bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multi-Timescale Workflow for Optimizing Installation and Integrity of Extended-Reach Horizontal Liners
Authors: Taubner Spencer , Van Vliet John , Dall'Acqua Dan 
Published: October 2017

Abstract
Liner designs for extended-reach horizontal wells should include a unified approach to mechanical integrity that considers all stages of the well life, beginning with the well design and tubular selection process and extending to well construction, operation, and decommissioning. Digital oilfield technologies present considerable opportunities for optimizing liner installation and integrity, particularly through simulation, measurement, analysis, and prediction of running loads during well construction.
This paper presents a multi-timescale workflow for optimizing liner installation and integrity in extended-reach horizontal wells. Given accurate models and planned well trajectories, liner installations can be simulated, problem depths identified, and mitigation plans put in place weeks to months before running liner. Since actual field running conditions rarely match design assumptions and predictions, it is beneficial to monitor and respond to installation loads in real time during the liner run. Furthermore, in a multi-well development, plans can be refined in the days between liner runs based on recent experience. Finally, on the order of months to years, well designs can be optimized based on field experience to meet both installation and operational needs.
Design-time simulation, live monitoring and predictions, inter-well tuning, and long-term design optimization make a powerful combination. Damage to downhole components or excessive drag on the running string can be predicted and prevented. Capital costs and construction costs can be reduced substantially without incurring additional risk or compromising well performance. Integration of well construction loading can enable tailored operating strategies that account for well-specific construction issues.
The workflow presented in this paper is novel in its breadth, spanning timescales from seconds out to years, and in its incorporation of new technologies for measuring and analyzing well construction data. Many elements of the workflow can be implemented independently to provide incremental gains and continuous improvement.
Flow Control Devices for SAGD Applications: Lessons Learned, Best Practices, and Suggested Design Improvements
Authors: Park Sang-Yeop , Saks Delon , Laksmanan Venki , Singh Anthony , Ma Michael 
Published: October 2017

Abstract
An inflow control device (ICD) incorporates either a restrictive or a tortuous flow path to impose an artificial pressure drop across the device. ICDs can offer a solution to the imbalance in heat transfer often seen along the wellbore and promote better conformance in steam chamber growth because they are able to re-distribute energy more evenly during steam-assisted gravity drainage (SAGD) operations. ICDs can be applied in conventional and unconventional resources, but the main focus of this paper is unconventional applications, specifically bitumen production by SAGD. An outcome of efforts in 2008, the ICD’s first application was to mitigate flow conformance issues that were seen along the producer and injector wells; these issues were caused by various geologic and operational factors as well as backflow effects. The effectiveness of that first application has been well recognized in the form of higher bitumen production with better energy efficiency (Stalder, 2012). The conceived benefits of ICDs extend beyond production increases. One of the leading operators in the Athabasca oil deposits, who adopted ICDs in the early stage of their SAGD wells, confirmed ICD applications enabled them to produce bitumen even during the start-up circulation period and to realize a production increase of up to 80% at conversion to SAGD (Morgan, 2016). As more ICD success stories have circulated within the industry, SAGD operators’ interest in ICDs has grown steadily. On the basis of reviews of historical ICD performance, this paper provides lessons learned and suggested design improvements that will hopefully lead to more efficient ICD configurations in SAGD operations.
The Development & Field Results of a New, Advanced form of Sodium Silicate as a Cost Effective Solution for Treatment for Sustained Casing Pressure
Authors: McDonald Michael , Li Xianglian 
Published: October 2017

Abstract
Often, gas travels through microfractures and channels and requires the use of a solids-free chemical to adequately fill and block gas pathways. Recent years have shown sodium silicate as an effective and environmentally friendly treatment option. With lower oil prices and increasing regulatory requirements there is a greater need to improve treatment performance and reduce costs in the treatment of surface casing vent flows and gas migration. Recognizing these needs, the chemistry of conventional sodium silicate was modified to allow for a broader range of application and provide improved physical properties upon setting.
Conventional manufacturing methods produce aqueous sodium silicate with a defined range of molecular size, shape and charge. An alternative production method was developed that reduces the alkalinity and increases the silica ratio and is described as a high-ratio sodium silicate. The form and distribution of silica in solution is quite different than commercially available sodium silicate. The silicate molecules in solution are significantly larger and with a lower charge density. The change in silica structure positively impacts the setting of sodium silicate by polymerization and precipitation. Several of the commonly used setting agents used with sodium silicate and/or colloidal silica were investigated with the high-ratio sodium silicate. Compared to conventional silicates, the high-ratio silicate could achieve longer set times and was less prone to variations in setting agent concentration. Upon setting, the high-ratio sodium silicate showed excellent dimensional stability with significantly less setting agent requirement vs. conventional silicates.
Initial field trials took place in Western Canada using two distinct placement techniques. The first approach was to squeeze the high-ratio silicate into microchannels as a standalone product. The second approach was as a compliment to a cement squeeze. Field results ranged from complete zonal isolation to reduced levels of gas migration. Where gas migration was not completely eliminated, data suggested that not all pathways were squeezed and/or there were secondary sources of gas. On-going field trials will allow for improvements and comparisons of placement techniques.
Estimating Genotype × Environment Interaction for and Genetic Correlations among Drought Tolerance Traits in Maize via Factor Analytic Multiplicative Mixed Models
Authors: Dias Kaio Olímpio Das Graças , Gezan Salvador Alejandro , Guimarães Claudia Teixeira , Parentoni Sidney Netto , Guimarães Paulo Evaristo de Oliveira , Carneiro Newton Portilho , Portugal Arley Figueiredo , Bastos Edson Alves , Cardoso Milton José , Anoni Carina de Oliveira , de Magalhães Jurandir Vieira , de Souza João Cândido , Guimarães Lauro José Moreira , Pastina Maria Marta 
Published: October 2017

ABSTRACTWater deficit is one of the most common causes of severe crop‐production losses worldwide in maize (Zea mays L.). The main goal of this study was to infer about genotype × environment interaction (G × E) and to estimate genetic correlations between drought tolerance traits in maize using factor analytic (FA) multiplicative mixed models in the context of multi‐environment trial (MET) and multi‐trait multi‐environment trial (MTMET) analyses. The traits measured were: grain yield (GY), ears per plot (EPP), anthesis‐silking interval (ASI), female flowering time (FFT), and male flowering time (MFT). Three‐hundred and eight hybrids were evaluated in a total of eight trials conducted under water‐stressed (WS) and well‐watered (WW) conditions across 2 yr and two locations in Brazil. For most of the traits (GY, ASI, and FFT), the magnitude of the genetic variances differed across WS and WW conditions. Genetic correlations between water conditions for FFT and MFT were 0.81 and 0.82, respectively, indicating that it might be unnecessary to measure these traits in both water conditions. Grain yield and EPP showed moderate to high G × E, with genetic correlations of 0.57 and 0.39 between WS and WW conditions, respectively, which suggested that gene expression was not consistent across different water regimes. Therefore, it is necessary to evaluate these traits under both water conditions. Genetic correlations between pairs of traits, in general, were higher under WS conditions compared with WW conditions. Grain yield exhibited moderate correlations with EPP (r = 0.62) and FFT (r = −0.42) under WS conditions. The FA models can be a useful tool for MET and MTMET analyses in maize breeding programs for drought tolerance.
Responses of Cotton at Different Growth Stages to Aeration Stress under the Influence of High Temperature
Authors: Qian Long , Wang Xiugui , Luo Yunying , Sun Huaiwei , Luo Wenbing 
Published: October 2017

ABSTRACTIn the middle reach of the Yangtze River Plain, cotton (Gossypium hirsutum. L) can experience aeration stress at multiple growth stages, often accompanied by high temperature. These two stresses can negatively affect growth and yield. This study aimed to investigate the responses of cotton at different growth stages to aeration stress, particularly under high temperature. Two field experiments examining cotton responses to aeration stress were conducted over 8 yr, and structural equation modeling was performed to reveal the relationships among aeration stress, high temperature, and the growth and yield of cotton at four growth stages. The interannual variability in the yield‐reducing effect of aeration stress was closely associated with high temperature. Aeration stress and high temperature both interactively (in Experiment 1) and independently (in Experiment 2) reduced seed cotton yield. The interaction between these two stresses was observed only in Experiment 1, in which the impact of aeration stress was relatively slight. In Experiment 1, the growth stage most sensitive to aeration stress changed with high temperature. In both experiments, under high temperature, the sensitivity of seed cotton yield to aeration stress was threefold higher at the flowering and boll‐filling stage than at the other stages. In conclusion, the responses of cotton to aeration stress depend on the time at which aeration stress occurs and the additional impact, if any, of high temperature.
Major Management Factors Determining Spring and Winter Canola Yield in North America
Authors: Assefa Yared , Prasad P. V. Vara , Foster Chris , Wright Yancy , Young Steven , Bradley Pauley , Stamm Michael , Ciampitti Ignacio A. 
Published: October 2017

ABSTRACTCanola (Brassica napus L. cv. ‘Canola’) production has both economic and agronomic advantages. The objectives of this review were to summarize the key management factors determining crop productivity and to propose plausible pathways to narrow the gap between actual and potential yield. A synthesis study was conducted on data available from performance trials and by reviewing >100 reports in peer‐reviewed journals, extension publications, and websites. The main outcomes obtained from this synthesis suggested that canola attainable yield could be 4 Mg ha−1 with a potential maximum yield of 7 Mg ha−1. However, actual average yields in North America region were ∼1.7 Mg ha−1 for the period 2000 to 2014. Available in‐season water, water distribution at critical stages, and nutrient supply (soil plus fertilizer) all contribute to a significant portion of canola yield. Other management factors such as seeding rate, rotation, and cultivar selection substantially affect plant performance. Tillage might have an economic and environmental effect, but overall, the outcome of the meta‐analysis did not show significant effect on yield. The review suggests that water supply, balanced nutrition, early planting (for both winter and spring types) in shallow depth (10–19 mm), high seeding rate (6 kg ha−1), and diverse rotation (canola every 3 or 4 yr) are among the best management practices to increase yields. Future lines of research should focus on improving planting operations that diminish early‐season heterogeneity, fine‐tuning optimal seeding rates based on modern varieties at varying yield environments, and searching for compatible hybrids to replant without heterogeneity at harvest.
Minimum Daily Respiration of Maize: Relationship to Total Daily Respiratory Carbon Loss, and Effects of Growth Stage and Temperature
Authors: Di Matteo J. A. , Goldenhar K. E. , Earl H. J. 
Published: October 2017

ABSTRACTSince crop respiration can only be measured in darkness, estimating total daily crop respiration (Rt) requires knowledge of the quantitative relationship between daytime and nighttime respiration, including the predicted effect of temperature. We measured minimum daily (early morning) respiration (Rmin) in maize (Zea maysL.) at four different temperatures during the night and at four different growth stages to estimate the respiration response to temperature. In a field experiment, respiration was measured every 2 to 5 h over a 24‐h period at five different growth stages to explore the relationship betweenRtandRmin. The fractional rate change with 10°C temperature increment (Q10) decreased as the temperature increased. A single function was proposed to describe the respiration response to temperature across all growth stages. The minimum respiration of the day was reached between midnight and 6:00 AM, andRminrepresented 89 to 57% ofRt. Modeling maize respiration assuming a constantQ10is inadvisable, sinceQ10varies with temperature. There was no effect of growth stage onQ10until 26°C; above this temperature, respiration increased only in older plants. TheRtincreased over the season as biomass accumulated, but the ratio ofRmin/Rtreached its highest value at silking.
TCAP FAC‐WIN6 Elite Barley GWAS Panel QTL. II. Malting Quality QTL in Elite North American Facultative and Winter Six‐Rowed Barley Identified via GWAS
Authors: Belcher Araby R. , Cuesta‐Marcos Alfonso , Smith Kevin P. , Hayes Patrick M. 
Published: October 2017

ABSTRACTMalt barley (Hordeum vulgare L.) is an economically important crop worldwide. Barley malting quality is difficult to breed for, as it is a combination of complex traits that are time consuming and expensive to phenotype. This makes marker‐assisted selection—and thus quantitative trait locus (QTL) mapping—particularly appealing. We used the Oregon State University and University of Minnesota facultative and winter six‐rowed barley advanced breeding lines to assemble a genomewide association studies (GWAS) panel, named the FAC‐WIN6, to map malting quality QTL within our breeding programs. Winter and facultative malt barleys can be sown in fall, which makes them more sustainable in terms of soil erosion and input efficiency. The FAC‐WIN6 projects are part of the Triticeae Coordinated Agricultural Project, which aims to develop sustainable barley and wheat (Triticum aestivum L.) germplasm that is robust to climate change. The FAC‐WIN6 has 300 lines, with genotypic data for 5812 polymorphic single‐nucleotide polymorphism markers. We conducted a 2‐yr, single‐location GWAS experiment for eight malting quality traits: plump grain, grain protein, and six modification traits. We report 20 malting quality QTL across seven traits. Eight of the QTL appear to be novel. For each QTL, we provide an effect estimate, a representative marker, and a candidate gene. Our results are useful for marker‐assisted selection, as well as for strengthening the confidence on several QTL mapped in other barley germplasm.
TCAP FAC‐WIN6 Elite Barley GWAS Panel QTL. I. Barley Stripe Rust Resistance QTL in Facultative and Winter Six‐Rowed Malt Barley Breeding Programs Identified via GWAS
Authors: Belcher Araby R. , Cuesta‐Marcos Alfonso , Smith Kevin P. , Mundt Christopher C. , Chen Xianming , Hayes Patrick M. 
Published: October 2017

ABSTRACTThe fungal disease barley stripe rust (BSR, causal agent Puccinia striiformis f. sp. hordei) can greatly reduce yield and quality of malt barley (Hordeum vulgare L.), a valuable crop in the distilling and brewing industries. Yield losses of up to 70% have been reported. Resistant cultivars are the most sustainable defense against BSR, especially those cultivars with pyramids of quantitative disease resistance (QDR) genes. The Oregon State University (OSU) barley breeding program has selected for BSR resistance for decades and has released cultivars with BSR resistance. We wanted to determine the number and effect of the loci underlying that resistance, as well as whether it was conferred by QDR or race‐specific qualitative loci. To test these, we used BSR resistance quantitative trait loci (QTL) mapping via genomewide association studies (GWAS) in adult‐plant field trials (3 yr, one location) and race‐specific seedling greenhouse trials (five races). The FAC‐WIN6, a GWAS panel composed of 300 lines that represent the OSU and University of Minnesota facultative and winter six‐rowed malt barley breeding programs, was used in genotyping and phenotyping. The FAC‐WIN6 was developed as part of the USDA‐ARS Triticeae Coordinated Agricultural Project but was not developed specifically for BSR resistance. In total, we detected three race‐specific QTL in greenhouse trials (one of which was also significant in field trials) and 14 QTL significant in field trials only with 2.3 to 20.7% additive reduction in percentage disease severity. At least five QTL were considered novel. These results indicated that the OSU breeding program had both QDR and race‐specific loci for BSR resistance. We suspected that its BSR resistance distributions in the FAC‐WIN6 might align with the major population structure patterns in ways that would be difficult to account for with a GWAS model alone. Therefore, based on post hoc diagnostics, we report a qualitative “usability” level for each QTL.
A Robust Mobile Robot Navigation System using Neuro-Fuzzy Kalman Filtering and Optimal Fusion of Behavior-based Fuzzy Controllers
Authors: Nguyen Thi Thanh Van , Le Ha Vu , Tran Quang Vinh 
Published: October 2017

This study proposes a control system model for mobile robots navigating in unknown environments. The proposed model includes a neuro-fuzzy Extended Kalman Filter for localization task and a behaviorbased fuzzy multi-controller navigation module. The neuro-fuzzy EKF, used for estimating the robot’s position from sensor readings, is an enhanced EKF whose noise covariance matrix is progressively adjusted by a fuzzy neural network. The navigation module features a series of independently-executed fuzzy controllers, each deals with a specific navigation sub-task, or behavior, and a multi-objective optimizer to coordinate all behaviors. The membership functions of all fuzzy controllers play the roles of objective functions for the optimizer, which produces an overall Pareto-optimal control signal to drive the robot. A number of simulations and real-world experiments were conducted to evaluate the performance of this model.
Harapan, Tawakal, dan Stres Akademik
Authors: Husnar Anni Zulfiani , Saniah Siti , Nashori Fuad 
Published: October 2017

<p class="IABSTRAK"><strong>Abstract</strong>: This study aimed to find out the effect of hope and tawakal toward academic stress among undergraduate students. This study used quantitative method with 102 under­graduate students from Islamic college as subjects of this research. Data were collected through three reliable and valid scales; Hope Scale, Tawakal Scale, and Academic Stress Scale. The result of data using multiple regression analysis showed a negative effect of hope and tawakal together toward academic stress among undergraduate students.</p><p><strong>Abstrak:</strong> Penelitian ini bertujuan untuk melihat pengaruh harapan dan tawakal terhadap stres akademik pada mahasiswa. Penelitian ini menggunakan metode kuantitatif dengan subjek sebanyak 102 mahasiswa S1 di salah satu perguruan tinggi Islam di D.I. Yogyakarta yang ditentukan dengan teknik <em>accicedental sampling.</em> Data dikumpulkan melalui pemberian tiga skala kepada masing-masing subjek, yaitu Skala Harapan, Skala Tawakal, dan Skala Stres Akademik yang reliabel dan valid. Hasil analisis data menggunakan regresi berganda menunjukkan adanya pengaruh negatif dari harapan dan tawakal secara bersama-sama terhadap stres akademik pada mahasiswa. </p><p align="center"><strong><em> </em></strong></p>
Regimen Switching After Initial Haart By Race in a Military Cohort
Authors: Schofield Christina , Wang Xun , Monahan Patrick , Chu Xiuping , Glancey Margaret , Ganesan Anuradha , Okulicz Jason F. , Agan Brian K. 
Published: October 2017

Background:
Prior studies have suggested that HAART switching may vary by ethnicity, but these associations may be confounded by socioeconomic differences between ethnic groups. Utilizing the U.S. military healthcare system, which minimizes many socioeconomic confounders, we analyzed whether HAART switching varies by race/ethnicity.

Methods:
HAART-naïve participants in the U.S. Military HIV Natural History Study who initiated HAART between 1996-2012 and had at least 12-months of follow-up were assessed for factors associated with HAART regimen change (e.g. NNRTI to PI) within one year of initiation. Multiple logistic regression was used to compare those who switched versus those who did not switch regimens.

Results:
2457 participants were evaluated; 91.4% male, 42.3% Caucasian, 42.8% African-American, and 9% Hispanic. In a multivariate analysis, African-Americans had lower odds (OR 0.76, 95% CI 0.65, 0.98) while Hispanics had no significant difference with respect to HAART switching compared to Caucasians; however, Other race was noted to have higher odds (OR 1.77, 95% CI 1.11, 2.83). Additional significantly associated factors included CD4 <200 cells/uL at HAART initiation, higher viral load, prior ARV use, and history of depression.

Conclusion:
In this cohort with open access to healthcare, African-American and Hispanic races were not associated with increased odds of switching HAART regimen at 12 months, but Other race was. The lack of association between race/ethnicity and regimen change suggest that associations previously demonstrated in the literature may be due to socioeconomic or other confounders which are minimized in the military setting.
Arquitectura veraz: 90 edificios de apartamentos en la Ciudad de México 1948-1981. Entrevista al ingeniero Boris Albin Subkis
Authors: Leal Menegus Alejandro 
Published: October 2017

Boris Albin fue un prolífico diseñador, constructor e ingeniero de origen ucraniano en el seno de una familia judía, que emigró a México en la década de 1930 y egresado de la entonces Escuela de Ingeniería de la Universidad Nacional Autónoma de México, tuvo en su haber más de 330 obras entre edificios de apartamentos, escuelas, fábricas, oficinas, templos e infraestructura. Es de particular relevancia su aportación e materia de vivienda plurifamiliar, no sólo por la cantidad sino por la calidad de su obra. Poco se conoce sobre él, sus orígenes, su forma de trabajar y su visión de la arquitec-tura que tanto impactó el desarrollo de la Ciudad de México.