bluuebunny/crossref_metadata_2025 huggingface dataset:
Cemented Mortar Matrices Densified with Organic Additions
Authors: Velázquez Luis Colín , Guzmán Elia Mercedes Alonso , Molina Wilfrido Martínez , Chávez-García Hugo Luis , Chiquito Maybelin Carolina García , Sánchez Mauricio Arreola
Published: May 2020

Nowadays, one of the biggest problems is the environmental contamination, which is attributed to a great variety of factors, among which is the construction, because one of the main synthetic materials most used is concrete, artificial material consisting of portland cement, fine aggregates, coarse aggregates and water, in the production and processing of portland cement a large amount of carbon dioxide (CO2) is generated, by 2018 approximately 8% of CO2 emissions from the world is attributed to the cement industry. As a solution to this problem, substitutions and additions to portland cement are proposed, which will generate a reduction in consumption and processing by having a more durable and better quality material in terms of physical and mechanical characteristics. Additions of 2% are made with respect to the weight of the cement of organic additions, which do not affect the behavior of the mortar. Cubic specimens were developed for tests of pulse velocity, compressive stress and accelerated attack of sodium sulfate to determine the durability of the material, where favorable results were obtained with organic addition of corn starch.
Potential Activity Evaluation of Phosphorus on CoMo/Al2O3-TiO2 Catalysts to Co-Processing Model
Authors: Rodseanglung Thirada , Paksamut Jitracha
Published: May 2020

The Co-Processing Model consist of the hydrodeoxygenation (HDO) of guaiacol compound was represented of bio-oil model and the hydrodenitrogenation (HDN) of quinolone compound was represented petroleum model, were investigated in tetralin at 300 °C under pressure of hydrogen 50 bar with the CoMoP sulfided supported on Al2O3-TiO2 catalyst and without phosphorus (P), the potential activity evaluation was compared with commercial catalysts. The liquid products after reaction were characterized by GC/MS. The CMAT, 0.5PCMAT and 1PCMAT catalysts proved to be effective for hydrodeoxygenation of guaiacol leading to significantly increased percentage of HDO, there are presence the %HDO as 57.93, 58.33 and 58.94 respectively, whereas the commercial catalysts showed the % HDO in range as 28-30%, while 2PCMAT catalysts showed the activity was less in HDO of guaiacol than other synthesized catalysts but showed high activity more than the commercial catalysts. Additionally, the HDN activity of CMAT catalyst showed that were improved, especially the phosphorus adding to CMAT present were high activity, due to the effects of the phosphorus as the catalyst promoter result to change of their morphologies and increase in Mo dispersion and increase in stacking of MoS2 crystallites, involve the formation of new acid sites on the catalyst surface.
Investigation of the Tensile and Flexural Behavior of Polylactic Acid Based Jute Fiber Bio Composite
Authors: Aadithya M. , Kirubakar V.K. , Aakash T. , Senthamaraikannan Chinnasamy
Published: May 2020

The main objective of this investigation is to reduce and eventually replace the use of non-biodegradable synthetic fiber. Bio composites have shown growth and has been used in the domestic sector, aerospace industry, circuit boards, and automotive applications over the past few years. Many types of natural fibres have been investigated to produce composite materials that are competitive with synthetic fibre composites. Jute is a natural fibre and is 100% bio-degradable and recyclable and thus environmentally friendly. Its properties include high tensile strength, low extensibility. This bio composite specimen has been fabricated with the help of hot press molding machine. The flexural and Tensile tests have been done according to the ASTM standards. The increasing awareness of global environmental and social concern and new environmental regulations have propelled the search for new composites that are compatible with the environment.
Fatigue-Corrosion of High Strength Steels in Synthetic Seawater under Cathodic Protection
Authors: Lorenzi Sergio , Testa Cristian , Cabrini Marina , Carugo Francesco , Coppola Luigi , Pastore Tommaso
Published: May 2020

The paper is aimed to the study of the corrosion-fatigue behavior of high strength steels for offshore pipelines. Tests have been performed in order to study fatigue crack growth in synthetic seawater under cathodic protection. The tests have been carried out on three different steel grades from 65 to 85 ksi with tempered martensite and ferrite-bainite microstructures. The effect of stress intensity factor, cathodic protection potential and cyclic loading frequency is shown.
Effect of Plating Thickness on Fatigue Strength of Galvanized Steel
Authors: Hasegawa Kayo , Hayashi Tatsuo , Morita Motoaki , Motoda Shinichi
Published: May 2020

Effect of the plating thicknesses on tensile and fatigue properties of hot-dip galvanized steel at room temperature was evaluated. The galvanized steel with thickness of 100 μm and 200 μm were prepared. Both microstructures of η-phase and δ1-phase were similar with each other. In the comparison with the galvanized steel with thickness of 100 μm, the microstructure of ζ-phase for the galvanized steel with thickness of 200 μm was blunt columnar structure due to long immersion time. Tensile and fatigue strengths for a galvanized steel are sensitive to the microstructure of the galvanized layer. The tensile strength and the strength of fatigue limit for the galvanized steel with thickness of 200 μm were smaller than that of 100 μm. In the galvanized steel with thickness of 200 μm, the peeling at plating layer easily occurred. The exfoliated sites have the potential to become subcracks. As the result, the main crack may propagate at early cycles.
Study of Deep Cryogenic Treatment Process Effect on Microstructure and Properties of CuBeZr Alloy
Authors: Wannaprawat Nuwan , Tuchinda Karuna
Published: May 2020

The aim of this research was study the influence of the Deep Cryogenic Treatment (DCT) on the microstructure transformation and materials properties of beryllium copper alloy (CuBeZr alloy). Microstructure analysis such as size, shape and number of precipitates were studied by Optical microscopy (OM) and Scanning Electron Microscopy (SEM). Microstructure analysis showed that transformation into the rod shape precipitates appeared after the process. The dispersion of CuNi precipitates and CuNiZr precipitates in the ⍺ matrix after deep cryogenic treatment was found to be increased. The change in number of CuNi precipitates and CuNiZr precipitates led to an increase in hardness and wear resistance. The maximum increase in hardness of 11% was observed with 48 hours soaking time with a reduction in surface wear of approx. 60%.
Casting of High Aluminum Content AM Series Magnesium Alloys by Using a Horizontal Twin Roll Caster
Authors: Tozuka Hotaka , Seki Kanae , Watari Hisaki , Haga Toshio
Published: May 2020

In this paper, twin roll casting of magnesium alloys with high aluminum content such as, Mg-11 mass%Al-0.2 mass%Mn, Mg-12 mass%Al-0.2 mass%Mn, Mg-13 mass%Al-0.2 mass% have been performed for the purpose of use as an original material for hot forging. Also the mechanical properties of the cast materials were examined. A 10 miri-meters thick strip was cast by the use of a horizontal twin roll caster. The microscopic observation was conducted to investigate into the precipitation of the metal compounds such as Mg17Al12, and the Vickers hardness of the cast strips test were performed. From the result of the roll casting experiments, a 10 mm thick strip was continuously cast at a roll speed of 3.1 m/min. The average grain size of the casting strips was about 46 micron meters. When the aluminum content was 13%, the hardness of the twin roll cast (TRC) strips became 1.7 times higher than that of extruded AZ 31. Also, a uniaxial compression test at elevated temperature was conducted to obtain a true strain-true stress curve for examining possibility of direct hot forging (DHF) of TRC magnesium alloys with high aluminum content.
3D FEM Study of the Flow Uniformity of Flat Polypropylene Film/Sheet Extrusion Dies
Authors: Igali Dastan , Perveen Asma , Wei Dong Ming , Zhang Di Chuan , Mentbayeva Almagul
Published: May 2020

Coat-hanger dies are widely used in the extrusion of polymer sheets and films. However, when designing the flat film/sheet extrusion dies manufacturing companies still facing difficulties in achieving the flow uniformity of the polymer melt. This affects the product quality and tool life. This study examines the existing extrusion die design which is used in in the industry in Kazakhstan for polypropylene sheet production and proposes better geometry of a die. These die geometries will be tested for flow uniformity in terms of velocity and pressure at the outlet.
Feasibility of Paper Production from Oil Palm Trunk Using Arrowroot Flour as a Binder
Authors: Phruksaphithak Nantharat , Wangprayot Jutarat
Published: May 2020

Oil palm trunk is lignocellulose biomass and agricultural residual waste that has not been utilized to its maximum potential. The feasibility of paper production from oil palm trunk (OPT) was studied for one alternative application. OPT was treated with 8% (w/v) alkaline solution (NaOH), subsequently with a different concentration of H2O2 solution (2, 4, 6 and 8% w/v). The results showed that the brown color of OPP was converted to a pale yellow color after bleaching with H2O2 while hemicellulose and lignin were also removed. Arrowroot flour was used as a binder for mold oil palm paper. The optimum condition for oil palm paper production was 15% (w/v) NaOH for 60 min then 6 % (v/v) H2O2 for 30 min. The obtained OPP paper showed a density of 183.53 ± 1.86 g/cm3, a water absorption of 0.0904 ± 0.0010 mL/cm2, a tensile index of 2.60 ± 0.07 Nm/g and a burst index of 1.22 ± 0.04 kPa m2/g. All value properties of the obtained OPP paper showed that the OPP value was lower than that of available commercial Kraft paper (KI125 and KT125). Meanwhile, this OPP paper process could continuously improve to be a container formation.
Tensile Properties of Cellulose-Filled Recycled Thermoplastic Composite Filaments for 3D Printing
Authors: Hyvärinen Marko , Kärki Timo
Published: May 2020

In recent years, the growing interest in the development of 3D printing has focused more specifically on the utilization of eco-friendly, biodegradable and recycled materials. This paper presents the effect of the addition of cellulose filler on the tensile properties of filaments used in 3D printing. Cellulose-filled thermoplastic composite filaments were extruded from virgin polylactic acid (PLA), recycled acrylonitrile butadiene styrene (ABS), polystyrene (PS), and polyvinylchloride (PVC), and the effect of cellulose filler on the tensile properties of composite filaments was measured. The results revealed that the tensile properties of recycled thermoplastic filaments weakened remarkably whereas the tensile properties of the filament made of virgin PLA slightly improved. However, despite the differences in the results, it was found that cellulose-filled thermoplastic composite filaments can be produced as feedstock used in 3D printing.
Hazard Data Analysis for Underwater Vehicles by Submarine Casualties
Authors: Chen Tim , Morozov Stepan Nikolaevich , Chen C.Y.J.
Published: May 2020

Retraction NoticeThe Marine Technology Society Journal was contacted in April 2022 pointing to major concerns, including forged affiliations, related to this publication. The claimant noted the unethical practice of these two authors has been reported in
relation to 60+ articles published in more than one dozen other journals. Recently, these authors plausibly changed their
forenames/first names to repeat similar misconducts.
In the paper 'Hazard Data Analysis for Underwater Vehicles by Submarine Casualties' doi: 10.4031/mtsj.53.6.2, the
affiliation of the author CYJ Chen to NAAM Research Group, King Abdulaziz University Saudi Arabia, is false. This
university did not employ CYJ Chen between 2018 and 2021.
Additionally, the second author by the name of Stepan Nikolaevich Morozov is listed as affiliated with the Faculty
of Mathematics and Mechanics at St. Petersburg State University. No person of that name is or has been listed as a
faculty member of that institution and that name is affiliated with no other published paper than this one. It is our
understanding that this author does not exist.
Coastal Marine Automated Observing Station in China
Authors: Wang Yi , Qiu Wen-bo , Gao Yan-bo
Published: May 2020

AbstractThe coastal marine automated observing station (CMAOS) is a facility built on the coast or island, collecting time series of ocean environment variables such as marine hydrological and meteorological parameters. This article introduces the general progress of CMAOS
in China. The greatest demand for CMAOS is marine disaster forecasting and early warning to assist decision making and to protect the marine ecological environment. After more than half a century's efforts, China has established a network of CMAOS covering the coastal areas of China, which
in real time acquires marine environmental information. The core of CMAOS is the marine automated observing system (MAOS), which integrates ocean sensors, a data collector, and a data reception processor. Currently, the MAOS is in its third generation of development and will follow the trend
of unmanned, intelligent, and multifunctional systems. With the continuous implementation of relevant planning of an ocean observing network in China, the layout of CMAOS will be further optimized, the observed parameters will be more comprehensive, and the measuring means will be more abundant.
Design Considerations for Strategic Autonomous Underwater Swarm Robotic Systems
Authors: Vedachalam Narayanaswamy , Ramesh Raju , Jyothi Vandavasi Bala Naga , Prakash Vittal Doss , Ramadass Gidugu Ananda , Atmanand Malayath Aravindakshan
Published: May 2020

AbstractAutonomous underwater swarm robotic systems (AU-SRS) are vital for exploration of the vast marine resources, spatio-temporal monitoring of the oceans for understanding the changing climate patterns, marine pollution monitoring, defense, and identification of assets
lost in the oceans. The paper summarizes the technological developments in the autonomous underwater vehicles hitherto and discusses the design requirements for next-generation intelligent AU-SRS including intra-vehicle intelligence, inter-vehicle communication, intervention capability, swarm
algorithms, and bio-inspired designs. The importance of quality-centered system engineering is also detailed.
Sensitivity and specificity of malaria rapid diagnostic test (mRDT CareStatTM) compared with microscopy amongst under five children attending a primary care clinic in southern Nigeria
Authors: Ogunfowokan Oluwagbenga , Ogunfowokan Bamidele A. , Nwajei Anthony I.
Published: May 2020

Background: Malaria diagnosis using microscopy is currently the gold standard. However, malaria rapid diagnostic tests (mRDTs) were developed to simplify the diagnosis in regions without access to functional microscopy.Aim: The objective of this study was to compare the diagnostic accuracy of mRDT CareStatTM with microscopy.Setting: This study was conducted in the paediatric primary care clinic of the Federal Medical Centre, Asaba, Nigeria.Methods: A cross-sectional study for diagnostic accuracy was conducted from May 2016 to October 2016. Ninety-eight participants were involved to obtain a precision of 5%, sensitivity of mRDT CareStatTM of 95% from published work and 95% level of confidence after adjusting for 20% non-response rate or missing data. Consecutive participants were tested using both microscopy and mRDT. The results were analysed using EPI Info Version 7.Results: A total of 98 children aged 3–59 months were enrolled. Malaria prevalence was found to be 53% (95% confidence interval [CI] = 46% – 60%), whilst sensitivity and specificity were 29% (95% CI = 20% – 38%) and 89% (95% CI = 83% – 95%), respectively. The positive and negative predictive values were 75% (95% CI = 66.4% – 83.6%) and 53% (95% CI = 46% – 60%), respectively.Conclusion: Agreement between malaria parasitaemia using microscopy and mRDT positivity increased with increase in the parasite density. The mRDT might be negative when malaria parasite density using microscopy is low.
Dynamics of prices and consumption of unhealthy foods as a monitoring tool of the strategy against obesity in Mexico
Authors: Lozano-Díez José-Antonio , Rodríguez-Aguilar Román
Published: May 2020

INTRODUCTION: Mexico faces an epidemic of overweight and obesity, in 2018 75% of adults were overweight or obese. This condition as a risk factor generates a significant financial impact in the Health Sector. In response, the National Strategy for Prevention and Control of Overweight, Obesity, and Diabetes was implemented in 2013, which included as one of its pillars the implementation of fiscal policies. As part of fiscal policy, taxes were established on sugary drinks and foods with high-calorie content. Seven years after the implementation of the Strategy to control the epidemic of overweight and obesity, there have been some results. However, it is necessary to continue working and especially monitoring the performance of the different actions implemented.OBJECTIVES: Propose an analytical intelligence model for monitoring the fiscal policies implemented to control overweight and obesity in Mexico.METHODS: The proposed analytical intelligence model considers three methodological bases, a) price index of healthy and unhealthy foods through Principal Component Analysis, b) volatility measurement of both baskets through a GARCH model and c) monitoring of consumption patterns through household income and expenditure surveys.RESULTS: The main results identified a price differential between the baskets of products healthy and unhealthy, especially at the beginning of the fiscal policy. Healthy products have higher price volatility than unhealthy products and according to consumption patterns, on average Mexican households spend 30% of their food expenditure on unhealthy products.CONCLUSION: To strengthen fiscal actions to control overweight and obesity, it is recommended to have monitoring systems for the dynamic design and implementation of public policies. Although taxes have reduced in some grade the consumption of unhealthy products, it is necessary to promote the affordability of healthy products, helping to improve the diet of Mexican households.
Building DEM for deep open-pit coal mines using DJI Inspire 2
Authors: Nghia Nguyen Viet ,   Faculty of Geomatics and Land Administration, Hanoi University of Mining and Geology, Vietnam
Published: May 2020

Using photo data of unmanned aerial vehicle (UAV) for building 3D models has been widely used in recent years. However, building a 3D model for deep open - pit coal mines with the mean height difference between surface and bottom of mines to over 500 m, there has not been researched mentioned. The paper deals with the assessment possibility of developing 3D models for deep open - pit mines from UAV image data. To accomplish this goal, DJI's Inspire 2 flying device is used to take the photo at Coc Sau coal mine. The flying area is 4 km2, the flight altitude compared to the takeoff point on the mine surface is 250 m, the overlaying coverage is both horizontal and vertical is 70%. The average errors of the horizontal and height elements of the reference points photo correlates are 0.011 m, 0.017 m, 0.016 m, 0.049 m, and 0.051 m. The maximum error on the X-axis is - 0,025 m, and the Y-axis is 0.028 m, the maximum horizontal error is 0.034 m, the maximum error on the Z-axis is 0.095 m, and the position error is 0.095 m. These results show that the 3D model established from photographic data by Inspire 2 device has satisfied the requirements of the accuracy of establishing the mining terrain map 1: 1000 scale.
Quality characteristics of Ilmenit minerals in the south central of Vietnam by SEM and QEMSCAN analysis
Authors: Hiep Nguyen Huu , Carter Andrew , Din Dao Bui , Luc Trinh The , Chi Ngo Thi Kim , Dao Vu Anh , Binh Phan Van , Huy Nguyen Quang ,   Center for Excellence in Analysis and Experiment, Hanoi University of Mining and Geology, Vietnam;  Geology Falcuty, Hanoi University of Mining and Geology, VietNam ;  Department of Earth and Planetary Sciences, Birkbeck University of London, U.K;  Office of Ministry of Natural Resources and Environment;  Northwest Geological Division, General Department of Geology and Minerals of  Vietnam
Published: May 2020

Placer deposit along the South Central Coast of Viet Nam is formed by the enrichment of heavy minerals through a combination of transportation, weathering, erosion and deposition processes. Ilmenite placer forms continuously along the South Central Coast from local origin when the shoreline is far from the modern shoreline formed during the marine transgression process from the late Plestocene to Holocene. The morphological and localization characteristics of Ilmenite have been clarified on the distribution trend with SEM method combined with QEMSCAN. Meticulous research on Ilmenite's grain structure and chemical composition in the study area has shown a tendency to significantly enrich the quality of Ti placer according to the upward trend in the north-south direction. In the south, the Ilmenite placer has smaller particle size but better selective roundness and better quality than in the northern part of the study area. The enrichment of TiO2 content with increasing trend from North to South was observed due to the strong weathering process associated with ancient coastline which is very far away from current shoreline so heavy minerals are accumulates locally and light minerals are carried away. The southern region of the South Central Coast region is home to the highest gap between the ancient shoreline and the current coastline. This study has shown the trend of the quality distribution of Ilmenite as well as of other heavy minerals as the basis for future mineral exploration planning.
Utilisation of ground granulated blast furnace slag (GGBFS) for soft soil improvement by deep mixing method
Authors: Nu Nguyen Thi , Son Bui Truong , Hai Pham Van ,   Faculty of Geosciences and Geoengineering, Hanoi University of Mining and Geology, Vietnam
Published: May 2020

Ground granulated blast furnace slag (GGBFS) is the by-products from pig iron plants which can cause a serious problem for land, soil, and water. Thus, the study for reusing GGBFS is very nessesary. This paper presents the utilisation of GGBFS for soft soil improvement by cement deep mixing method. Portland cement was replaced by GGBFS from 0 to 100% and a total of 33 specimens were used to determine the unconfined compressive strength and deformation modulus of treated soil. The experimental results showed that replacement of GGBFS from 0 to 60% cement could increase the unconfined compressive strength and deformation modulus of treated soil. The optimum GGBFS content was found to be 30% of cement content. In general, the utilisation of GGBFS for soil improvement could increase the properies of soft soil and soil treated with cement. The result of this study will be basic for utilisation of GGBFS in ground improvement by cement deep mixing method.
Clarifying Capacity of Eco-Friendly Nano Cao and Okra(AbelmoschusEsculentus) Extract on the Processing of Sugarcane Juice: A Review
Authors: Mading Makur Majur , Duraisamy Ramesh , Birhanu Tewodros
Published: May 2020

Sugar cane is the raw material for sugar factories worldwide that amount to about 70% of both refined and raw sugars with only 30% of sugar from sugar beets. The cane or beets are crushed in the factory to extract juice using crushers and millers. The extracted juice is clarified to remove impurities and raise the pH. The important point of clarificant is to produce clear Juice with the lowest or null concentration of insoluble and soluble impurities to achieve maximum sugar yield Chemicals like calcium oxide, CO2, SO2 which are aided with polyamines, bentonite, separanAp 30 and hodag flocculants of high molecular weight polyacrylamide polymer are used to help improve color that is one of the most important parameters in raw sugar quality. The use of SO2 is discouraged by many countries because of the risk involved with residue in sugar and its importation together with CaO which enforced additional funding on manufacturers. However, chemicals used for clarification are expensive and caused environmental problems in areas around the sugar industry. Therefore, nano and vegetative clarificants were considered as potential clarifier by producers of raw sugar and jaggery and even in water treatment. Also, nanotechnology was reported to have worked well in the treatment of waste water and in food industries to detect chemicals and remove biological substances.
A Review on the Investigation of Biologically Active Natural Compounds on Cotton Fabrics as an Antibacterial Textile Finishing
Authors: John Unango Franco , M Ramasamy Karthikeyan
Published: May 2020

The scientific studies have considered the propolis, beewax and Chitosan as antibacterial agents for 100% cotton fabrics in recent years as an emulsion to functionalize cotton textile materials. But yet no more research had done on these natural compounds. Chitosan has a long historical background of being used as an antibacterial agent in different fields. The concentration, Molecular Weight, and Degree of Deacylation of chitosan and the bacterial strain are the main factors that affect the antibacterial behavior of chitosan. The used of chitosan as an antibacterial finish along with a durable press finishing agent on 100% cotton fabrics was found that antibacterial activity remained to a level of 80% after 10 repeated launders. The presence of the biologically active natural compounds on the cotton substrates modified the surface of the textile fibers. The treatment also improved fabric comfort properties, the cotton substrates became less air permissive and more hygroscopic after the treatment. The research found that the treated cotton fabric showed higher reduction (97%) in the number of colonies of S. aureus bacteria compared to the number of colonies on a 55/45% wood pulp/polyester spun-laced nonwoven fabric.The antibacterial performance of the functionalized cotton fabrics treated with those biologically active natural compounds has the potentials to be used in medical fields[1]. Furthermore, the used of microcapsules of honey as core and chitosan as a shield on the medical gauzes showed good performance in the wound healing. These treated medical gauzes have the healing and antimicrobial behaviors of honey and chitozan and that study had proved the usage of honey and Chitosan as an antibacterial in treating medical gauzes for the human diabetes [2]. Up to date none of the natural compounds have been reported to have negative side effects on the human skin when used as antibacterial clothing.
On domains witnessing increase in information
Authors: Spreen Dieter
Published: May 2020

The paper considers algebraic directed-complete partial orders with a semi-regular Scott topology, called regular domains. As is well know, the category of Scott domains and continuous maps is Cartesian closed. This is no longer true, if the domains are required to be regular. Two Cartesian closed subcategories of the regular Scott domains are exhibited: regular dI-domains with stable maps and strongly regular Scott domains with continuous maps. Here a Scott domains is strongly regular if all of its compact open subsets are regular open. In one considers only embeddings of dependent products and sums. Moreover, they are w-cocomplete and their object classes are closed under several constructions used in programming language semantics. It follows that recursive domains equations can be solved and models of typed and untyped lambda calculi can be constructed. Both kinds of domains can be udes in giving meaning to programming language constructs.
La acción transformadora de los trabajos de investigación para la consecución de los Objetivos del Desarrollo Sostenible: Estudio de las letras de las canciones de reguetón en el marco de la igualdad de género en una actividad extraescolar
Authors: Menoyo Díaz María del Pilar
Published: May 2020

Una educación de calidad que fomente sensibilice y capacite para que sea posible el cumplimiento de los ODS requiereuna pedagogía transformadora, orientada a la acción, promoviendo tanto el aprendizaje autónomo como el colaborativo, la mirada crítica de la realidad y laorientación parala resolución de problemas en un marco interdisciplinar, ya seaen aprendizaje formal ono formal.

Una manera de favorecer la equidad educativa más allá de los centros, en un marco de “Educación 360º”, son las actividades extraescolares de calidad para todos. Con este convencimiento dinamizo una actividad extraescolar voluntaria, gratuita y no remunerada para que alumnado de Secundaria aprenda a investigar investigando y, por tanto, desarrollen competencias útiles para toda la vida, contribuyendo a su vez a la consecución de los ODS.
Investigar es una manera de mirar y ver, depensar y actuar, y, como ejemplo,presento un trabajorealizadopor dos alumnas de 3º de ESO cuyamirada curiosa y críticahacia el contenido de las letras de las canciones de reguetón se materializó en una investigación sobre la igualdad de género (ODS 5), la cual se presentó en la muestra “XXI Exporecerca”, obteniendo dos primeros premios, el Exporecerca y Obra Social La Caixa.
Trabajo en red como metodología de intervención con la infancia y adolescencia: claves para su consolidación
Authors: Martínez Virto Lucía , Azcona Martinez Amaia
Published: May 2020

La promoción del buen trato a la infancia y adolescencia es clave para el presente y futuro de nuestra sociedad. Su protección requiere la atención a casos en desprotección o conflicto, pero también la promoción de acciones preventivas. La familia, la comunidad, el centro educativo, de salud o servicios sociales son actores protagonistas en la atención a los niños, niñas y jóvenes. Su atención requiere una acción colaborativa y coordinada de trabajo con un enfoque compartido que contribuya a su bienestar integral. La metodología de trabajo en red cuenta ya con larga trayectoria en la intervención con la infancia y la adolescencia, pero ¿Cómo promoverla? ¿Quién debe liderarla? ¿Qué contenido trabajar? ¿Cómo consolidarla? Mediante un estudio basado en 5 experiencias de trabajo en red en Pamplona (Navarra), se identifican las principales potencialidades, limitaciones y retos actuales de esta metodología del trabajo. Los resultados permiten sistematizar estas experiencias, contribuir al aprendizaje entre territorios y aportar claves orientadas a la consolidación del trabajo en red como metodología de intervención con la infancia y adolescencia.
Influence of gravity wave temperature anomaly and its vertical
gradient on cirrus clouds in the tropical tropopause layer – a
satellite-based view
Authors: Chang Kai-Wei , L'Ecuyer Tristan
Published: May 2020

Abstract. Negative temperature perturbations (T′) from gravity waves are known to favor tropical tropopause layer (TTL) clouds, and recent studies have further suggested a possible role of dT′/dz on facilitating TTL cloud formation and maintenance. With a focus on exploring the influence of dT′/dz on TTL clouds, this study utilizes radio occultation temperature retrievals and cloud detection from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) to understand how gravity wave perturbations modulate cloud occurrence. Cloud populations were evaluated in four phases corresponding to positive or negative T′ and dT′/dz. We find that 57 % of TTL clouds are found where T′ and dT′/dz are both negative. Regions of frequent convection are associated with higher cloud populations in the warm phase T′>0. The partitioning of cloud population among wave phases shows some dependence on the background relative humidity estimated using Aura Microwave Limb Sounder water vapor retrievals. Using effective radius (re) retrievals from the CloudSat/CALIPSO 2C-ICE product, we find that re is distributed similarly among all wave phases but a smaller mode is found in the re distribution from the phase T′<0 and dT′/dz<0. It is shown that the strongest mean negative T′ anomaly is centered on the cloud top, resulting in positive dT′/dz above the cloud top and negative dT′/dz below. This negative T′ anomaly propagates downward with time consistent with upward propagating gravity waves. Negative (positive) T′ anomalies are associated with increased (decreased) probability of being occupied by clouds. The magnitude of T′ correlates with the increase or decrease in cloud occurrence, giving evidence that the wave amplitude influences the probability of cloud occurrence. While the decrease of cloud occurrence in the warm phase is centered on the altitude of T′ maxima, we show that the increase of cloud occurrence around T′ minima occurs below the minima in height, indicating that cloud formation or maintenance is facilitated mainly inside negative dT′/dz. Together with existing studies, our results suggest that the cold phase of gravity waves favor TTL clouds mainly through the region of wave anomalies where dT′/dz is negative.
Methane paradox in tropical lakes? Sedimentary fluxes rather than
water column production in oxic waters sustain methanotrophy and
emissions to the atmosphere
Authors: Morana Cédric , Bouillon Steven , Nolla-Ardèvol Vimac , Roland Fleur A. E. , Okello William , Descy Jean-Pierre , Nankabirwa Angela , Nabafu Erina , Springael Dirk , Borges Alberto V.
Published: May 2020

Abstract. Despite growing evidence that methane (CH4) formation could also occur in well-oxygenated surface freshwaters, its significance at the ecosystem scale is uncertain. Empirical models based on data gathered at high latitude predict that the contribution of oxic CH4 increases with lake size and should represent the majority of CH4 emissions in large lakes. However, such predictive models could not directly apply to tropical lakes which differ from their temperate counterparts in some fundamental characteristics, such as year-round elevated water temperature. We conducted stable isotope tracer experiments which revealed that oxic CH4 production is closely related to phytoplankton metabolism, and is a common feature in five contrasting African lakes. Nevertheless, methanotrophic activity in surface waters and CH4 emissions to the atmosphere were predominantly fuelled by CH4 generated in sediments and physically transported to the surface. Indeed, measured CH4 bubble dissolution flux and diffusive benthic CH4 flux were several orders of magnitude higher than CH4 production in surface waters. Microbial CH4 consumption dramatically decreased with increasing sunlight intensity, suggesting that the freshwater CH4 paradox might be also partly explained by photo-inhibition of CH4 oxidizers in the illuminated zone. Sunlight appeared as an overlooked but important factor determining the CH4 dynamics in surface waters, directly affecting its production by photoautotrophs and consumption by methanotrophs.
Using ambient noise tomography to image tectonic and magmatic features of the Irazú-Turrialba volcanic complex at regional and local scales
Authors: Jiwani-Brown Elliot Amir , Planes Thomas , Francisco Pacheco Javier , Mora Mauricio , Lupi Matteo
Published: May 2020

Passive seismology in volcanically active locations provides a valuable insight into the structural and evolutionary characteristics of subsurface magmatic features. The Irazú-Turrialba Volcanic Complex (ITVC) consists of a twin-system of volcanoes in Costa Rica, located at the south-eastern end of the Central American Volcanic Arc (CAVA). The ITVC represents a noticeable delineation of this subduction arc sequence, influenced by the formation of the Panama microplate and potentially driven by the Central Costa Rican Deformation belt (CCRDB). This volcanic arc is formed by the subduction of the Cocos Plate, beneath the Caribbean plate. This is an interesting twin-volcanic system consisting of the close-system of Irazú, and actively-venting open-system of Turrialba. Utilizing ambient noise tomography (ANT), 3D shear-wave velocity models are retrieved and compared to previously determined major tectonic features at both regional and local scales

 

Data were collected from 20 temporary broadband seismic stations, forming a network around the ITVC, and supplemented by 45 permanent stations from the regional networks (OVSICORI & RSN). We used the continuous noise readings from vertical components to compute cross-correlation functions. We then used Rayleigh wave group-velocity dispersion curves to perform an inversion to obtain 2D group velocity maps at both regional and local scales. A further inversion step was undertaken to obtain 3D shear-wave velocity models of the regional features of the Central American Volcanic Arc and more local-scale features of the plumbing system beneath the ITVC. Features determined in the inversions are compared to the literature-established, large-scale and local tectonic features, creating an image of the twin-system complex. In particular, we compare the subsurface magmatic features of the ITVC to establish the impact of local and regional faulting on the shape of the internal plumbing structure, and to determine whether ANT can effectively constrain these known tectonic features.

 

We establish an improved understanding of the ITVC whole-system plumbing, and the regional velocity anomalies attributed to other Costa Rican volcanic systems within the Central American Volcanic Arc and relation to the tectonics.
Quantification of seasonal and diurnal dynamics of subglacial channels using seismic observations on an Alpine glacier
Authors: Nanni Ugo , Gimbert Florent , Vincent Christian , Gräff Dominik , Walter Fabian , Piard Luc , Moreau Luc
Published: May 2020

Abstract. Water flowing below glaciers exerts a major control on glacier basal sliding. However, our knowledge of the physics of subglacial hydrology and its link with sliding is limited because of lacking observations. Here we use a 2-year-long dataset made of on-ice-measured seismic and in situ-measured glacier basal sliding speed on Glacier d'Argentière (French Alps) to investigate the physics of subglacial channels and its potential link with glacier basal sliding. Using dedicated theory and concomitant measurements of water discharge, we quantify temporal changes in channels' hydraulic radius and hydraulic pressure gradient. At seasonal timescales we find that hydraulic radius and hydraulic pressure gradient respectively exhibit a 2- and 6-fold increase from spring to summer, followed by comparable decrease towards autumn. At low discharge during the early and late melt season channels respond to changes in discharge mainly through changes in hydraulic radius, a regime that is consistent with predictions of channels' behaviour at equilibrium. In contrast, at high discharge and high short-term water-supply variability (summertime), channels undergo strong changes in hydraulic pressure gradient, a behaviour that is consistent with channels behaving out of equilibrium. This out-of-equilibrium regime is further supported by observations at the diurnal scale, which prove that channels pressurize in the morning and depressurize in the afternoon. During summer we also observe high and sustained basal sliding speed, which supports that the widespread inefficient drainage system (cavities) is likely pressurized concomitantly with the channel system. We propose that pressurized channels help sustain high pressure in cavities (and therefore high glacier sliding speed) through an efficient hydraulic connection between the two systems. The present findings provide an essential basis for testing the physics represented in subglacial hydrology and glacier sliding models.
Investigations of aerodynamic drag forces during structural blade testing using high-fidelity fluid–structure interaction
Authors: Grinderslev Christian , Belloni Federico , Horcas Sergio González , Sørensen Niels Nørmark
Published: May 2020

Abstract. Aerodynamic loads need to be known for planning and defining test loads beforehand for wind turbine blades that are tested for fatigue certifications. It is known that the aerodynamic forces, especially drag, are different for tests and operation, due to the entirely different flow conditions. In test facilities, a vibrating blade will move in and out of its own wake, increasing the drag forces on the blade. This is not the case in operation. To study this special aerodynamic condition present during experimental tests, numerical simulations of a wind turbine blade during pull–release tests were conducted. High-fidelity three-dimensional computational fluid dynamics methods were used throughout the simulations. In this way, the fluid mechanisms and their impact on the moving blade are clarified, and through the coupling with a structural solver, the fluid–structure interaction is studied. Results are compared to actual measurements from experimental tests, verifying the approach. It is found that the blade experiences a high drag due to its motion towards its own whirling wake, resulting in an effective drag coefficient of approximately 5.3 for the 90∘ angle of attack. This large drag coefficient was implemented in a fatigue test load simulation, resulting in a significant decrease in bending moment along the blade, leading to less load being applied than intended. The confinement from the test facility did not impact this specific test setup, but simulations with longer blades could possibly yield different conclusions. To the knowledge of the authors, this investigation, including three-dimensional effects, structural coupling and confinement, is the first of its kind.
A trilha musical de Moacir Santos para Os Fuzis no contexto das produções do Cinema Novo e a predominância do silêncio narrativo
Authors: Bonetti Lucas Zangirolami
Published: May 2020

O presente artigo estuda a trilha musical de Moacir Santos para o filme Os Fuzis por meio da análise musical e historiográfica. Para se alcançar esse objetivo, foram primeiramente contextualizadas as principais tendências da produção de trilhas musicais nos anos 1960 no Brasil, de modo a se traçar possíveis paralelos de entendimento. O tema principal do filme, que é efetivamente a única composição de Santos presente na trilha musical, foi transcrito em partitura e devidamente analisado. Além disso, também foram abordadas outras inserções musicais que não foram compostas por Santos, mas que passaram por seu crivo de diretor musical da produção. Por fim, foi de grande interesse para a pesquisa perceber o uso narrativo e estrutural do silêncio dentro da trilha sonora, dialogando com outros aspectos estéticos do filme, e se aproximando de outras produções do período.
Maturação de frutos e sementes de inhaíba (Lecythis lurida - Lecythidaceae)
Authors: Duarte Edson Ferreira , Almeida Daiane Sampaio , Santos Jaylson Araujo dos , Santos Carlos Henrique Barbosa , Azevedo Neto André Dias de , Cruz Claudineia Regina Pelacani , Peixoto Clovis Pereira
Published: May 2020

As espécies nativas carecem de informações sobre a maturação de seus frutos e sementes. Objetivou-se avaliar a maturação de frutos e sementes de inhaíba (Lecythis lurida). Fez-se a marcação de flores em antese e a posterior colheita de frutos e sementes após 1, 2, 3, 4 e 5 meses, quando foram analisados e feita a descrição morfológica. Aos 4 meses de idade, os frutos de semiglobosos passaram a ter o formato cilíndrico-comprimidos. As sementes apresentaram um arilo vestigial, além do tegumento inicialmente de cor bege e que tornou-se marrom a partir do terceiro mês. O embrião branco manteve-se envolto pelo endosperma e não apresentou diferenciação morfológica. O máximo desenvolvimento morfológico das sementes ocorreu aos 4 meses, quando apresentaram as maiores dimensões (50,9 x 50,8 x 43,3 mm), as máximas germinação (84,8%) e massa seca (32 g), a menor mortalidade das sementes (19%), caracterizando a maturidade fisiológica e o momento de colheita. Nesse momento, os teores de N P K eram menores que 5% e o amido tornou-se o componente predominante nas reservas (47,8% da massa seca). As sementes maduras representam mais de 50% da massa dos frutos e apresentam dormência embrionária e resistência tegumentar que atrasam a emergência das plântulas.
EFEITOS DAS MUDANÇAS DO USO E COBERTURA DA TERRA NOS PADRÕES DE PAISAGEM DA BACIA HIDROGRÁFICA DO ARROIO CAMBUÇU, RIO GRANDE DO SUL, BRASIL
Authors: Schafer Alexandro Gularte
Published: May 2020

O objetivo deste estudo foi mapear as mudanças que ocorreram no uso e cobertura da terra e avaliar a influencia destas mudanças nos padrões de paisagem na bacia hidrográfica do Arroio Cambuçu, entre 1985 e 2014. O Arroio Cambuçu está localizado no bioma pampa e é uma subbacia da bacia hidrográfica do Rio Negro, localizada no Rio Grande do Sul. Para reconstruir e analisar o processo de mudança no uso e cobertura da terra, bem como as mudanças nos padrões de paisagem foram utilizadas uma série temporal de imagens de satélite (1985, 1996, 2003 e 2014), modelos matemáticos e métricas. Os resultados indicam mudanças significativas no uso e cobertura da terra do Arroio Cambuçu nos últimos 29 anos. A diversidade da paisagem aumentou de 0,81 em 1985 para 1,01 em 2014. A dominância da paisagem diminuiu de 0,80 para 0,60. Portanto, houve uma redução das diferenças entre os padrões de paisagem. A fragmentação da paisagem aumentou entre 1985 e 2014. A taxa global de mudança do uso e cobertura da terra foi 0,31, indicando que essa mudança foi uma transição quasi balanced two-way. O aumento da atividade agrícola foi a principal causa das alterações no uso e cobertura da terra na área de estudo.
PLATAFORMA WEB PARA FOTOINTERPRETAÇÃO DE IMAGENS PANORÂMICAS AÉREAS E TERRESTRES
Authors: Faustino Fábio Júnio da Silva , Xavier Tandara Ketlyn Degobi , Ferreira Alan Icaro Santos
Published: May 2020

O presente trabalho teve como objetivo a criação de uma plataforma na rede mundial de computadores para o armazenamento e visualização de imagens panorâmicas aéreas e terrestres, pra fins de fotointerpretação. Dentre as opções de métodos de fotointerpretação têm-se a fotoleitura, fotoanálise e fotodedução e, dentre os elementos de fotointerpretação têm-se, por exemplo, o fator forma, cor, textura, tonalidade e contexto. Nesse escopo, as fotografias aéreas e terrestres foram obtidas em quantidades que permitissem a geração das imagens equirectangulares, que foram geradas mediante ao processamento das imagens originais no aplicativo computacional Autostitch. Na sequência, essas imagens foram carregadas em um servidor de hospedagem, local onde também foi armazenada a plataforma baseada no sistema de gerenciamento de conteúdo Wordpress. Utilizando o plugin Pannellum, as imagens panorâmicas puderam ser visualizadas no Wordpress e permanecer à disposição do público. Com as imagens disponíveis na plataforma, o que consequentemente gerou resultados, a plataforma se mostrou muito útil, já tendo sido utilizada em outros projetos de pesquisa para, por exemplo, a fotointerpretação dos indivíduos de um bosque dendrológico pertencente ao campus. Dessa forma, conclui-se que os resultados da pesquisa geraram informações que, mediante técnicas de fotointerpretação, podem complementar a disseminação de informações espaciais.