bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of the oxidation state and morphology of SnOx-based electrocatalysts on the CO2 reduction reaction
Authors: Puppin Lara G. , da Silva Luís F. , Carmo Marcelo , Varela Hamilton , Lopes Osmando F. 
Published: June 2021

AbstractCO2 electrochemical reduction reaction (CO2RR) is an attractive strategy for closing the anthropogenic carbon cycle and storing intermittent renewable energy. Tin-based electrocatalysts exhibit remarkable properties for reducing CO2 into HCOOH. However, the effects of morphology and oxidation state of tin-based electrocatalysts on the performance of CO2 reduction have not been well-described. We evaluate the oxidation state and particle size of SnOx for CO2 reduction. SnOx was effective for converting CO2 into formic acid, reaching a maximum selectivity of 69%. The SnO exhibited high activity for CO2RR compared to SnO2 electrocatalysts. A pre-reduction step of a SnO2 electrocatalyst increased its CO2 reduction performance, confirming that Sn2+ is more active than Sn4+ sites. The microsized SnO2 is more effective for converting CO2 into formic acid than nanosized SnO2, likely due to the impurities of nanosized SnO2. We illuminated the role played by both SnOx particle size and oxidation state on CO2RR performance.
Graphic abstract
Experimental characterization of natural fibre–soil interaction: lessons for earthen construction
Authors: Vincenzini Alessandra , Augarde Charles E. , Gioffrè Massimiliano 
Published: June 2021

AbstractEarthen construction materials are the subject of renewed interest due to the rising alarm about environmental pollution from the construction industry. Current research efforts are focused on improving the mechanical properties of earthen materials to make them modern and competitive. To increase strength and improve ductility fibres can be added to the soil mixture and if natural fibres are used one achieves stabilisation in an environmentally friendly way. Several previous studies have dealt with the behaviour of this composite material at a macroscopic level and on the general interaction between fibres and soil, but there is little published research on the interfacial mechanical interaction between natural fibre reinforcement and a soil matrix which is key to the former. This paper attempts to fill this gap by presenting and discussing laboratory results from a large campaign of pull-out tests conducted on composite earthen samples. The variables investigated here are the nature of the fibres (i.e. single or collections twisted together) and the use of fibre treatments such as PVA glue and baking soda. In the study both fibre–soil failure and soil-soil failure are investigated and the results lead to conclusions as to appropriate use of fibres to reinforce earthen construction materials.
A CONTRIBUIÇÃO DOS RECURSOS NARRATIVOS NA CONSTRUÇÃO DAS PERSONAGENS ILIÁDICAS
Authors: Fortuna Gabriel Galdino 
Published: June 2021

Este artigo visa usar a narratologia para demonstrar a existência de consciência reflexiva, profundidade e conflito interno nas personagens da Ilíada, utilizamos como suporte metodológico autores oriundos das últimas três décadas que aplicaram nas obras homéricas os conceitos desenvolvidos por Genette (1972) e Mieke Bal (1985). A investigação sobre a natureza esférica das personagens responde a uma parte considerável da crítica do século XX que estigmatizou a Ilíada como uma mímeses ingênua da vida, detentora de um narrador distante, neutro e imparcial, responsável por impedir o aprofundamento nas camadas estruturais da obra, em especial no que concerne às personagens e à trama. Para a investigação deste tema, colocamos em evidência três recursos narrativos identificados no épico em questão: as focalizações, as alterações na quantidade de informação fornecida ao leitor e as metalepses.
Hozzájárul-e a helyi élelmiszer vásárlás a helyi gazdaság fejlődéséhez? Egy szisztematikus irodalmi áttekintés
Authors: Szente Viktória , Fertő Imre , Benedek Zsófia 
Published: June 2021

Általános feltevés, hogy a helyi élelmiszerek értékesítése pozitív hatással van a helyi gazdaság teljesítményére. Cikkünkben megvizsgáljuk, hogy az eddigi kutatások mennyiben támasztják alá ezt a vélekedést. A ScienceDirect, Wiley Online Library, Taylor and Francis Online, SpringerLink, AgECON, Emerald és Sage adatbázisban fellelhető, 2000 és 2019 között publikált, angol nyelvű folyóiratcikkek kerültek szisztematikus áttekintésre. Emellett kiegészítő keresést végeztünk a Google Tudós keresőmotor felhasználásával. A téma jellegénél fogva több szinonima figyelembe vételével végeztük az adatgyűjtést, ami adatbázisonként 42-féle kulcsszavas keresést eredményezett. A multiplikátor hatás négyféle tényezőjére: a kibocsátási, a hozzáadott érték, a jövedelmi, valamint a foglalkoztatási multiplikátorra vonatkozóan kerestünk információkat.
Az első körben beválogatott 14 819 cikk közül mindössze 25 felelt meg a kutatási kritériumoknak. 24 közlemény szerint a helyi élelmiszerek iránti kereslet növekedése pozitív hatást gyakorolt a multiplikátor hatás valamely mutatójára, de 6 esetben más mutató esetében már nem tudtak ilyen kedvező hatást kimutatni. Egy tanulmány pedig egyik tényező esetében sem talált összefüggést. Eredményeink szerint a helyi élelmiszerek pozitív hatása leginkább a foglalkoztatásban és a jövedelmek növekedésében megfigyelhető, míg a kibocsátási és a hozzáadott érték multiplikátorok megjelenése sokkal inkább helyzetfüggő, nehezen vagy nem kimutatható. A jelenleg használt módszerek legtöbbjénél továbbá kisebb-nagyobb felülbecslés is feltételezhető. A helyi élelmiszerek helyi gazdaságra gyakorolt valós hatásának méréséhez további kutatásokra van szükség.
Fear of Childbirth and Associated Factors Among Pregnant Mothers Who Attend Antenatal Care Service at Jinka Public Health Facilities, Jinka Town, Southern Ethiopia
Authors: Yetwale Aynalem , Melkamu Eneyew 
Published: June 2021

BACKGROUNDWomen face many challenges from conception to postpartum, and fear of childbirth is one of the challenges the women encounter during pregnancy. This could have resulted from different perspectives and it could in turn lead to various pregnancy and childbirth problems. Thus, understanding childbirth fear and factors associated with this is of paramount importance and this study was aimed at addressing this issue.METHODOLOGYA facility-based cross-sectional study was done on 423 pregnant mothers who came for antenatal care services at Jinka hospital and Jinka health center. The study was conducted from June 1to 30, 2018. The sample size was calculated using the single population proportion formula and samples were taken after proportional allocation was done for the hospital and health center using the proportion allocation formula. Individual participants were selected with a systematic sampling technique using k-value of 2 for both the hospital and health center and the first participant was selected by the lottery method from the first two samples. Data were entered into epi-data version 3.1.1. and exported into statistical packages for social sciences version 21.0 for cleaning and further analysis. The level of significance was declared at a p value of less than 0.05 in multivariable logistic regression model. Narratives, figures, and tables were used to put the result.RESULTFrom 423 samples, two of the questionnaires were incomplete and thus 421 were used for analysis giving a response rate of 99.5%. Around a quarter of 102 (24.2%) mothers had fear of childbirth and the remaining 319 (75.8%) had no fear of childbirth. From the factors under consideration, history of previous pregnancy complications, previous history of labor and delivery complications, educational status, and depression status were significantly associated with a mother's fear of childbirth.CONCLUSIONEven though it is physiological to have some fear of childbirth, the figure obtained is relatively higher. Factors found to have a significant effect on childbirth fear are those which could be tackled through improved health literacy and integrated maternal health services.
Patologia Vestibular em Idade Pediátrica: Análise Retrospetiva e Revisão da Literatura
Authors: Lima António Fontes , Moreira Filipa Carvalho , Menezes Ana Sousa , Costa Isabel Esteves , Azevedo Cátia , Vilarinho Sergio , Dias Luis 
Published: June 2021

Introdução: A patologia vestibular na população pediátrica é um tema bastante controverso, mas que tem ganho cada vez mais destaque. A prevalência reportada nesta população varia entre 0,7% e 15%. No entanto, este valor pode estar subestimado, uma vez que a sua forma de expressão na população pediátrica é muito diferente da dos adultos, podendo ir desde a vertigem rotatória até queixas de alterações da visão, cefaleias, atraso motor ou dificuldades na aprendizagem. Embora na literatura a otite média com efusão seja considerada a principal causa de disfunção vestibular nesta faixa etária, existem outras que devem ser consideradas. O objetivo deste estudo foi descrever as características clínicas da população pediátrica encaminhada para avaliação em consulta de Otorrinolaringologia num hospital terciário, por suspeita de disfunção vestibular, desde o ano de 2013 até 2017; Também se pretendeu comparar os resultados e realizar uma revisão da literatura acerca das etiologias mais frequentes, características diagnósticas e abordagem terapêutica.Material e Métodos: Foram analisados de forma retrospetiva os processos clínicos dos doentes observados na consulta de subespecialidade de Vertigem de Otorrinolaringologia com idades entre 0 e 18 anos. Foram excluídos os doentes com diagnóstico de otite média com efusão.Resultados: Cumpriam os critérios de inclusão 37 doentes, dos quais 59% eram do sexo feminino, sendo a idade média da primeira consulta de 10,9 anos. O motivo mais frequente de referenciação foi a vertigem rotatória. As náuseas e cefaleias foram também sintomas frequentemente descritos. Todos os doentes foram submetidos a audiometria tonal; a videonistagmografia foi realizada em 41% dos casos; exames de imagem foram realizados em 59% dos doentes. No que respeita às etiologias do quadro, as mais frequentes foram a enxaqueca vestibular e a vertigem paroxística benigna da infância (ambas em 27% dos casos), seguida da neuronite vestibular (em 22% dos casos).Discussão: Embora os resultados sejam, em parte, sobreponíveis à literatura, comparativamente a outros centros de referência a diversidade de motivos de referenciação e de patologias é menor, o que pode apontar para o subdiagnóstico da disfunção vestibular nesta faixa etária.Conclusão: A disfunção vestibular em idade pediátrica pode ter uma multiplicidade de etiologias, pelo que pediatras, neurologistas, fisiatras, médicos de família e otorrinolaringologistas devem estar alerta para as diversas formas de apresentação desta entidade. Deverão ser criados protocolos de referenciação e avaliação adequados para esta população.
Intelligent Pressure Control System for MPD
Authors: Song Zhao Hui , Li Fu Qiang , Xie Deng Pan , Zhu John , Zeng Liam , Wang Xu Dong 
Published: June 2021

Abstract
MPD (Managed Pressure Drilling) is an important technique for challenging drilling operations especially in narrow operational windows. This paper is to introduce the IPC (Intelligent Pressure Control) system with super compact footprint, unique algorithm and IoT (Internet of Things) feature which bring operator a fresh understanding of MPD operation.
IPC system is equipped with the ultra-compact MPD manifold (L11.75ft × W7.50ft × H9.08ft) with complete functionality of measurement & automatic control, benefit the operators on footprint reducing for limited field space. With the unique algorithm integrated in iPWD (Intellegent Pressure While Drilling) module, the real time downhole pressure data could be generated without any downhole PWD (Pressure While Drilling) sensor, the deviation between iPWD data and real PWD data is within 3%, which was proven in field operations. NEBULA system is an add-on feature for IPC system, using cloud and IoT technologies, it could track the equipment’s specific location, working status and parameters, providing statistical diagnosis based on data collected from field operations, which helps operators to make decisions quickly. The data uploaded to cloud could generate different reports based on end user’s requirements to analyze drilling operation challenges or difficulties. You can receive all data provided by NEBULA system on your cellphone and PC (Personal Computer) at any time anywhere.
The compact design of IPC system manifold benefit the operator by minimizing the footprint in limited field space especially for offshore operations; iPWD module provides full time data during drilling operation regardless of connection or any pump off scenarios; also erases the need of PWD sensor on BHA(Bottom Hole Assembly). NEBULA system featured on IPC equipment generates different report based on real-time data received on site after cloud calculation and big data analysis, all data and report could be accessed via cellphone or PC at any time anywhere, which can be an upgraded intelligent features on conventional MPD technology.
A Comprehensive Model for Gas Influx Detection and Control While Managed Pressure Drilling and Its Application
Authors: Fan Hongkang , Jiang Shanhong , Zhou XianHai , Wang Guo , Zhou Haobo , Zhang Hongning 
Published: June 2021

Abstract
The equipment commonly used in managed pressure drilling (MPD) allows alternative responses to kicks that do not need to stop the pump or shut in the well. The pivotal issue of kick control for MPD is the early gas influx detection and the optimal initial response when the kick was detected during drilling. The careful research on gas influx detection and the corresponding control method is very important.
Firstly, the valve opening, bottom hole and well head pressure variation characteristics were analyzed based on the real-time measured data, and then the valve opening and pressure signature of gas influx for different MPD modes (CBHP, CWHP, MFC) was obtained based on the theoretical and model analysis, in which the pressure variation caused by the tripping, ROP and flow rate variation were taken into account, through which the gas kick can accurately detected as soon as quickly. Secondly, the influence factors for initial response selection of kick control was analyzed, and then the comprehensive optimization schedule of response for kick control was established, in which several factors were took into account, such as formation characteristics, drilling conditions, influx intensity and so on, through which the best mode for kick control can be obtained easily. Moreover, integrated software that combined kick detection and gas kick control simulation was developed based on which the best pressure control procedure and kick initial response can be obtained easily.
The gas influx detection and control technique has been applied in Fuling shale gas field of SINOPEC, which is the first large-scale commercial development shale gas field of China. The results show that we can make precisely gas detection based on the new early gas influx detection method and the kick can also be control very well based on the optimization method. Based on the proposed method for kick detection and control, the NPT have been reduced more than 60%.
This study will presented a novel gas kick detection theoretical model for all common MPD modes, and the gas influx control optimal procedure. Through the field application in shale gas drilling, the results show that the NPT has been reduced obviously, and the optimal kick control was designed has successfully prevented the serious kick and reduced the drilling cost.
Resin Squeeze Operation to Successfully Seal Micro-Channels and Eliminate Sustained Casing Pressure of a Sour Gas Well
Authors: Wang Ying , Zheng Xin , Li Li , Yuan Jianbo , Vo Minh , Reading Richard , Zhang Junliang 
Published: June 2021

Abstract
This paper describes the successful resin squeeze operation to seal off a micro-annulus between the 7" and 9-5/8" casings on a sour gas well located in Sichuan Basin, China. Integrated plug and abandonment were also essential to eliminate the risk of potential H2S exposure presented to the residents around this area.
Resin, as a new alternative sealing technology, was technically evaluated, laboratory tested, and then chosen for squeezing into a micro-annulus to stop gas migration for its solids-free and low-viscosity properties compared to a conventional cement. The squeeze job was designed by taking the casing yield strength as the pressure limit (Confirmed by caliper log the casing was in good condition) and determining the resin pumping volume based on estimated resin squeeze volume and the remaining resin plug length. A "Braden-head" squeeze method was selected considering the low injection rate observed during the water injection test. Both stage-up and stage down squeezing techniques (hesitation squeeze of increasing and decreasing wellhead pressure stage by stage) were performed to maximize the injected volume of the resin sealant. A total of 800 L of 9.16 lb/gal resin was placed into a 4 ft milled interval, and 50 L were successfully squeezed into the 7" × 9-5/8" casing annulus. An operational learning was that resin injection is greatly improved during the stage-down process while keeping the casing annulus open. Evidence that the micro-annulus leak path had been sealed was an observation of 0 psi on the 7" × 9-5/8" casing annulus after resin fully set.
The method of locating the optimal spot to squeeze resin involved noise logging to analyze for a potential gas source in the annulus. The post job results confirmed that resin acts effectively as an annular barrier in the repair of gas leaks in the small volume situations where micro-annulus exists in the cement sheath. For large voids such as inside 7" casing, a combination of cement plug plus mechanical barrier is recommended to be placed directly above resin plugs to complete permanent plug and abandonment of the wellbore.
Breakthrough Cementing Technology for Enhanced Well Integrity in Myanmar Offshore Shallow Gas Well
Authors: Li Yi , Ullah Mohammad Solim , Ai Wu Chang , Khumtong Thirayu , Temaismithi Kantaphon , Luo Yu Wei , Xiong Shao Chun , Qi Ying , Ding Xi , Zhang Hao , Xu Qian Fu , Yan Ping 
Published: June 2021

Abstract
In Myanmar offshore, a substantially promising gas reservoir was discovered, the objective of primary cementing is to achieve long term zonal isolation, as any gas migration to surface would cause production loss, as well as significant security issues. Remedial cementing work will cause costly non production time, while the result will be compromised. Shallow gas migration, lost circulation and mud removal, all these factors cause undesired negative effects for cementing design, While the objective is to provide a firm barrier and good zonal isolation, this paper will describe in details the cementing challenge, the methodology, and how the slurry parameter was designed and evaluated for a Fit-For-Purpose solution.
Using Data-Mining CRISP-DM Methodology to Predict Drilling Troubles in Real-Time
Authors: Al Gharbi Salem , Al-Majed Abdulaziz , Abdulraheem Abdulazeez , Patil Shirish , Elkatatny Salaheldin 
Published: June 2021

Abstract
Drilling is considered one of the most challenging and costly operations in the oil and gas industry. Several initiatives were applied to reduce the cost and increase the effectiveness of drilling operations. One of the frequent difficulties that faces these operations is unexpected drilling troubles that take place and stops the operation, resulting in losing a lot of time and money, and could lead to safety issues culminating in a fatality situation. For that, the industry is in continues efforts to prevent drilling troubles. Part of these efforts is utilizing the artificial intelligence (AI) technologies to identify troubles in advance and prevent them before maturing to a serious situation. Multiple approaches were tried; however, errors and significant deviation were observed when comparing the prediction results to the actual drilling data. This could be due to the improper design of the artificial intelligent technology or inappropriate data processing. Therefore, searching for dynamic and adequate artificial intelligent technology and encapsulated data processing model is very essential.
This paper presents an effective data-mining methodology to determine the most efficient artificial intelligent technology and the applicable data processing techniques, to identify the early symptoms of drilling troubles in real-time. This methodology is CRISP-DM that stands for Cross Industry Standard Process for Data Mining. This methodology consists of the following phases: Business Understanding, Data Understanding, Data Preparation, Modeling, Evaluation and Deployment. During these phases, multiple data-quality techniques were applied to improve the reliability of the real-time data.
The developed model presented a significant improvement in identifying the drilling troubles in advance, compared to the current practice. Parameters such as hook-load and bit-depth, were studied. Actual data from several oil fields were used to develop and validate this smart model. This model provided the drilling engineers and operation crew with bigger window to mitigate the situation and resolve it, prevent the occurrence of several drilling troubles, result in big time and cost savings. In addition to the time and cost savings, CRISP-DM provided the artificial intelligent experts and the drilling domain experts with a framework to exchange knowledge and sharply increase the synergy between the two domains, which lead to a common and clear understanding, and long-term successful drilling and AI teams collaboration.
The novelty of this paper is the introduction of data-mining CRIPS methodology for the first time in the prediction of drilling troubles. It enabled the development of a successful artificial intelligence model that outperformed other drilling troubles prediction practices.