high levels of non-hydrocarbon diluents, though not applicable to Nigerian gas, further complicates commercialization. A lack of collaboration between operators and regulators also contributes to improper development planning. Retrofitting costs and mature fields further complicate gas use.

The potential to monetize an ever increasing portion of flare gas in Nigeria has many positive benefits, including improving the environment for those living in proximity to oil and gas operations; both savings and new revenues for project sponsors; greater certainty for lenders, and the potential substitution of expensive and polluting diesel-powered applications.

Flaring and venting gas should be infrequent, brief and efficient. This paper presents a variety of ways to monetize small to medium volumes of gas, along with ways to minimize flared and vented gas. The relative volumes of gas required for a wide range of applications are reviewed, including distributed power, CNG, methanol or other GTL, mini- and micro-LNG, and other emerging technologies.
Re-Allocation of Reservoir Blocks Hydrocarbon In-Place Volume Based on Reservoir Performance and Subsurface Data Analysis in a Mature Field
Authors: Efeoghene Ori-Jesu , Adeyemi Olagunju , Frank Agwuncha , Nkonyeasua Oghene , Obiora Nwosu
Published: July 2017

Exceeding the estimated technical UR of mature fields is a valid positive risk to be considered in field development. Extending the field life of prolific fields in the Niger Delta using integrated subsurface analysis of available data is an imperative in the current "lower price for longer" oil economy.

For matured reservoirs producing beyond their estimated ultimate recovery, it is necessary to demonstrate the basis on which a revision of recovery factors can be made (SPE et al., 2007). This paper examines how the seismic, geological, production data and pressure data were integrated to arrive at the most plausible reservoir understanding for the re-allocation of In-place volumes for the Tanure field in the Western Niger Delta.

An integrated review of the field history was done on a well- by- well basis, taking into account the cross -sections and relative positions of both flowing and closed -in wells. The CO log data analysis showed the relative movement of the water influx in the field, helping to identify wells that had been shielded by sealing faults, explaining observed production performance. The pressure equivalence of the hitherto separate sub-blocks in the field proved that 75 of the sub-blocks on the various reservoir sand levels could be technically merged into 24 larger blocks. The average contacts for the new sub-blocks were estimated by petrophysical analysis of original contacts observed from open hole log data.

The re-interpretation of 3D seismic and the fault model of the geological structure, led to the revision of Stock Tank Oil Initially In Place (STOIIP) estimates to support the production figures from the maturing field (SPE/WPC, 2001). Fluid contact analysis estimated OWCs for the resulting new blocks, confirmed by pressure data history from the field. The technical recovery limits for the affected blocks were revised based on the calculated STOIIP volumes of the new blocks.
Tracheoesophageal fistula in a patient with a Left Ventricular Assist Device
Authors: Maxymiv Nicolas , Broughton Kirbie , Thakrar Shilen
Published: July 2017

Tracheo‐oesophageal fistula (TOF) is a rare complication associated with mechanically ventilated critically ill patients. Predisposing risk factors include high tracheal tube cuff pressure, and the presence of an orogastric tube. We present a case of TOF in a critically ill patient with a left ventricular assist device. Anaesthetists are often called to manage an airway for a displaced tracheal tube or one with a suspected cuff leak. Exchanging a tracheal tube is not without risk. Tracheo‐oesophageal fistula may present in a similar fashion to a leaking or displaced tracheal tube and it is critical to ensure that this diagnosis is not missed.
The use of sugammadex to reverse rocuronium‐induced anaphylaxis in the intensive care unit
Authors: Leggatt Ricki , Elkady Hatem
Published: July 2017

Rocuronium is increasingly used as the neuromuscular blocking agent of choice in the ICU due to a favourable side effect profile compared with suxamethonium. However, it potentially causes anaphylaxis with one in every 2499 patient exposures. Reports in anaesthetic literature describe the use of sugammadex as a novel treatment for rocuronium‐induced anaphylaxis, but it is not recommended for routine use. No literature specifically relating to ICU patients exists. We describe a case of severe rocuronium‐induced anaphylaxis on ICU, resistant to conventional therapy and resulting in cardiac arrest, being completely reversed by 200 mg sugammadex.
Voces en movimiento: Latinoamérica migrante dibujada por la música
Authors: Paniagua-Arguedas Laura
Published: July 2017

El artículo analiza las representaciones presentes en la música latinoamericana de inicios del siglo XXI sobre la experiencia de la migración. Se sostiene que las canciones dan cuenta de fenómenos sociales más amplios, entre ellos el surgimiento de un nuevo sujeto político migrante que contesta, resiste y se organiza frente a las situaciones de discriminación y en la defensa de sus derechos. Este cambio parece estar vinculado a eventos globales como la incorporación de la defensa de derechos humanos en el discurso popular, la difusión mediática de la situación migrante, el fortalecimiento organizativo y el reconocimiento de identidades globalizadas. © Revista Colombiana de Ciencias Sociales.
Assessment of the Current State of Internal Force and the Optimization of Cable Force for an Existing Long-span Pre-Stressed Concrete (PC) Cable-stayed Bridge
Authors: Ye Xijun , Sun Zhuo , Huang Guoqing
Published: July 2017

Introduction:

Due to the influence of load, fatigue, corrosion, natural material aging and other long-term adverse factors, the state of the internal force of a cable-stayed bridge will be changed. These long-term effects can result in the bridge not meeting specified functional requirements, and potentially resulting in structural failure. This investigation focuses on the parameter identification of a girder for a pre-stressed concrete (PC) cable-stayed bridge. Without considering the influence of cable relaxation and temperature on the girder’s geometric shape, an improved method based on the “cable force-girder’s displacement” relationship is proposed.

Method:

In this method, measurement variations of displacement and cable force are simultaneously obtained, enabling the use of an optimization method to identify parameters which need to be resolved. To verify the proposed method, a single pylon PC cable stayed bridge (2×160m) is selected as a case study. For the state of internal force, results from the case study bridge indicate that the crack resistance value of the girder no longer satisfies the demand of Generalized codes for design of highway bridges and culverts(JTG D60-2004,in Chinese). In order to adjust the internal force, cable force optimization was undertaken, whereby bending energy was taken as the objective function.

Result:

Using these results the geometric shape of the girder was restored to its initial state. The results also show that neither the crack resistance value nor the compression resistance value of the girder exceeded specified limits, and that the stress of the girder was effectively controlled.
Validation of a Vibrotactile Stimulation System Using the Wii Remote for Studies of Tactile Sensitivity
Authors: Sugimoto Eri , Sasaki Hitoshi
Published: July 2017

Background:

Vibrotactile stimuli are widely used to study the functional characteristics of the haptic sense. Although many vibrotactile stimulators are commercially available, most are expensive.

Objective:

We developed a low-cost vibrotactile stimulation system using a Nintendo Wii Remote and a personal computer. In the present study, we examined the validity and accuracy of this vibrotactile stimulation system.

Method:

In the first experiment, we measured the linearity of vibration amplitude and changes in peak vibration frequency generated by the Wii Remote as a function of activation intensity. In the second experiment, the effect of vibrotactile stimuli applied to the dorsal surface of hand on two-point discrimination threshold at the index finger was examined in twelve participants.

Results:

The peak vibration frequency was about 150 Hz irrespective of vibration intensity, which would effectively activate fast adapting type II (FAII) cutaneous mechanical receptors. The two-point discrimination threshold measured at the third pad of the index finger decreased significantly when a near-threshold vibrotactile stimulus was applied to the dorsal hand, a response termed stochastic resonance (SR). These SR results are consistent with findings in the other sensory systems, such as auditory, visual, and somatosensory systems.

Conclusion:

This newly developed stimulation system produces controllable vibrotactile stimuli useful for study of the haptic sense.
RECREATIONAL FACILITIES FOR YOUTH IN MALAYSIAN URBAN AREAS. CASE STUDIES: LEMBAH PANTAI, KUALA LUMPUR AND KOTA KINABALU, SABAH
Authors: Omar Dasimah , Omar Kamarul Ariff , Kamaludin Zuriyati , Othman Saberi , Mohd Yusoff Zaharah
Published: July 2017

Recreational facilities refer to places or buildings that provide space for any kind of leisure activities. Recreational activities are often considered to be fun and undertaken mostly by youth for enjoyment, amusement or pleasure. The level of satisfaction is, however, depends on individual’s opinion. The purpose of this study is to evaluate the perception level of youth living in urban neighbourhoods towards the recreational facilities provided in their areas. Data from case studies were collected through questionnaire survey involving 540 respondents aged between 15-24 years old. Results of analyses show that respondents were more aware of the availability of recreational facilities related to popular sports. Additionally, mean analysis show that respondents perceived the provision of recreational facilities in their areas as acceptable.
A Smartphone App for Adolescents With Sleep Disturbance: Development of the Sleep Ninja
Authors: Werner-Seidler Aliza , O'Dea Bridianne , Shand Fiona , Johnston Lara , Frayne Anna , Fogarty Andrea S , Christensen Helen
Published: July 2017

Background

Sleep disturbances are common in young people and have consequences for academic, social, emotional, and behavioral development. The most effective treatment is cognitive behavioral therapy for insomnia (CBT-I), with evidence suggesting that it is efficacious even when delivered digitally.

Objective

There are no commercially available digitally delivered CBT-I programs for use by young people. The aim of this project was to develop a smartphone app that delivers CBT-I to young people to improve sleep.

Methods

To inform the development of the app, young people (N=21) aged between 12 and 16 years attended one of the 3 focus groups (each with 4-10 participants). These focus groups were conducted at different stages of the development process such that the process could be iterative. Participants were asked the reasons why they might use an app to help them sleep, the kinds of features or functions that they would like to see in such an app, and any concerns they may have in using the app. Data were analyzed using a thematic analysis approach. Of the issues discussed by the participants, the researchers selected themes associated with content, functionality, and accessibility and user experience to examine, as these were most informative for the app design process.

Results

In terms of content, young people were interested in receiving information about recommended sleep guidelines and personalized information for their age group. They reported that keeping a sleep diary was acceptable, but they should be able to complete it flexibly, in their own time. They reported mixed views about the use of the phone’s accelerometer. Young people felt that the functionality of the app should include elements of game playing if they were to remain engaged with the app. Flexibility of use and personalized features were also desirable, and there were mixed views about the schedule of notifications and reminders. Participants reported that for the app to be accessible and usable, it should be from a trusted developer, have engaging aesthetics, have a layout that is easy to navigate, not rely on Internet coverage, and preferably be free. Participants felt that being able to conceal the purpose of the app from peers was an advantage and were willing to provide personal information to use the app if the purpose and use of that information was made clear. Overall, participants endorsed the use of the app for sleep problems among their age group and reported motivation to use it.

Conclusions

The Sleep Ninja is a fully-automated app that delivers CBT-I to young people, incorporating the features and information that young people reported they would expect from this app. A pilot study testing the feasibility, acceptability, and efficacy of the Sleep Ninja is now underway.
Outcomes of Deceased Donor Kidney Offers to Patients at the Top of the Waiting List
Authors: Huml Anne M. , Albert Jeffrey M. , Thornton J. Daryl , Sehgal Ashwini R.
Published: July 2017

Background and objectives

Transplant centers may accept or refuse deceased-donor kidneys that are offered to their patients at the top of the waiting list. We sought to determine the outcomes of deceased-donor kidney offers and their association with characteristics of waitlisted patients and organ donors.

Design, setting, participants, & measurements

We examined all 7 million deceased-donor adult kidney offers in the United States from 2007 to 2012 that led to eventual transplantation. Data were obtained from the national organ allocation system through the United Network of Organ Sharing. The study cohort consisted of 178,625 patients waitlisted for a deceased-donor kidney transplant and 31,230 deceased donors. We evaluated offers made to waitlisted patients and their outcomes (transplantation or specific reason for refusal).

Results

Deceased-donor kidneys were offered a median of seven times before being accepted for transplantation. The most common reasons for refusal of an offer were donor-related factors, e.g., age or organ quality (3.2 million offers, 45.0%), and transplant center bypass, e.g., minimal acceptance criteria not met (3.2 million offers, 44.0%). After adjustment for characteristics of waitlisted patients, organ donors, and transplant centers, male (odds ratio [OR], 0.93; 95% confidence interval [95% CI], 0.91 to 0.95) and Hispanic (OR, 0.96; 95% CI, 0.93 to 0.99) waitlisted patients were less likely to have an offer accepted than female and white patients, respectively. The likelihood of offer acceptance varied greatly across transplant centers (interquartile ratio, 2.28).

Conclusions

Transplant centers frequently refuse deceased-donor kidneys. Such refusals differ by patient and donor characteristics, may contribute to disparities in access to transplantation, and vary greatly across transplant centers.

Podcast

This article contains a podcast at https://www.asn-online.org/media/podcast/CJASN/2017_07_27_Huml.mp3
The effect of peer interaction on sport confidence and achievement goal orientation in youth sport
Authors: Hwang Seunghyun , Machida Moe , Choi Youngjun
Published: July 2017

We used a longitudinal design to examine peer interaction in youth sport as an antecedent of changes in sport confidence and achievement goal orientation (comprising task and ego orientation). At the beginning of the winter playing season, 141 children and adolescents (from 8 to 15
years of age) who were members of soccer clubs in the Midwest of the USA, completed the Sport Confidence Inventory (SCI) and the Task and Ego Orientation in Sport Questionnaire (TEOSQ), and 51 of the original respondent group also completed the SCI, the TEOSQ, and a social network measure
at the end of the playing season. To assess the effect of peer interaction on the young soccer players, we employed the influence model in social network analysis. The results showed that interaction with peers in the same age group positively influenced changes in task goal orientation and
in sport confidence in regard to cognitive efficiency and resilience. In contrast, ego goal orientation was positively affected by interaction with peers in a different age group. The results increase understanding of young people's sport motivation as a function of their peer interaction.
Effect of psychological contract breach on employee voice behavior: Evidence from China
Authors: Guo Yungui
Published: July 2017

I explored the internal influence mechanism of psychological contract breach on employee voice using hierarchical regression analysis and a bootstrap method. Participants were 232 employees from 5 Chinese private corporations. The results indicated that psychological contract breach
was negatively associated with employees' promotive and prohibitive voice. In addition, organizational trust played a completely mediating role in this relationship, and managerial openness moderated the relationship between organizational trust and employees' promotive and prohibitive voice.
The results extend previous findings on psychological contract breach and employee voice behavior and clarify their relationship to some extent.
An Interview with Dr Gail Omvedt
Authors: Gaikwad Baliram N. , Patil Sumeet Ravindra
Published: July 2017

Interview of Dr. Gail Omvedt by Dr. B.N. Gaikwad and Sumeet R. Patil, conducted on 14 March 2016 in the University of Mumbai Campus, Vidyanagri, Santacruz East, Mumbai, Maharashtra, India.DDr Gail Omvedt is an American-born scholar, who has obtained her Ph.D. from the University of California Berkeley in 1973. Dr. Omvedt has devoted her life to Dr Ambedkar’s anti-caste movement, Shramik Mukti Dal, Stri Mukti Sangharsh Chalval, the women’s movement and social work since becoming a citizen of India in 1983. She has also authored several books and published, which helps people associated with Dalit literature and Movement. This interview was conducted during the visit of Dr Omvedt and Dr Bharat Patankar to Vidyanagri, Kalina Campus, Santacruz, Mumbai University on 14 March 2016.
A INTERDISCIPLINARIDADE NA ESCOLA: DIFICULDADES E DESAFIOS NO ENSINO DE CIÊNCIAS E MATEMÁTICA
Authors: Avila Lanúzia Almeida Brum , Matos Diego De Vargas , Thiele Ana Lúcia Purper , Ramos Maurivan Güntzel
Published: July 2017

Este artigo aborda a interdisciplinaridade e as possíveis dificuldades e os desafios identificados na sua implementação nas escolas pelos professores que lecionam diferentes disciplinas do currículo escolar. A pesquisa possui abordagem qualitativa e objetivou responder à seguinte questão: “Quais são as dificuldades e os desafios apontados por professores no desenvolvimento de um ensino com características interdisciplinares na área de Ciências e Matemática?” Participaram da investigação 20 docentes com formação inicial em diferentes cursos de licenciatura, entre eles, Ciências Biológicas, Geografia, Matemática, Pedagogia e Química, todos ingressantes em um curso de pós-graduação na área de Educação em Ciências e Matemática de uma Instituição de Ensino Superior privada do Estado do Rio Grande do Sul, Brasil. A coleta de dados foi feita por meio da escrita de depoimentos pelos participantes da pesquisa como resposta a uma das perguntas de um questionário, a qual indagava sobre as dificuldades e os desafios da interdisciplinaridade na escola. Os depoimentos dos participantes de pesquisa foram tratados por meio da Análise Textual Discursiva - ATD, envolvendo as etapas de unitarização, categorização e construção de metatextos com vistas à descrição e interpretação. Pela análise das unidades de significado, emergiram 13 categorias iniciais, as quais foram reagrupadas em três categorias finais, a saber: dificuldades e desafios associados à fragmentação disciplinar; dificuldades e desafios associados ao diálogo com colegas e gestores; dificuldades e desafios associados aos problemas de interesse e conhecimento. Os resultados mostram que os participantes da pesquisa apontam para a necessidade de serem preenchidas algumas lacunas em sua própria formação docente referentes à interdisciplinaridade e de haver apoio da equipe diretiva das escolas e diálogo entre os professores das diversas disciplinas que compõem o currículo escolar com vistas a superar essas dificuldades e desafios enfrentados ao desenvolver um ensino com características interdisciplinares na área de Ciências e Matemática.
A FORMAÇÃO CONTINUADA E SUAS IMPLICAÇÕES NA COMPREENSÃO DA DISCALCULIA
Authors: Thiele Ana Lúcia Purper , Lara Isabel Cristina Machado
Published: July 2017

O presente artigo aborda a discalculia e as percepções dos professores acerca desse transtorno e das possíveis mudanças dessas percepções após a participação em curso de extensão Universitária sobre a temática: Dificuldades e transtornos de aprendizagem em Matemática: Acalculia e discalculia. A pesquisa tem abordagem qualitativa e pretendeu construir respostas à seguinte questão: “Para você o que é discalculia?” Participaram da investigação 23 sujeitos de pesquisa com formação inicial em diferentes cursos de licenciatura, entre eles, Pedagogia, Matemática, Ciências Biológicas, Educação Especial e Psicologia. A coleta de dados foi feita por meio de um questionário respondido pelos participantes antes do curso e após o curso sobre transtornos de aprendizagem, com o objetivo de analisar as percepções prévias desses professores e o deslocamento dessas percepções após a participação no curso. Os depoimentos dos sujeitos de pesquisa foram tratados por meio da Análise Textual Discursiva (ATD), envolvendo a unitarização, categorização com vistas à descrição e interpretação. Os resultados mostram que antes da formação os professores atribuíam várias denominações e características à discalculia. Após a Formação Docente, essas categorias diminuíram para duas, evidenciando a necessidade que esses professores possuem de obter subsídios teóricos e práticos acerca desse tema. É possível mostrar que as respostas dadas ao pós-questionário convergiram para uma definição mais exata de discalculia, denominando-a como um transtorno ou distúrbio.
OS ESPAÇOS E MATERIAIS COMO ELEMENTOS FAVORECEDORES DA CONSTRUÇÃO DO CONHECIMENTO LÓGICO-MATEMÁTICO NA EDUCAÇÃO INFANTIL
Authors: Lorenzon Mateus , Da Silva Jacqueline Silva
Published: July 2017

Neste estudo, analisa-se de que forma os espaços e materiais favorecem a construção do conhecimento lógico-matemático em crianças de três anos. Os pressupostos teóricos que sustentam o estudo são decorrentes de uma perspectiva construtivista, sendo que propõe-se uma interface com autores que abordam a concepção dos espaços e materiais como um segundo educador. A investigação caracteriza-se como uma pesquisa-ação e foi desenvolvida enquanto docente de uma turma de Maternal de uma Escola Municipal de Educação Infantil, localizada em Lajeado/RS. Para a produção do corpus da pesquisa utilizou-se de Diários de Campo, Filmagens e Fotografia, sendo estes analisados por meio de uma abordagem reflexiva e dispostos em duas categorias. A primeira categoria produzida trata das contribuições do espaço para o desenvolvimento da aprendizagem. Por sua vez, a segunda categoria aborda a importância dos materiais para o brincar simbólico presentes no espaço para o desenvolvimento do conhecimento lógico-matemático.
TALLER DE CREACIÓN LITERARIA PABLO NERUDA, HACIA UN DESARROLLO SOSTENIBLE DEL TALENTO ARTÍSTICO UNIVERSITARIO
Authors: Chacón Zaldivar Carlos
Published: July 2017

La realidad sociocultural que vive el país y el creciente desarrollo cultural que caracteriza a la Atenas de Cuba, exigen al Movimiento de Artistas Aficionados de la Universidad de Matanzas en Cuba, un despliegue armonioso con el aprovechamiento de sus fortalezas académicas y las oportunidades de su entorno para poder influir positivamente hacia adentro y hacia afuera de la comunidad universitaria. Así el movimiento de jóvenes escritores de esta casa de altos estudios busca profundizar su labor creativa y a la vez socializar más sus producciones literarias a partir del proyecto sociocultural Taller de Creación Pablo Neruda.
Penalizacyjna pułapka wadliwej polityki społecznej
Authors: Pospiszyl Kazimierz
Published: July 2017

Autor omawia poglądy badaczy na temat odnotowywanego współcześnie niepokojącego wzrostu liczby osób osadzanych w więzieniach. Przytoczone opinie ukazują w jaki sposób wadliwa i krótkowzroczna polityka społeczna prowadzona w wielu krajach zachodnich, zamiast skupiać się na długofalowych, żmudnych co prawda, ale bardziej skutecznych programach aktywizacji społecznej asymilacji przedstawicieli środowisk upośledzonych pod względem ekonomicznym, skupia się na doraźnych, głownie populistycznych zabiegach. Na zakończenie przedstawia opublikowane niedawno poglądy P.K. Ennsa o immanentnych związkach wskaźników inkarceracji z kształtowanymi przez media nastrojami społeczeństwa amerykańskiego.
Rewiktymizacja ofiar wykorzystywanych seksualnie przez kobiety
Authors: Kowalczyk Małgorzata H.
Published: July 2017

Ofiary doświadczające wykorzystywania seksualnego przeżywają nie tylko fizyczną krzywdę ale przede wszystkim doznają głębokich urazów psychicznych, które bardzo często w różnych formach towarzyszą im przez całe życie. Dość często przy ustalaniu następstwbagatelizuje się płeć sprawcy. Dlatego bardzo ważne jest poznanie problemu nadużyć seksualnych z perspektywy bliskich i odległych następstw w przypadku, gdy sprawczynią tych czynów była kobieta – matka, opiekunka. W artykule, wykorzystując metodę przeszukiwania źródeł wtórnych, przedstawiono problem następstw seksualnego wykorzystywania u ofiar, które zachowań tych doświadczyły ze strony kobiet. Celem opracowania jest omówienie specyfiki przeżywanej przez ofiary obojga płci traumy powiązanej z wykorzystaniem seksualnym a także bliskich i odległych konsekwencji tych wydarzeń w postaci wiktymizacji pierwotnej oraz rewiktymizacji zaznaczającej się w dorosłym życiu w postaci zaburzeń psychoseksualnych i deficytów społecznych. Wśród konsekwencji na szczególną uwagę zasługują wyodrębnione czynniki traumatyczne o charakterze dynamicznym, które wywołują pojawienie się wielu symptomów charakterystycznych dla dzieci, które doświadczyły przemocy seksualnej. Wspomniane czynniki to: traumatyczna seksualizacja dziecka, zdrada, stygmatyzacja oraz bezsilność. Specyfika tych czynników wynika z faktu, że pozostawiają one odległe „ślady” w psychice i mogą ulec dodatkowemu wzmocnieniu w sytuacji, gdy sprawcą przemocy seksualnej jest kobieta. Wynika to z częstych postaw „zaprzeczania” wobec przemocy seksualnej stosowanej przez kobiety.W opracowaniu wskazano także na jedną z możliwych konsekwencji procesu rewiktymizacji jaką jest powielanie przez ofiary w ich późniejszym życiu wzorów zachowań powiązanych z seksualnym wykorzystywaniem dzieci. Proces ten wynikający z naprzemiennej identyfikacji sprawczyni i ofiary uruchamia mechanizm błędnego koła, który utrudnia tworzenie prawidłowych interakcji społecznych.