bluuebunny/crossref_metadata_2025_split huggingface dataset:
Impact of heat and moisture stress on crop productivity: Evidence from the Langgewens Research Farm
Authors: Conradie Beatrice , Piesse Jenifer , Strauss Johann 
Published: September 2021

We investigated the effect of heat and moisture stress on total factor productivity in crop farming under experimental farm conditions. Heat stress is the number of days during the growing season during which the maximum temperature exceeds 24.9 °C. Total rainfall is treated as a basic factor of production and periodic moisture stress, or lack thereof, is the number of rainfall days during the growing season. All models controlled for the cumulative soil benefits arising from minimum tillage, which is the main objective of the experiment. Model specification was evaluated using likelihood ratio tests and three are worthy of note. The study site received 329 mm of rainfall on average on 22 rainy days per season during the period 2002–2015, while the maximum temperature typically rose above 24.9 °C on 33 days per growing season. The average efficiency of the plots in the long-term crop rotation experiment increased at 3.4% per year from a base of 60% to the most recent level of 78%. Neither heat nor moisture stress changed significantly over the study period. Heat stress was found to reduce efficiency by 1.75% per hot day and rainfall increased efficiency by 1.45% for each additional rainy day. However, the interaction of heat and moisture stress lowered productivity overall.Significance:

This study contributes a new approach to modelling the effect of climate on agricultural productivity using a new metric of heat and moisture stress.
We quantify the marginal effects of rising temperatures and rainfall events and evaluate several potential specifications of heat and moisture stress variables.
Impact of a Bisphosphonate Drug Holiday on the Bone Mineral Density in Patients with Osteoporosis
Authors: Rutendo Rukarwa , Farzahna Mohamed , Frederick Raal 
Published: September 2021

ABSTRACT

Background: Bisphosphonate therapy has proven efficacy in the management of osteoporosis. Unlike other therapies, bisphosphonates are unique in that they continue inhibiting bone resorption after a discontinuation of therapy. Rare adverse effects related to its prolonged use, specifically osteonecrosis of the jaw and atypical femur fractures, resulted in the concept of a “drug holiday” (DH).

Objective: To evaluate the effect of a bisphosphonate DH on bone mineral density (BMD) in the treatment of osteoporosis with zoledronic acid and/or alendronate.

Methods: A single-centre retrospective cohort study of 97 patients with osteoporosis who had received bisphosphonate therapy and undertaken a DH between 2000 and 2016 was conducted at a large public academic hospital in Johannesburg, South Africa.

Results: A total of 97 patients were included in the study. The median age at the initiation of bisphosphonate therapy was 63 years. The median duration of treatment before the DH was 5 years with the median duration of the DH being 2 years. The overall effect of the DH on BMD assessed as the percentage change from the beginning to the end of the DH showed a decrease in BMD lumbar spine [−3.3%, P = 0.398], radius and ulnar [−16.7%, P = 0.03] and total hip [−8.9%, P = 0.001]. Four patients (4.1%) sustained fractures during the DH.

Conclusion: A DH should be cautiously considered with the long-term use of bisphosphonates. An individualised approach based on risk factor assessment, fracture risk, and BMD is key in assessing the duration of the DH, and only low-risk patients should be considered.
Plant Growth Ameliorating and Rhizosphere Competent Native Acinetobacter pittii Strain F2 5 from the Rhizosphere of Zea mays L.
Authors: Josephine C.M. Reena , Thomas Jibu 
Published: September 2021

Background: Acinetobacter is an aerobic gram negative, non-spore forming, oxidase negative, catalase positive, non-motile encapsulated coccobacilli. They are ubiquitous in nature mostly isolated from soil, water, food, sewage, animal and human skin, marine water and rhizosphere of maize and wheat. The present study was focused on isolation and characterization of a native strain of rhizospheric Acinetobacter for plant growth promoting ability through different microbiological and morphometric parameters under greenhouse conditions. Methods: Rhizosphere soil samples were collected from maize fields and processed as per the standard microbiological procedure. The morphology was reconfirmed through scanning electron microscopy. DNA extraction was performed by using al. Two sets of primers (universal and specific for H. pylori) were used to amplify the 16S ribosomal gene. Sanger sequencing was applied and the resulted sequences were matched with the sequences of the National Center for Biotechnology Information (NCBI) nucleotide database. The evolutionary aspects were analyzed using MEGA7 software. Result: The strain exhibited plant growth promoting attributes of ammonia generation, inorganic and organic phosphate solubilization 1-aminocyclopropane-1-carboxylate deaminase activity. The strain was identified as Acinetobacter pittii through 16S rRNA sequencing and was designated as Acinetobacter pittii strain F2 5 with the accession number KM677194. Scanning electron microscopy was carried out to reconfirm the morphology of the strain. Under laboratory and green house conditions the strain improved the shoot and root length and its biomass of the treated maize seedlings as compared to the uninoculated control underscoring the plant growth potential of these strains in sustainable agricultural practices.
Barriers and drivers towards eco-innovation for SMEs: Evidence from the context
Authors: Brogi Stefano , Menichini Tamara 
Published: September 2021

Eco-innovations have become a clear target of EU policy strategies. Consequently, measuring eco-innovation performance at the country level has become crucial to detect eco-innovation patterns and to design eco-innovation policy implementation. This paper focuses on EU small and medium enterprises (SMEs) with the aim to understand to what extent EU funding programmes influence barriers and drivers towards SMEs’ eco-innovation performance. A correlation analysis between data from Eco-Innovation Scoreboard index and competitiveness and innovation framework programme/Entrepreneurship and innovation programme/Eco-innovation programme projects database reveals that the countries with the highest number of EU funded projects are those with the lowest levels of green early-stage investments. According to the findings, EU funding programmes reduce financial constraints that SMEs face for developing eco-innovations. This paper recommends that policymakers should keep in mind the dynamic interaction between private and public funding support, the latter is customised according to the entity of risk along the innovation cycle.

Keywords: Eco-innovation, barriers, drivers, policy strategies, index.
DETERMINANTS OF PARENT’S DECISIONS IN IMMUNIZING MEASLES RUBELLA (MR) VACCINE
Authors: Arista Devi Maya , Puspitasari Dwiyanti , Utami Sri 
Published: September 2021

AbstractBackground: The government’s effort to reduce measles and rubella transmission are by increasing MR immunization coverage. The immunization coverage was influenced by parent’s decisions. There were factors that related with parent’s decisions such as knowledge, perceived susceptibility, seriousness, benefit, barrier, self-efficacy, and cues to action. This study aimed to analyze factors related with parent’s decisions in giving MR immunization. Methods: This was a cross sectional study using questionnaire among parents of children aged 10-30 months at working area of Kenjeran public health center, Surabaya. Data of knowledge, perceived susceptibility, seriousness, benefit, barrier, self-efficacy, and cues to action regarding MR immunization then analyzed using chi-square and logistic regression. Result: From 206 parents, 56.3% were giving MR immunization to their children. Parent’s knowledge (p=0.023; OR=18.08), perceived barrier (p=0.002; OR=46.79), and self-efficacy (p=0.033; OR=7.66) were related with parent’s decisions. Conclusion: Parent’s decisions in giving MR immunization was related with knowledge, perceived barrier, and self-efficacy.
The Importance of Family Support in Successful Treatment Adherence of Schizophrenic Patient
Authors: Jessica Lia , Fithriyah Izzatul , Ardani I Gusti Ayu Indah 
Published: September 2021

Background: Schizophrenia is a treatable disease but requires patient’s high adherence to treatment. Family support of a schizophrenic patient plays an important role in encouraging the patient to continue his treatment. This report aims to enhance the importance of family support of schizophrenic patient in patient’s adherence to achieve a good mental health for all family member.Case: A hospitalized male paranoid schizophrenic patient who was admitted and observed in Dr. Soetomo General Hospital from September 15th-25th, 2020. Patient came to the hospital with chief complaint could not stop talking (rambling) since 1 day before admission. Patient could neither eat nor sleep for that day. Patient relapsed after stopping taking medication from the psychiatrist.Discussions: The patient in this case suffered a relapse of his paranoid schizophrenia because he stopped taking medication. Lack of support from family is the most important factor in a schizophrenia patient. Psychoeducation to patient’s family about schizophrenia and the importance of medication would be a great help for patient’s adherence to treatment.Conclusions: Schizophrenia needs a long-life treatment. High adherence to treatment could improve schizophrenia’s symptoms and prevent relapse. Family support is important to make sure the patient keeps taking his medicine regularly.
Using ESP Permanent Magnet Motor Technology in High-Temperature Geothermal Applications
Authors: Lykova Natalia , Martiushev Danila 
Published: September 2021

Abstract
Geothermal energy is one of the more efficient renewable energy sources. It uses heat from the Earth's interior to produce electricity in geothermal power plants. In binary cycle power plants, geothermal water can often be produced naturally from high-pressure wells. But when reservoir pressure drops, these power plants need to add artificial lift to continue to produce needed quantities of hot water. The geothermal industry is looking at electrical submersible pumping (ESP) systems as a way to improve geothermal fluid production. But ESPs were designed for the conditions in oil wells and are subject to severe complicating factors in geothermal conditions that significantly reduce runlife, such as temperatures up to 200°C (390°F), highly corrosive fluid, and salt deposition (scale). At the same time, production rates need to be higher than those typical of oil production.
The most commonly used geothermal pumps are driven by a transmission shaft and drive on the surface, or they use a submersible asynchronous induction motor. Surface-driven pumps, commonly called line-shaft pumps, have significant depth limitations. Submersible asynchronous induction motors cannot provide a sufficient volume of fluid supply and tend to overheat in high-temperature conditions. To compensate for the heat, induction motors must operate underloaded. Even so, they are subject to frequent premature failures with operating times of between 30 and 100 days. To solve the problem of cost-effective exploitation of geothermal fields, Novomet used its expertise with permanent magnet motors and high-speed pumps to develop an electrical submersible pumping system that would offer more reliability and runlife in geothermal conditions.
A 254-mm (10-in.) geothermal submersible pumping (GSP) system was designed, manufactured, and tested with a production output of up to 12,000 m3/d (75,477 bbl/d, 139 l/s, 2201 gpm,). It featured new generation, high-efficiency pump stages and a permanent magnet motor with a capacity of up to 1.5 MW. The GSP system design was field tested in Turkey. Improvements to early system designs include the use of a heat-conducting filler in the materials used to compound the permanent magnet motor, the adoption of various high-temperature-rated components (AFLAS rubber elements, RYTON motor terminals, and heat-resistant motor oil), and the development of metal-to-metal sealing in the motor lead extension.
One of the early GSP systems installed in the field performed reliably for 470 days at a frequency of 90 Hz, significantly exceeding the target runtime. More than thirty units with a total flow rate of 190,000 m3/d (1,195,000 bbl/d, 2199 l/s, 34,856 gpm) are currently in operation in Turkey. The electrical consumption savings average 25% for each GSP system with a permanent magnet motor compared to systems using asynchronous induction motors.
While designed for geothermal applications, GSPs can also be used in oil and gas operations.
Permanent Magnet Motor Safety
Authors: Nicholson Barry , Yicon Carlos , Harris Dennis , Delaloye Richard 
Published: September 2021

Abstract
As Permanent Magnet Motors (PMMs) become more widely used because of their many benefits, awareness of the potential safety hazards arising from their differences from Induction Motors (IMs) is important. Due to their construction, the magnetic field presence is always "on" with PMM – even when not under energized electrical energy. PMMs are AC generators when freely rotating forward or backward. Elevated safety consciousness is needed to avoid serious injury or fatality when working with PMMs. This paper presents operational procedures for installing, pulling, troubleshooting, and handling PMMs with a focus upon safety. Hazards have been identified, and some mitigations are recommended to eliminate the potential danger and bring awareness to the petroleum industry (and others) to ensure that all workers go home safely. The observations presented in this paper came directly from field experience with operators, equipment manufacturers, and service providers.
Lessons Learned from Analyzing the Runlife Statistics of ESPs Using Kaplan Meier Analysis for North American Unconventional Plays
Authors: Bryan Chris , Nasir Ehsaan 
Published: September 2021

Abstract
Evaluating Electrical Submersible Pumps (ESPs) [SS1] [NA2] run-lives and performance in unconventional well environments is challenging due to many different factors -including the reservoir, well design, and production fluids. Moreover, reviewing the run-lives of ESPs in a field can be rather complex since the run-life data is incomplete. Often ESPs are pulled while they are still operational, or the ESP has not been allowed to run until failure. These are some of the complications that arise when gauging ESP performance.
A large dataset of ESP installs was assessed using Kaplan-Meier survival analysis for the North American unconventional application to better understand those factors that may affect ESP run lives. The factors were studied including but are not limited to the following:
Basin and producing formation Comparing different ESP component types such pumps and motors, and new or used ESP components Completion intensity of the frac job (lb/ft of proppant)
Kaplan-Meier survival analysis is one of the commonly used methods to measure the fraction or probability of group survival after certain time periods because it accounts for incomplete observations. Using Kaplan-Meier analysis generates a survival curve to show a declining fraction of surviving ESPs over time. Survival curves can be compared by segmenting the runlife data into buckets (based on different factors), therefore to analyze the statistical significance of each and how they affect ESP survivability.
Kaplan-Meier analysis was performed on the aforementioned dataset to answer these questions in order to better understand the factors that affect ESP runlives in North American unconventional plays.
This work uses a unique dataset that encompasses several different ESP designs, with the ESPs installed in different North American plays. The observations and conclusions drawn from it, by applying survival analysis, can help in benchmarking ESP runtimes and identifying what works in terms of prolonging ESP runlife. The workflow is also applicable to any asset in order to better understand the drivers behind ESP runlife performance.
An Overview of Surmont SAGD ESP Gas Handling Project to Mitigate Production Effects of NCG Co-Injection
Authors: Nespor Kristian , Walters Roger , Goulet Curtis , Coates Bryan , Studer Daine 
Published: September 2021

Abstract
NCG (Non-Condensable Gas) co-injection with steam has been in operation at Surmont SAGD field since 2017. After a significant number of operational attempts to mitigate ESP no flow events (deadheading) suspected to be instigated by increased production of gas (typical SAGD GOR 5-10 m3/m3) a strategy was developed to focus on completion adjustments to the ESP on candidate SAGD producers. These changes were completed in late 2019 to help reduce the loss of production, which could impact viability of NCG co-injection at Surmont. Three separate completion adjustments were made: an inverted shroud installation, a larger OD pump with a gas separator, and lowering of an ESP to the lowest possible TVD.
A comparison of the production and operational performance before and after each completion adjustment was completed. In-depth design reviews between CPC and the equipment vendor were done to ensure maximum chance of positive benefit. The inverted shroud installation was expected to improve gas separation efficiency, leading to a reduction in the frequency of No Flow Events (NFEs), which were impacting production rates. The shrouded ESP performance on the first candidate well showed no NFEs with a significant increase in production rates compared to the baseline before the completion adjustment. The larger OD pump with gas separator install was also expected to reduce or completely prevent NFEs. the results were also positive, with an increase in production and no further NFEs recorded. Lowering of a third ESP to a point as close as possible to the liner hanger did not achieve any long-term change in production performance. With the success of the inverted shroud, a second installation was completed on the third well where the ESP was being lowered. A production increase and prevention of NFEs were documented like the first shroud installation, confirming the benefit of the shrouded ESP design. The completion changes confirmed that suitable adjustments to mitigate the effects of NCG injection are possible, with further development on design required to optimize for production capacity and long-term performance.
With the results seen so far, further installations will be completed in the future on appropriate candidates to continue to mitigate the effect on ESPs of produced NCG volumes.
Riding through Power Disturbances using Local Energy Storage
Authors: Burley Colt , Arefeen Mohammed , Davidson Arran 
Published: September 2021

Abstract
The nature of Oil and Gas production presents numerous challenges for creating and maintaining reliable electrical infrastructure. Production assets are often widely dispersed over remote geographical areas, leaving them vulnerable to wildlife, storms and poor load management. Unfortunately for ESPs, even an extremely short interruption in electrical service can lead to significant downtime, stress on equipment, and additional field labor costs. The economic and operational advantages to providing a readily available, alternative source of power during these short duration events is significant. This paper describes an effective, economical approach that is based on locally situated energy storage with the appropriate control circuitry.
The existing Variable Speed Drive (VSD) architecture allows for the storage system to be constantly connected to the ESP's electrical system, allowing for an ever-present power supply without the need for mechanical switching. The ride-through system was designed to keep a fully loaded ESP system, of corresponding size, operational during most temporary power disturbances. At the conclusion of rigorous laboratory testing, the ride-through system was installed in the field and was subjected to simulated outages. Precision electrical monitoring equipment was installed to record voltage and current during genuine disruptions and interruptions. Records from field testing and genuine events confirmed the viability of local storage systems utilizing supercapacitors. The energy storage system provided a steady supply of power and consistently prevented shutdowns during common power system disruptions. Due to its capacity to store a considerable amount of power, the system demonstrated an ability to ride-through both multiple disturbances in short succession as well as outages lasting as long as 8 seconds, even under full load.
Intentionally Deadheading SAGD ESPs - An Unconventional Approach to Improve Run Life
Authors: Studer J. Daine , Chacin Jesus E. , Walters Roger , Nguyen Hoai Ann 
Published: September 2021

Abstract
SAGD ESPs run at the highest motor temperatures current technology allows. However, they cool very rapidly when shutdown. High cooling rates promote motor oil volumetric contraction, eventually leading to wellbore fluid ingress and short-circuited motors. The Paper presents successful field tests designed to decrease ESP cooling rates by inducing controlled deadheads, rather than shutting down ESPs. Various extended deadhead field trials (up to 70+ days duration) validated the approach, while confirming that no deadhead related ESP damage was induced.
ESP temperature changes were measured using fiber optics strings installed as part of the usual completion in 60+ wells, during a four week-long field-wide plant maintenance turn-around. While cooling rates varied somewhat from well to well, they all showed very similar behavior and were very well fitted with a log-normal distribution, R2factor &gt; 95%. Most ESP temperatures decreased between 50°C to 120°C in a week. This data was used as a general baseline to support the deadheading field trials.
An ESP was fitted internally with an RTD at the base of the motor and externally with a clamped fiber optics string. This ESP was operated normally at 55 Hz for a few months. An 8-hour shut down test established an initial base line cooling rate of 6.6°C/hour. Subsequent 6-hour deadhead tests at 30Hz and 45 Hz showed decreased cooling rates of 4.0°C/hour and 2.2°C/hour, respectively. This result clearly established the potential to deadhead at different frequencies to obtain different lower cooling rates.
Finally, two extended deadhead tests (3 and 10 weeks in duration) were executed to help determine if it was possible to induce damage in SAGD ESPs by deadheading, as is usually the case in most non-thermal applications. These ESPs operated normally after the extended tests and one was dismantled upon failure, looking for any signs of deadhead damage.
Results presented show that deadheading SAGD ESPs provides the opportunity to safely minimize ESP thermal cycles, which could lead to a significant improvement in ESP run life.