bluuebunny/crossref_metadata_2025 huggingface dataset:
Textos Digitales y Comprensión Lectora en Primaria: Una Revisión de Literatura
Authors: Neva Omar Alonso
Published: June 2021

La era de la información ha planteado diversos retos para la educación, pero también ha presentado oportunidades para mejorar las prácticas de enseñanza. Este artículo se propone revisar y analizar los avances obtenidos en las investigaciones en inglés y español de los años 2015 a 2020, respecto a la utilización de textos digitales para la comprensión lectora en educación primaria. Se utiliza un enfoque mixto y una metodología documental, para realizar una revisión sistemática de literatura artículos publicados en bases de datos reconocidas entre los años 2015 y 2020. Se organizó el corpus documental de 50 artículos en fichas temáticas según categorías preestablecidas y tendencias estadísticas de la producción bibliográfica. Los resultados muestran tendencias respecto al país, participantes, método, tipos de texto digital y tecnologías utilizadas, y coincidencias o discordancias de los resultados obtenidos en la comprensión y aspectos de la lectura. Se concluye que los textos digitales aumentan la motivación hacia la lectura, facilitan la comprensión lectora y promueven el aprendizaje colaborativo, no obstante, en algunos casos los resultados son limitados o no difieren de los textos físicos.
e-Learning Integrated STEM Education Center (eLISE) in Asia: A Reflection Case Study of Taiwan and Vietnam Research Project
Authors: Chang Chun- Yen , Ling Lin Pei- , Thị Tố Khuyên Nguyễn
Published: June 2021

Objective:This article describes the implementation plan, advance and future directions of the academic and educational research center eLISE (e-Learning Integrated STEM Education Center) whose foundation intends to narrow the collaboration between Taiwan and Vietnam in e-Learning and STEM (Science, Technology, Engineering, Mathematics) in the framework of the New Southbound Policy[1], a long-term project announced by the Taiwanese government to strengthen the partnership with South Asian countries.

Originality / contribution:This article contributes to the reflection about the promotion of international cooperation in innovation, scientific and technological research as well as the analysis of public policies guided towards e-Learning and STEM innovation.

Information collection method / strategies: The stages of the research and innovation process were (1) Innovation e-Learning and STEM Instruction teaching material and module: test application, teacher workshops and interviews (2) Innovation e-Learning and STEM assessment through CloudClassRoom observation with Gamified Electronic Audio Response System and Google Bert. 

Conclusions: The description of the implementation of eLISE, the explanation of the development of innovative curriculums and teacher workshops, as well as the talent exchange and the cooperation between industry and academy, highlights the importance of cultivate talents and workforces educated through STEM and e-Learning, seeking regional development and prosperity for both, Taiwan and Vietnam.

 

[1] Office of Trade Negotiations, executive Yuan, Bureau of Foreign Trade, T. M. of E. A. New Southbound Policy Guidelines and Action Plan. (Taipei, 2017).
LA CULTURA DE LA RESISTENCIA JUVENIL Y EL PROCESO EMANCIPADOR
Authors: Biagini Hugo E.
Published: June 2021

Se sintetiza en el papel el protagonismo de la juventud Latinoamericana durante la independencia, el movimiento reformista de Córdoba y en las vísperas del bicentenario a través del complejo fenómeno de la altermundialización. A través de posiciones disidentes y remisas al principio de autoridad, aquéllos han exigido la modernización de la enseñanza y el acceso a los adelantos científicos, junto a la apertura de la universidad al pueblo y la sociedad.
CONTRA LA DESPOLITIZACIÓN DE LA MEMORIA. ENTREVISTA CON CARLOS ANTONIO AGUIRRE ROJAS, A PROPÓSITO DE LOS 40 AÑOS DE MAYO DEL 68
Authors: Correa Ramírez John Jaime
Published: June 2021

Con motivo de la celebración de los 40 años de mayo del 68, se realizaron algunas conferencias con invitados internacionales en la Universidad Tecnológica de Pereira. Se aprovecho la visita del historiador mexicano Carlos Antonio Aguirre Rojas, para realizar una entrevista en la que ampliara sus conceptos respecto al significado histórico de Mayo del 68, su pervivencia en los imaginarios de muchos movimientos estudiantiles del presente, y al mismo tiempo, sus diferentes percepciones respecto a la historiografía tradicional y al movimiento zapatista.
POLÍTICA, UNIVERSIDAD Y SOCIEDAD EN PUEBLA, EL ASCENSO DEL PARTIDO COMUNISTA MEXICANO EN LA UAP, 1970-1972
Authors: Márquez Carrillo Jesús , Diéguez Delgadillo Paz
Published: June 2021

En 1972, miembros del Partido Comunista Mexicano asumieron ladirección de la Universidad Autónoma de Puebla. El propósito del presente artículo es describir y analizar el proceso inmediato por el cual llegaron al poder, considerando los discursos políticos que les influyeron y el problema coyuntural de la masificación, más los vínculos de la Universidad con la movilización social y asimismo sus conflictos con los grupos locales de poder. Los materiales que lesirven de base son documentos de archivo, noticias hemerográficas y bibliografía.
MOVIMENTO ESTUDANTIL NO BRASIL: LUTAS PASSADAS, DESAFIOS PRESENTES
Authors: De Moraes Freire Silene
Published: June 2021

El presente artículo, se propone contribuir para el todavía incipientedebate, en América Latina, en torno de la trayectoria del movimiento estudiantil brasileño, sus avances y retrocesos en lo referente a los diversos contextos históricos de sus luchas. De este modo, la intención es contribuir para la comprensión de la historia del movimiento estudiantil en Brasil con base en la comprensión del significado de las luchas pasadas, y de los desafíos actuales.
Reseñas de Eventos
Authors: RHELA Revista
Published: June 2021

Seccion Reseñas de Eventos
Youth and Agriculture in Sub-Saharan Africa: Time to Reset Policy
Authors: Sumberg James
Published: June 2021

Agriculture is widely promoted as the only economic sector capable of providing employment to the millions of rural Africans entering the labour market in the coming decades. Two competing visions vie for attention. The first is of innovative, entrepreneurial youth driving rural transformation; the second is of agriculture providing young people with little more than survival opportunities. Between these two visions are the young people themselves, actively building their livelihoods, which most often include some engagement with agriculture. Policy interventions need to better consider how young people engage with the rural economy and how they imagine their futures.
Caracterização das questões de Biologia do Vestibular Estadual do Rio de Janeiro e do Exame Nacional do Ensino Médio
Authors: Pacheco Renata Gaudard , Santos Jorge Augusto  de Souza , Soares Alexandre Mioth
Published: June 2021

This study aimed to characterize Biology questions on the National High School Exam and the Rio de Janeiro State University Entrance Test. The topics analyzed in this study were: Introduction to Life, Biochemistry, Cell Biology, Animal Tissues, Living Beings, Compared Anatomy and Physiology, Genetics, Evolution, Ecology and Environmental Sciences, Morphology and Physiology of Vegetables. As a result, we have found 320 Biology questions in the Rio de Janeiro State Entrance Test, between the years 1997 and 2020, and 396 in the National High School Entrance Exam, between the years 1998 and 2019. The Rio de Janeiro State Entrance Test was characterized by the predominance of questions related to the structure and function of the human body, while the National High School Exam was characterized by the predominance of Ecology and Environment issues. As a result, it is expected that this study be useful as a basis for better understanding of the differences between these two higher education assessment tests.
A "fantasia" da pandemia de Covid-19 em discursos políticos: as aspas e seus efeitos de sentido no gênero jornalístico artigo de opinião
Authors: Braga Letícia Cunha , Bêtta Thiago Eugênio Lorêdo
Published: June 2021

According to Maingueneau’s (1997) conceptions, which emphasizes the relevance of considering the conditions of production when using quotation marks, this work aims to discuss the effects of meaning signaled by the graphic sign, which, besides being a linguistic mark, it is a discursive and argumentative resource present in the journalistic genre opinion article, in which the opinionated content stands out. We adopted the methodology of exploratory research based on discursive theories, covering the perspectives of Maingueneau (1997), Charaudeau (2013), Orlandi (2008) and Pêcheux (1997). In a qualitative approach, we have analyzed the opinion article “Trump e Bolsonaro: aves de mesma plumagem”, published in Folha de São Paulo, to investigate the effects of meaning that quotation marks play in varied statements. The results show that it is essential to consider the circumstantial aspects of the discursive process for the interpretation of the meaning effects produced by the quotation marks and that the genre opinion article has a lot to offer for a linguistic-discursive analysis due to the articulations elaborated with the premise of persuading readers to adhere to a point of view, according to the writers’ political position.
Impact of Confinement on Eating Disorders
Authors: Crawford Joana
Published: June 2021

N/a.
Mapeando o sagrado
Authors: Valle Arthur
Published: June 2021

O artigo apresenta os resultados iniciais de uma investigação que visa a registrar e geolocalizar, em um mapa digital interativo, locais de culto relacionados às religiões afrobrasileiras e objetos de arte sacra deles oriundos. Em seu estágio atual, nosso mapeamento se baseia em um corpus de 160 notícias publicadas na imprensa da cidade do Rio de Janeiro entre 1890 e 1941. Tanto quanto um panorama da arte sacra e locais de culto afrobrasileiros, o mapa se pretende como um ato de memória contra o esquecimento da repressão policial que se abateu sobre as religiões afrobrasileiras no período em questão, bem como uma denúncia do racismo que a fundamentava e que ainda vigora no Brasil dos dias atuais.
REMOVAL OF Cu(II), Cd(II), Co(II), Zn(II), Cr(VI) FROM WASTEWATER BY STABILIZED NANOSCALE ZERO-VALENT IRON
Authors: Kholodko Yurii M. , Bondarieva Antonina I. , Tobilko Viktoriia Yu. , Kovalchuk Iryna A. , Kornilovych Borys Yu.
Published: June 2021

Background. Obtaining sorption materials based on natural raw materials for water purification from pollution by heavy metal ions is an urgent task of our time. Composites with zero-valent iron nanoparticles immobilized on the surface of clay minerals show rather high sorption properties concerning ions of some heavy metals. However, there are only a few proceedings devoted to the physicochemical substantiation of wastewater treatment processes containing a complex mixture of such pollutants.
Objective. The purpose of the paper is to study the physicochemical regularities of wastewater treatment from a mixture of ions of heavy metals Cu(II), Cd(II), Co(II), Zn(II), Cr(VI) using stabilized nano dispersed powders of zero-valent iron.
Methods. The phase composition and structural-sorption characteristics of palygorskite and composites were studied by X-ray phase analysis and low-temperature adsorption-desorption of nitrogen. The efficiency of removal of metal ions by silicate materials was investigated using the sorption method. The equilibrium concentrations of each of the metals were determined by inductively coupled plasma atomic emission spectrometry.
Results. We have investigated the physicochemical features of wastewater treatment containing a complex mixture of heavy metal ions (Cu(II), Cd(II), Zn(II), Co(II), Cr(VI)). The phase composition and structural-sorption properties of stabilized nano dispersed powders of zero-valent iron have been studied. It has been experimentally confirmed that the materials obtained have significantly better sorption properties for the removal of heavy metals from aqueous solutions in comparison with natural palygorskite. Using Freundlich and Langmuir equations sorption isotherms were calculated.
Conclusions. It has been established that stabilized nano dispersed powders of zero-valent iron can be successfully used for the purification of wastewater containing a mixture of toxic ions Cu(II), Cd(II), Co(II), Zn(II) and Cr(VI). It is shown that the degree of water purification by the obtained sorbents is 3–5 times higher than that for the unmodified mineral. A significant increase in the values of sorption of anionic forms of Cr(VI), which are difficult to remove from polluted waters by natural ion exchangers, has been determined.
MODEL PREDICTIVE CONTROL TOOLBOX DESIGN FOR NONSTATIONARY PROCESS
Authors: Stepanets Oleksandr V. , Mariiash Yurii I.
Published: June 2021

Background. Model predictive control (MPC) approach is the basic feedback scheme, combined with high adaptive properties, which determines its successful use in the practice of design and operation of control systems. These advantages allow managing multidimensional objects with a complex structure, including nonlinearity, optimizing processes in real time within the constraints on controlled and managed variables, taking into account uncertainties in the task of objects and perturbations.
Objective. The purpose of the paper is to design and analyse control system of carbon monoxide oxidation in the convector cavity based on MPC with linear-quadratic cost functional with constraint.
Methods. The design of MPC is based on mathematical model of an object (relatively simple). At the current step, the prediction of object dynamic response on some final period of time (prediction horizon) is carried out; control optimization is performed, the purpose of which is to approximate the control variables of the prediction model to the corresponding setpoint on the predict horizon. The found optimal control is applied and measurement of an actual state of object at the end of a step is carried out. The prediction horizon is shifted one step further, and this algorithm are repeated.
Results. The results of modeling the automatic control system show that the MPC approach provides maintenance of carbon dioxide content when changing oxygen consumption and overshoot caused by introduction bulk does not exceed 0.6 % that meets the technological requirements of the process.
Conclusions. A fuse of the MPC and the quadratic functional given the constraints on the input signals is proposed. The problems of control degree of carbon oxidation in the convector cavity include non-stationarity, so the use of classical control methods is difficult. The MPC approach minimizes the cost function that characterizes the quality of the process. The predicted behaviour of a dynamic system will usually differ from its actual motion. The obtained quadratic functional is optimized to find the optimal control of degree of CO oxidation to CO2.
DATA FILTERING TECHNIQUES IN DECISION SUPPORT SYSTEMS
Authors: Pantyeyev Roman L. , Timoshchuk Oksana L. , Huskova Vira H. , Bidyuk Petro I.
Published: June 2021

Background. The majority of modern dynamic processes in economy, finances, ecology, technologies and many other areas of studies exhibit short- and long-term nonlinear and nonstationary behavior. That is why it is required to create for their thorough analysis modern highly developed specialized instrumentation providing for appropriate preliminary statistical data processing, simulation state and parameter estimation and quality forecasting their evolution in time to be used in decision support systems (DSS).
Objective. The purpose of the paper is to perform introductory analysis of some modern methods for filtering statistical and experimental data; to consider modern filtering techniques on the basis of probabilistic Bayesian approach, that provide a possibility for preparing the data to adequate simulation, computing high quality state and forecast estimates for dynamic systems in stochastic environment and availability of measurement errors.
Methods. To implement modern data filtering techniques appropriate simulation and optimization procedures, probabilistic Bayesian methods of data analysis are utilized; simulation algorithms for parameter estimation, and criteria bases for analyzing quality of intermediate and final results in the frames of DSS are used.
Results. A set of data filtering techniques is presented to be used together with the models describing formally selected processes dynamics. The methodology is considered for implementation of probabilistic Bayesian filter based upon modern statistical data analysis techniques including application of appropriate simulation procedures.
Conclusions. Development of effective means for simulation, state estimation and forecasting dynamics of nonlinear nonstationary processes in various areas of human activities provides a possibility for high quality state and parameter estimation and compute short and middle term forecasts for their future evolution. The methods of optimal Kalman and probabilistic Bayesian filtering considered in the review provide a possibility for performing appropriate analysis of nonlinear nonstationary processes, compute forecasts and provide for managerial decision support on the basis of the forecast estimates.
HIGH RESOLUTION CAMERA DESIGN PLANNING THEORETICAL FOUNDATIONS FOR DRIVING SYSTEMS
Authors: Stadnichuk Viacheslav S. , Kolobrodov Valentin G. , Mosolab Oleksii O. , Kondratenko Denis Yu. , Ryabokon Dmytro I.
Published: June 2021

Background. Analysis of statistical data showed that in most cases the cause of the accident is driver error and, as a consequence, violation of traffic rules. In this regard, over the past 10 years, active developments in the field of recognition of road signs and other obstacles in the path of a car have been actively developing. Car manufacturers offer ready-made built-in systems, mounted behind the interior rearview mirror and connected to the car’s on-board computer, which carries out further control of the car in a critical situation. The main disadvantage of these systems of this class is the low range of recognition of road signs, the dependence of optical parameters on temperature and low light sensitivity.
Objective. The purpose of the paper is to model an athermal objective for a high-resolution camera, investigate the characteristics of lenses depending on the ambient temperature.
Methods. Analysis and modeling of objectives, lenses, optical glass from different materials.
Results. A high-resolution camera objective for all types of cars is proposed. An athermal objective was developed for a high-resolution camera.
Conclusions. The optimized athermal design of the visible spectrum objective for long-range car cameras is considered. Car cameras typically have a fixed focus, and forward-facing cameras typically require relatively long focal lengths to provide information about distant objects. The optical system for these cameras should provide high resolution, as well as operate in a wide range of ambient temperatures. The camera design parameters are derived from the functional requirements of road sign recognition at a distance of 200 m. The objective design has five lenses with spherical surfaces. The objective has a relative aperture of f/2 and a modulation transfer function (MTF) of more than 0.5 at 111 l/mm over the entire temperature range.
Vertical Boundary Mixing Events during Stratification Govern Heat and Nutrient Dynamics in Windy Tropical Lakes with High Water-Level Fluctuations: A Long-Term (2001-2018) Study
Authors: Merino-Ibarra Martín , Ramírez-Zierold Jorge A. , Valdespino-Castillo Patricia M. , Castillo-Sandoval Fermin Sergio , Guzmán-Arias Andrea P. , Barjau-Aguilar Mariel , Monroy-Ríos Emiliano , López-Gómez Luz M. , Sacristán-Ramírez Arantxa , Quintanilla-Terminel José G. , González–De Zayas Roberto , Jimenez-Contreras Jorge , Valeriano-Riveros María E. , Vilaclara-Fatjó Gloria , Sánchez-Carrillo Salvador
Published: June 2021

Physical processes play important roles in controlling eutrophication and oligotrophication. In stratified lakes, internal waves (IW) can cause vertical transport of heat and nutrients without breaking the stratification, through boundary mixing (BM) events. Such is the case in tropical Valle de Bravo (VB) lake, where strong diurnal winds drive IW, BM and hypolimnetic warming during stratification periods. We monitored VB during 18 years (2001-2018) when important water-level fluctuations (WLF) occurred, affecting mixing and nutrient flux. Mean hypolimnetic temperature increase (0.06–1.04°C month-1) occurred in all the stratifications monitored. We analyzed temperature distributions and modeled the hypolimnion heat budget to assess vertical mixing between layers (26,618–140,526 m-3h-1), vertical diffusivity coefficient KZ (6.2x10-7–3.3x10-6 m2s-1) and vertical nutrient entrainment to epilimnion on monthly scale. Stability also varied as a function of WLF. Nutrient flux to the epilimnion ranged 0.36–5.99 mg m-2d-1 for soluble reactive phosphorus (SRP) and 5.8–97.1 mg m-2d-1 for dissolved inorganic nitrogen (DIN). During low water-level years, vertical nutrient fluxes increase and can account for up to >40% of the total external nutrients load to the lake. Vertical mixing changes with WLF affect nutrient recycling, their flux to sediments, metabolic balance and planktonic composition of VB.
The Role of Cellular Stress in Intrauterine Growth Restriction and Postnatal Dysmetabolism
Authors: Oke Shelby L , Hardy Daniel Barry
Published: June 2021

Disruption of the in utero environment can have dire consequences on fetal growth and development. Intrauterine growth restriction (IUGR) is a pathological condition by which the fetus deviates from its expected growth trajectory, resulting in low birth weight and impaired organ function. The developmental origins of health and disease (DOHaD) postulates that IUGR has lifelong consequences on offspring well-being, as human studies have established an inverse relationship between birth weight and long-term metabolic health. While these trends are apparent in epidemiological data, animal studies have been essential in defining the molecular mechanisms that contribute to this relationship. One such mechanism is cellular stress, a prominent underlying cause of the metabolic syndrome. As such, this review considers the role of oxidative stress, mitochondrial dysfunction, endoplasmic reticulum (ER) stress, and inflammation in the pathogenesis of metabolic disease in IUGR offspring. In addition, we summarize how uncontrolled cellular stress can lead to programmed cell death within the metabolic organs of IUGR offspring.
Curcumin as a Natural Remedy for Atherosclerosis: A Pharmacological Review
Authors: Singh Laxman , Sharma Shikha , Xu Suowen , Tewari Devesh , Fang Jian
Published: June 2021

Curcumin, a hydrophobic bioactive constituent from Curcuma longa, has several health promoting properties including anti-atherosclerotic properties. Further, curcumin has blood glucose- and lipid-lowering properties, prophylactic, and therapeutic effects in other cardiometabolic diseases. Atherosclerosis is an umbrella term for a series of degenerative and hyperplasic lesions such as thickening or sclerosis in large and medium -sized artery walls that decrease vascular-wall elasticity and lumen diameter. The atherosclerotic cerebro-cardiovascular disease has become a major concern to human health in recent years. Considering the notable cardiovascular actions of curcumin, the present review summarizes the current status and future perspective of research on curcumin and its ability to prevent or treat atherosclerosis
Research on Parameters of Wire-Filling Laser Welding and Quenching Process for Joints Microstructure and Mechanical Property of BR1500HS Steel
Authors: Zhou Lianpu , Zhu Chundong , Ma Rongfei , Wei Zihao
Published: June 2021

With the aim to investigate the effect of parameter and quenching process on the joint of hot stamping steel by laser welding, the BR1500HS boron steel was welded by filling-wire laser welding with ER70-G welding wire under different parameters. The welded specimens were heated to 900℃ and held for 5min before water quenching. The universal material test machine, Optical micro-scope, Vickers hardness tester, scanning electron microscope and electron backscatter diffraction (EBSD) were used to characterize. The results showed that the macroscopic morphology of fusion zone (FZ) becomes from funnelform to hyperbolic curve shape when heat input increases and from hyperbolic curve shape to funnelform when wire-feed speed increases. The strength after quenching is more than 1557Mpa at heat input of 1040J/cm, wire feeding speed of 1.6m/min~1.8m/min and welding speed of 1.5m/min. EBSD test showed that the FZ and fine grain zone (FGZ) have more retained austenite (RA) than coarse grain zone (CGZ) before quenching and RA in FZ and heat affect zone (HAZ) decreased and distributed uniformed after quenching. The grain diameter in FZ distribute unevenly, with the maximum grain diameter larger than 40μm before quenching. After quenching, the grain diameter of FZ, HAZ and BM is more even and coarse grains in the FZ was refined. Before quenching, the microhardness of FZ and HAZ is of 450HV~500HV at different heat input and wire-feed speed and all region of joint keeps at 450HV~550HV after quenching. Most dimple and little river pattern in the joint fracture mor-phology before quenching indicates a well plasticity and most cleavage facet is observed after quenching due to the joint combine with martensite.
Development of Novel Construction Material from Food Waste
Authors: Machida Kota , Sakai Yuya
Published: June 2021

Highlights: A new material with a bending strength higher than that of concrete was developed using vegetable or fruit waste. The new material maintains the color, taste, and flavor of the original vegetable or fruit. Without water resistant treatment, the material is edible and can be conditioned with seasonings
Agriculture 4.0 and Smart Sensors. The Scientific Evolution of Digital Agriculture: Challenges and Opportunities
Authors: Sott Michele Kremer , Nascimento Leandro da Silva , Foguesatto Cristian Rogério , Furstenau Leonardo B. , Faccin Kadígia , Zawislak Paulo Antônio , Mellado Bruce , Kong Jude Dzevela , Bragazzi Nicola Luigi
Published: June 2021

: The agriculture sector is one of the backbones of many countries’ economies and its processes have been changing in order to enable technological adoption to increase productivity, quality, and sustainable development. In this research, we present a theoretical reflection through a scientific mapping of the adoption of precision techniques and breakthrough technologies in agriculture, the so-called Precision Agriculture (PA) and Agriculture 4.0 (A4.0). To do this, we used 4,694 documents from the Web of Science database to perform a Bibliometric Performance and Network Analysis (BPNA) of the literature with the support of the PICOC protocol and the SciMAT software. Our findings present 22 strategic themes related to Digital Agriculture (DA) such as Internet of Things (IoT) and Climate-smart Agriculture (CSA) among others, and the thematic network structures of the motor themes and the thematic evolution structure of the field of the study over time. In addition, our results discuss the main challenges and opportunities of DA. Our findings have the potential to provide insights for practitioners and researchers in decision-making and pave the way for future works.
Seroprevalence of Toxoplasma gondii in cats from Cyprus
Authors: Attipa Charalampos , Yiapanis Christos , Tasker Séverine , Diakou Anastasia
Published: June 2021

Toxoplasma gondii is a cosmopolitan protozoon parasite, and the causative agent of toxoplasmosis, one of the most prevalent zoonotic parasitic diseases. Cats, as definitive hosts, are spreaders of the parasite via their faeces, but this occurs only for a very short period in their life. Seropositivity in cats, although not associated with current shedding of the parasite, is indicative of the infection in a cat population and can be used to assess the infection risk for definitive and intermediate hosts in that area. In order to assess the prevalence of infection in cats living in Cyprus, 155 cats, originating from all districts of the country, were examined for the presence of T. gondii antibodies. Additionally, parameters such as age, sex, health status, lifestyle and concomitant infections were statistically assessed as potential risk factors for T. gondii seropositivity. Specific anti-T. gondii antibodies were detected in 50 (32.3%) cats, while the presence of feline immunodeficiency virus antibodies and a history of never having been vaccinated were statistically associated with T. gondii seropositivity on multivariate logistic regression model. This is the first report of T. gondii seroprevalence in cats in Cyprus and indicates that raised public awareness should be considered to prevent infection of animals and humans.
Deep ConvNet: Non-Random Weight Initialization for Repeatable Determinism, examined with FSGM
Authors: Rudd-Orthner Richard Niall Mark , Mihaylova Lyudmila
Published: June 2021

This paper presents a non-random weight initialization method in convolutional layers of neural networks examined with the Fast Gradient Sign Method (FSGM) attack. This paper's focus is convolutional layers, and are the layers that have been responsible for better than human performance in image categorization. The proposed method induces earlier learning through the use of striped forms, and as such has less unlearning of the existing random number speckled methods, consistent with the intuitions of Hubel and Wiesel. The proposed method provides a higher performing accuracy in a single epoch, with improvements of between 3-5% in a well known benchmark model, of which the first epoch is the most relevant as it is the epoch after initialization. The proposed method is also repeatable and deterministic, as a desirable quality for safety critical applications in image classification within sensors. That method is robust to Glorot/Xavier and He initialization limits as well. The proposed non-random initialization was examined under adversarial perturbation attack through the FGSM approach with transferred learning, as a technique to measure the affect in transferred learning with controlled distortions, and finds that the proposed method is less compromised to the original validation dataset, with higher distorted datasets.
Alternative Exhibition Spaces. Multi-criteria Method of Comparative Analysis
Authors: Stefańska Joanna , Kowalczyk Paulina , Gawlak Agata
Published: June 2021

The aim of this article is to make a multi-criteria analysis of various exhibition spaces of an originally non-exhibition character and to determine how these spaces affect the selection of works and the exhibition concept. The analysis is based on the exhibitions of art objects at collective exhibitions in unconventional architectural spaces: commercial, i.e. the modern office building of PBG Gallery Skalar Office Centre in Poznań, post-industrial i.e. in the former Zakłady Przemysłu Ziemniaczanego Lubanta S.A. and in the historic interior of the "U Jezuitów" Gallery of the Cultural Integration Centre in Poznań. The multi-criteria comparative analysis shows a variety of features of the studied spaces as well as the relationship between architecture and art and their mutual interaction. The participatory role of the non-exhibition space in the process of creating an exhibition and selecting works has been proven. It has also been confirmed that the presentation of works of art in originally non-exhibition spaces creates a new quality of the artwork. Unconventional architectural space, when used for the exhibition of works of art, expands and strengthens the area of ​​their influence through the interaction between the work and the architectural space. The specificity of the space adapted for exhibition needs, the presence and type of architectural details in the interior, the quantity and quality of light and its distribution in space, the volume and colour of the interior determine the exhibition space and influence the shape of the exhibitions organised and the reception of the artworks. The only condition for the change of the original function of an architectural space into that of an exhibition space is a coherent artistic vision of the creator. This should take into account the appropriate selection of the exhibited objects, where the process of searching for the relationship between architecture and art determines the features of the architectural space as integral components influencing the realisation of the exhibition .
Sodium Silicate Based Drilling Fluid Application in Gulf of Thailand to Stabilise Wellbore: A Case Study
Authors: Sukarasep Waleepon , Sukanta Dey Rahul , Phonpuntin Visarut
Published: June 2021

Sodium Silicate were first used in water-based drilling fluids to stabilize claystone formations in the 1930's, but found favour in the 1990's in high performance, non dispersed water based systems for drilling problematic claystone formations as an alternative to oil-based drilling fluids. In Bongkot South field, Gulf of Thailand, sodium silicate-based drilling fluid (SSBDF) were used with mixed success in shallow gas drilling. Typically, platform WP-33, the claystone formation of the 12¼" section were drilled with 5% v/v Sodium Silicate in the water based drilling fluid together with excessive circulation as intention to improve hole cleaning frequently result in a wellbore that was overgauge by upto 18.9% in some case. This led to further hole cleaning problem that also compromised cement job quality.

A further 6 well campaign on WPS-16 required a re-evaulation of the SSBDF coupled to an understanding of the wellbore instability mechanisms that leads to hole enlargement. To overcome better wellbore stability, sodium silicate has been designed by increased concentration to 8% v/v sodium silicate treated drilling fluid showed optimal design for application base on application of SSBDF has been used on platform WP-11 in 2002. Rheology, hydraulic and flow regime was adjusted for laminar flow that reduced the erosion of fragile claystone formation in the wellbore.

The revised SSBDF formulation at WPS-16 result in a significant reduction of hole enlargement to 3.2% in the claystone section through a combination of chemicals and mechanical inhibition that contribute improved hole cleaning. The addition of wellbore strengthening material also provide an effective seal to minimize gas invasion. This paper describes the field trials in the Gulf of Thailand drilled with revised sodium sodium silicate based drilling fluid, the use of wellbore strengthening materials to manage gas influxes, better drilling practice and hydraclic simulation concluded that high performance water based drilling fluid of this nature have wider application where oil-base drilling fluid have traditionally been used.
Application of Hydraulic Fracturing Candidate Selection Leading to Oil Production Boost from Multi-Layered, Low-Permeability Reservoirs: A Successful Case Study in Thailand
Authors: Wantawin Marut , Sirirattanachatchawan Thum , Suppachokinirun Theerapat , Hnuruang Kittithuch , Rongdechprateep Sorawee , Charoenniwesnukul Kritsada
Published: June 2021

Hydraulic fracturing activities implemented in Sirikit onshore oilfield of Thailand over a decade. Before 2018, the variation in post-fracturing production performance resulted in about 50% stimulation success rate. This outcome posted a big challenge to maintain project momentum. Hence, the candidate selection methodology was developed in-house which recommends "suitable" reservoirs. Using selection criteria, the multi-layered, low permeability reservoirs were selected for the 2018-19 Hydraulic Fracturing Campaign.

Production analysis was conducted using the information gathered from past hydraulic fracturing campaigns. Reservoir Index (RI) was invented to distinguish the subsurface quality by formation permeability, thickness, pressure, and fluid properties. Together with the Fold of Increase (FOI) owing to hydraulic fracturing, a performance-based relationship was created which can categorize suitable reservoirs based on their RI ranges. This method has been applied to newly drilled wells during 2018. In the end, there were 13 wells selected to perform 28 hydraulic fracturing stages.

The 2018-2019 Hydraulic Fracturing Campaign at Sirikit Oilfield was planned and executed. Post-fracturing production tests showing significant improvement. Some wells resulted in excellent oil production rate naturally, while some maintained high rate by artificial lift. According to post-campaign analysis, hydraulic fractures were proved to connect multiple layers of satisfactory flow capacity. In addition, well angle and stress direction accommodated the placement and orientation of multiple hydraulic fractures. As a result, the number of hydraulic fracturing stages that achieved economic production tests improved to 75% success rate.

Hydraulic fracturing results from the past were fully utilized in order to achieve sustainable production improvement, thus driving continuous stimulation activities in the future. The candidate selection methodology has shaped up a candidate selection workflow that pointed out success criteria and avoided those that may lead to failure, which proved to be successful in one of the most complex fields in Thailand.
Hybrid Bit Technology Deployment Yields Breakthrough Drilling Performance & Cost Savings for Operator
Authors: Al-Salah Fawaz , Al-Mejmed Saad , Abdelhamid Atef , Alnemer Ali , Gada Tahir , Pandya Mehul
Published: June 2021

Optimized drilling performance and minimized cost per well are key objectives for operators in the current challenging oil and gas industry. The process of collecting lessons learned and designing new drill bit technologies based on these learnings is critical for optimizing drilling performance and reducing non-productive time (NPT). Southeast Kuwait onshore wells are drilled with conventional drill bit technology such as tungsten carbide insert (TCI) and polycrystalline diamond compact (PDC) bits on rotary or directional-motor bottom hole assemblies (BHA). This paper discusses the analysis that enabled breakthrough-drilling performance of 16-in. hybrid drill bit technology, delivering outstanding results and cost savings for an operator.

The non-homogeneous carbonate formation in these onshore wells cause impact damage, limit the drilling efficiency of PDC and TCI bits, and result in a low rate of penetration (ROP) and poor dull conditions. A collaborative technical analysis identified key performance objectives to ensure a step change in section drilling performance.

The analysis involved reviewing:

Post-run dull conditions Operating parameters Formation compressive strengths Bit design Previous deployments results

On Multiple wells, advanced hybrid bit technology and optimized drilling methods achieved outstanding 73-percent improvement in ROP over conventional technologies, saving operator's 3.8 drilling days and more than 27% of drilling costs. The hybrid design completed two consecutive best in class (BIC) wells in southeast Kuwait compared with the typical TCI performance of a single well per bit.
The Modified Configuration of Wet Wash System in the Gulf of Thailand
Authors: Sumitra Khemchad , Fernau Marty , Thanomkiat Karn , Ritcey Joseph , Tumtong Chadchai
Published: June 2021

"Wet Wash" is a concept whereby cuttings are fluidized then sent to centrifuges to seperate the fluids from the cuttings. A modified configuration of this Wet Wash system improves fluids performance while minimizing environmental impact and optimizing operating costs.

The original Wet Wash system, introduced in 2006, started at the shale shakers where big cuttings were removed by the scalping deck and diverted overboard. Only the small cuttings from the primary deck were fluidized and transported to a big bowl centrifuge. For the original system, the % Synthetic on Cuttings (SOC) for this process was always over 8.0%. The system was unable to lower the SOC due to concerns for the capability of the big bowl centrifuge to handle big cuttings. With a modified centrifuge unit, a more robust unit with a design change in feed nozzles being able to handle more torque, all cuttings from both scalping deck and primary deck are fluidized and transported to a big bowl centrifuge with no big cuttings diverted overboard.

Utilizing the previous configuration of Wet Wash whereby cuttings from the scalper deck were diverted overboard, the % SOC was always over 8.0%. It was efficient in the removal of solids, but it was still yielding high SOC. In 2012 the use of Cuttings Dryers was introduced to further reduce % SOC. On Jack-up rigs, the Cuttings Dryer can operate in a normal manner, but on Tender Assisted rigs, where the cuttings are fluidized and pumped to the Dryer, there is a trade-off. High content of Low Gravity Solids (LGS) from the continual grinding of the solids to ultrafine particles that could not be removed by centrifuges had become an issue. High dilution rates were required to keep mud system under control due to excessive ultrafine solids.

The Wet Wash system was re-visited for Tender Assisted rigs. With the modified configuration of Wet Wash system where no cuttings were diverted overboard, fluids performance was improved from reduction of ultrafine solids contamination in the mud system, resulting in less dilution rate and mud chemicals treatment. The % SOC was also lower than 8.0%. With proper Preventative Maintenance (PM) program in place, there was neither down time of the centrifuge nor report of excessive wear of equipment from handling big cuttings.

The novelty of the modified Wet Wash configuration is in the ability to improve fluids performance and reduce environmental impact with the optimum operating cost.
Unlock Mono-Trip Gas Lift Completions Limits by using a New Cement-Through Packer and a Sliding Sleeve with Radio Frequency Identification Capability
Authors: Hanjawanich Siriwat , Shelby Taylor , Laonakornthum Kanin , Murdoch Euan , Piemchaw Kanokkorn , Tawatchai Duangkaewwutthikrai Tawatchai , Teerasukakul Wantanee
Published: June 2021

Gas lift is one of the most appropriate artificial lift methods for Gulf of Thailand (GOT) oil operations. As first described in Chapman, W. R. (2005), Mono-trip gas lift (MTGL) completions have continuously improved since their implementation in the early 2000s, increasing recovery by over 15%. MTGL completions enable marginal or sub-economic new wellhead platforms (WHPs) or infill projects to become economical. To overcome the more challenging wellbore environment in which the current technology is unable to be utilized, alternative technology was trialed in 2019 to enhance the MTGL completion without sacrificing the wellbore designs or reserves.
Lessons Learned from the First Chemical Sand Consolidation in Zawtika Field
Authors: Wiwatanapataphee Wiwat , Kiatrabile Thanita , Lilaprathuang Pipat , Nopsiri Noppanan , Kritsanamontri Panyawadee
Published: June 2021

The conventional gravel pack sand control completion (High Rate Water Pack / Extension Pack) was the primary sand control method for PTTEPI, Myanmar Zawtika field since 2014 for more than 80 wells. Although the completion cost of gravel pack sand control was dramatically reduced around 75 percent due to the operation performance improvement along 5 years, the further cost reduction still mandatory to make the future development phase feasible.

In order to tackle the well economy challenge, several alternative sand control completion designs were reviewed with the existing Zawtika subsurface information. The Chemical Sand Consolidation (CSC) or resin which is cost-effective method to control the sand production with injected chemicals is selected to be tested in 3 candidate wells. Therefore, the first trial campaign of CSC was performed with the Coiled Tubing Unit (CTU) in March to May 2019 with positive campaign results. The operation program and lesson learned were captured in this paper for future improvement in term of well candidate selection, operation planning and execution.

The three monobore completion wells were treated with the CSC. The results positively showed that the higher sand-free rates can be achieved. The operation steps consist of 1) Perform sand cleanout to existing perforation interval or perforate the new formation interval. 2) Pumping pre-flush chemical to conditioning the formation to accept the resin 3) Pumping resin to coating on formation grain sand 4) Pumping the post-flush chemical to remove an excess resin from sand 5) Shut in the well to wait for resin curing before open back to production. However, throughout the campaign, there were several lessons learned, which will be required for future cost and time optimization. In operational view, the proper candidate selection shall avoid operational difficulties e.g. available rathole. As well, detailed operation plan and job design will result in effective CSC jobs. For instance, the coil tubing packer is suggested for better resin placement in the formation. Moreover, accommodation arrangement (either barge or additional vessel) and logistics management still have room for improvement.

These 3 wells are the evidences of the successful applications in Zawtika field. With good planning, lesson learned and further optimization, this CSC method can be beneficial for existing monobore wells, which required sand control and also will be the alternative sand control method for upcoming development phases. This CSC will be able to increase project economic and also unlock the marginal reservoirs those will not justify the higher cost of conventional gravel pack.