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Floods are among the most common natural disasters responsible for severe damages and human losses. Numerically produced data, managed by user-friendly tools for geographically referenced data, have been adopted to increase preparedness and reduce vulnerabilities. This paper describes the locally sensed and numerically produced data that characterize a flood event that occurred in February 2016 in the Portuguese Águeda River, referred to as Agueda.2016Flood for short. The data were managed through the RiverCure portal, a collaborative web platform connected to a validated shallow-water model featuring modelled dynamic bed geometries and sediment transport. The dataset provides a synthesis of topo-bathymetric, hydrometric and numerically produced data from a calibrated hydrodynamic model. Due to the lack of measured hydrometric data near the city, the numerically produced data are crucial for a complete description of the flood event. The Agueda.2016Flood dataset constitutes a complete validation test for flood forecasting models and a tool to better mitigate floods in this river and in similar rivers. Thus, Agueda.2016Flood is a relevant dataset for Águeda River stakeholders as well as for the community of flood modellers, as it provides a well-documented validation event for forecasting tools. The dataset can be accessed at https://doi.org/10.4211/hs.937927473a3a4e66a07a2e2fdd9d581e (Ricardo et al., 2024). more...

Introduction Wilson’s disease is a rare (1:30,000) autosomal recessive disorder of copper metabolism that is caused by mutations in the adenosine triphosphatase copper transporting beta (ATP7B) gene, located on chromosome 13. The reported percentage of patients with psychiatric symptoms as the presenting clinical feature is 10%-20%. Objectives To present and discuss a rare case admitted in the First Psychotic Episode Inpatient Unit (UIPEP) with pleiomorphic psychotic symptoms and low serum copper and ceruloplasmin and high 24h urine copper. Methods The data was collected through patient and family interviews, as well as from his medical record. We searched Pubmed using MeSH terms: psychotic disorders AND Hepatolenticular Degeneration. Results A twenty-two years old male, without known psychiatric history presented in the Emergency Department with a myriad of psychotic symptoms: motor stereotypes/mannerisms, paranoid delusions and auditory hallucinations. He was admitted in UIPEP, started low-dose antipsychotic medication with good response. As part of the implemented protocol, he did a battery of exams, including Brain CT-scan, EEG, ECG and blood and urine analysis, in which low serum copper and ceruloplasmin stood out, leveraging the suspicion of Wilson´s disease. Therefore, 24h urine copper was done, with 140 mcg/d (reference range < 40 mcg/d). Brain MRI was normal and no Kayser–Fleisher rings were seen by a consulting ophthalmologist. Conclusions Without proper treatment, Wilson’s disease is a progressive and fatal disease. Therefore, it’s of upmost importance to recognize the clinical signs that raise suspicion of this disorder, especially recent onset in young adult of miscellaneous psychotic symptoms with movement disorders. Disclosure No significant relationships. more...

Abstract Cement is considered the basic component with the highest environmental impact in construction, in terms of CO2 emissions. As for the aggregates, the process of comminution of rocks, in addition to artificial sand, generates stone powder that ends up being stored outdoors, generating environmental damages. Thus, the replacement of cement by stone powder appears as an attractive alternative towards the sustainable concretes. In this context, the objective of this paper is to determine the maximum packing density in Portland cement, silica fume and stone dust pastes, to determine the optimal cement substitution content for the stone powder. In addition, it is intended to verify the influence of excess water on the consistency of the mixtures produced. The substitution was done in contents equal to 0%, 7%, 14% and 21% by volume and, for each content, the packing density was determined analytically by CPM model and combinations were reproduced experimentally. Excess water was checked by the mini Kantro cone test. The results showed that the higher cement substitution content of the stone powder obtained the higher packing density, experimental and analytical, and the higher workability, allowing economic and environmental advantages. Analyzing each material, the stone powder resulted in the highest packing density and silica fume is the lowest one. Therefore, finer particles resulted in lower packaging densities, due to the greater specific surface area, which demands more water. The agglomeration resulted in more empty gaps between the grains. In addition, mixtures flowability increased with the increase of the stone powder content. As the excess water is responsible for mixture lubrication, a higher packing density for a given volume of water improves the flowability. more...

Nowadays the demand for high strength steels is increasing. In order to design and develop high performance products, it is essential to understand the fatigue behavior of these materials. When considering welded components, the fatigue behavior is even more complex. The material parameters may change along the crack growth and mixed mode crack propagation may also occur. To assess welded high strength steel fatigue behavior, different welded CT specimens were tested. The Paris law material constants were obtained for the heat affected zone material. Fatigue crack growth life predictions were made using the obtained parameters and different automatic techniques. Previous work showed that the ABAQUS extended finite element method can predict fatigue crack growth, but as the implementation of the Paris law is not straight forward, to many conversions must be made and the results are too computer intensive. A simpler and more intuitive Python algorithm was developed, to enable the use of the experimental material parameters, to predict the crack propagation path. The obtain results show a good agreement with both the experimental Paris curves, and the analytical solution. more...

Introduction Neurosciences evolved very rapidly in last few years and helped the establishment of Liaison Psychiatry as a fundamental part of the general hospitals functioning. However, the use of this department by the other specialties still needs to be refined, as it is common to find wrong assessments in the referral of the patients. Objectives We aim to study the concordance between the referral motives and the assessment by the psychiatry team. Methods Data was collected through the informatic registry. Contains patient data observed by a liaison psychiatrist in the period between 1st of July and 30th of September of 2020. In this period there were 80 requests, of which, 6 were refused for various reasons. We decided to study the concordance when one of these symptoms were in the request: anxious symptoms, depressive symptoms, psychotic symptoms and psychomotor agitation. 46 requests met this criteria. Results The mean age was 63,3yo and 46% were older than 65yo. Most were women (54%) and 68% had history of psychiatry disorder. About 50% were requests from the Medicine wards. The concordance between the medical request and the psychiatry assessment was higher for psychomotor agitation (n=11; 64%) and depressive symptoms (n=23; 57%), but it was lower in anxious symptoms (n=3; 33%) and in psychotic symptoms (n=9; 33%). Most common diagnosis was delirium. Conclusions Non-psychiatrist doctors appear to have more difficulty when assessing anxious and psychotic symptoms. Those concordance percentages are in line with recent research. Actions should be taken to improve this, like academic training and standardization of referral. Disclosure No significant relationships. more...

Abstract Silica fume (SF) is the most commonly mineral admixture used for the production of high-strength concrete (HSC) due to its chemical characteristics of pozzolanic reactivity and physical filling effect. The objective of the present work is to compare the SF content by the chemical analysis of the pozzolanic reaction and the physical behavior by particle packing techniques. The first step of the study was to analyze the SF content to consume the calcium hydroxide (CH) produced during the hydration of Portland cement (PC), based on stoichiometric calculations. Then, the SF content for maximum packing density was obtained using analytical particle packing models and experimental tests. The compressive strength of the pastes was also measured. The results showed that the theoretical SF content for consuming CH is 15.6%, replacing PC. According to the packing density analytical models, the ideal SF content is 15% of the total fine materials. However, the experimental results indicated the use of a smaller SF content (10%). This difference between theoretical and experimental results is probably due to the high specific surface of the SF, which results in important surface forces between the grains, particle agglomeration and difficulty in SF densification with water. more...

A construção de barragens de CCR prioriza a minimização de interferências, como a execução da face de montante, para garantia da produtividade. O estudo procurou avaliar as propriedades físicas do CCR enriquecido com calda, em substituição ao concreto convencional usualmente empregado na face, utilizando os mesmos materiais, central de concreto, mão de obra e equipamentos, empregados na construção da Usina Hidrelétrica Mauá. Para tanto foram feitos prismas experimentais de campo (com diferentes relações água/cimento e quantidades de calda) e posterior extração de testemunhos, os quais foram submetidos a ensaios mecânicos e de permeabilidade. Os resultados mostraram que para relações água/cimento 0,74, o material resultante atendeu às especificações de projeto, para consumos de cimento notadamente menores (entre 70 e 85% do CCV). more...

Chagas' myocardiopathy, caused by the intracellular protozoan Trypanosoma cruzi, is characterized by microvascular alterations, heart failure and arrhythmias. Ischemia and arrythmogenesis have been attributed to proteins shed by the parasite, although this has not been fully demonstrated. The aim of the present investigation was to study the effect of substances shed by T. cruzi on ischemia/reperfusion-induced arrhythmias. We performed a triple ischemia-reperfusion (I/R) protocol whereby the isolated beating rat hearts were perfused with either Vero-control or Vero T. cruzi-infected conditioned medium during the different stages of ischemia and subsequently reperfused with Tyrode's solution. ECG and heart rate were recorded during the entire experiment. We observed that triple I/R-induced bradycardia was associated with the generation of auricular-ventricular blockade during ischemia and non-sustained nodal and ventricular tachycardia during reperfusion. Interestingly, perfusion with Vero-infected medium produced a delay in the reperfusion-induced recovery of heart rate, increased the frequency of tachycardic events and induced ventricular fibrillation. These results suggest that the presence of parasite-shed substances in conditioned media enhances the arrhythmogenic effects that occur during the I/R protocol. more...

Chagas' myocardiopathy, caused by the intracellular protozoan Trypanosoma cruzi, is characterized by microvascular alterations, heart failure and arrhythmias. Ischemia and arrythmogenesis have been attributed to proteins shed by the parasite, although this has not been fully demonstrated. The aim of the present investigation was to study the effect of substances shed by T. cruzi on ischemia/reperfusion-induced arrhythmias. We performed a triple ischemia-reperfusion (I/R) protocol whereby the isolated beating rat hearts were perfused with either Vero-control or Vero T. cruzi-infected conditioned medium during the different stages of ischemia and subsequently reperfused with Tyrode's solution. ECG and heart rate were recorded during the entire experiment. We observed that triple I/R-induced bradycardia was associated with the generation of auricular-ventricular blockade during ischemia and non-sustained nodal and ventricular tachycardia during reperfusion. Interestingly, perfusion with Vero-infected medium produced a delay in the reperfusion-induced recovery of heart rate, increased the frequency of tachycardic events and induced ventricular fibrillation. These results suggest that the presence of parasite-shed substances in conditioned media enhances the arrhythmogenic effects that occur during the I/R protocol. more...

Water supply systems (WSSs) are vital infrastructures for the well-being of people today. To achieve good customer satisfaction the water supply service must always be able to meet people's needs, in terms of both quantity and quality. But unpredictable extreme conditions can cause severe damage to WSSs and lead to poorer levels of service or even to their failure. Operators dealing with a system's day-to-day operation know that events like burst water mains can compromise the functioning of all or part of a system. To increase a system's reliability, therefore, designs should take into account operating conditions other than normal ones. Recent approaches based on robust optimization can be used to solve optimization problems which involve uncertainty and can find designs which are able to cope with a range of operating conditions. This paper presents a robust optimization model for the optimal design of water supply systems operating under different circumstances. The model presented here uses a hydraulic simulator linked to an optimizer based on a simulated annealing heuristic. The results show that robustness can be included in several ways for varying levels reliability and that it leads to more reliable designs for only small cost increases. more...

Los nanotubos de carbono (NTC) son estructuras de carbono que se obtienen en forma cilindrica de escala nanométrica. Este artículo presenta una evaluación de la adición de NTC en hormigón de cemento Portland, centrándose en la importancia de llevar a cabo la dispersión de los NTC en el agua con el uso del ultrasonido antes de su incorporación en la masa de hormigón. Para ello, tres mezclas de hormigón se prepararon con un NTC libre (referencia) y dos NTC (con una serie previa de dispersión en agua y el aditivo con el uso de ondas ultrasónicas y otras sin dispersión). A continuación, se analizó las propiedades de fluidez, resistencia a la compresión, tracción y la absorción del agua. El NTC añadió contenido de 0,30% a respecto de la masa de cemento. En todos los casos, la dispersión previa de NTC usando ultrasonido potenció el efecto de la adición de nanotubos de carbono, siendo importante para la eficiencia de este material cuando se añade al cemento more...

Este trabalho objetivou determinar a mobilidade do sulfentrazone em duas classes de solos em função de índices pluviométricos, bem como possíveis influências das propriedades químicas e físicas de Latossolo Vermelho e Chernossolo com diferentes teores de ferro na ação do herbicida. Foram utilizados como recipientes 36 tubos de PVC de 10 cm de diâmetro por 50 cm de comprimento. Os recipientes foram preenchidos com os solos e umedecidos a 65% (p/p) da capacidade de saturação, quando se fez a aplicação do sulfentrazone (800 g ha-1 de i.a.) na área exposta dos solos. Na seqüência, foram simuladas chuvas diárias de 10 mm até atingir o índice pluviométrico desejado (30, 60 e 90 mm), sendo, posteriormente, desmontados seis tubos de cada solo (com e sem aplicação). Foram semeadas cinco sementes de sorgo (Sorghum bicolor) nas profundidades de 2,5; 7,5; 12,5; 17,5; 22,5; e 30,0 cm, mantidas em casa de vegetação por 15 dias para avaliação da germinação e do crescimento inicial. Decorrido esse tempo, foi realizada avaliação de possíveis alterações morfofisiológicas que pudessem ser caracterizadas como efeitos tóxicos do produto e mediu-se o comprimento da parte aérea até a última lígula visível. As partes aéreas foram secas em estufa com circulação forçada de ar (70 ºC por 96 horas), para obtenção de matéria seca. No Chernossolo ocorreu uniformidade da distribuição do produto ao longo do tubo, proporcional à precipitação, e no Latossolo Vermelho o sulfentrazone foi pouco móvel, permanecendo na camada superficial, independentemente da precipitação.This study aimed to determine the mobility of sulfentrazone in two soil classes as a function of increasing rain indices, as well as possible influences of chemical and physical properties of soils with different iron oxide contents (Red Latosol and Chernosol), on herbicide action. The containers consisted of 36 PVC tubes (10 cm diameter x 50 cm long), which were filled with the soils and saturated in 65% (w/w) water followed by sulfentrazone (800 g ha-1 of a.i.) application on the exposed area. Daily rainfalls of 10 mm were subsequently simulated and, as the desired rain indices were reached (30, 60 and 90 mm), six PVC tubes from each soil (with and without application) were disassembled. Five sorghum (Sorghum bicolor) seeds were seeded on soil at depths of 2.5; 7.5; 12.5; 17.5; 22.5 and 30.0 cm, and maintained under greenhouse conditions for 15 days for germination and initial growth evaluation. Also, evaluation of possible morphophysiological changes that could be characterized as toxic effects of the product was carried out and shoot length up to the last visible ligule was measured. The shoots were bagged and dried in a forced draught over (70 ºC for 96 h) to dry matter determination. There was a uniform distribution of the product on the length of the tube, proportional to the rainfall on Chernosol; on Red Latosol, sulfentrazone had little mobility, remaining on the top 2.5 cm, regardless of the rainfall. more...

Forecasting maximum temperature is very important for the population. In order to offer a way of forecasting this temperature, a method was adapted and tested based on the height of the layer with a dry adiabatic lapse rate. The database was formed over a period of three years: 1998, 1999 and 2000. Determination and correlation coefficients were calculated in order to verify the method validity. Also, several statistical characteristics were determined and the observed and forecasted maximum temperature series were compared. The results show that the method tested is a good one, at least for the region of Pelotas.La predicción de la temperatura máxima es muy importante para la población. Con el objeto de ofrecer un método de prever esta temperatura, fue adaptado y testado un método que es basado en la altura de la capa con gradiente vertical adiabático seco. La base de datos consistió de tres años: 1998, 1999 y 2000. Los coeficientes de determinación y de correlación fueran determinados y las dos series, temperatura máxima observada y temperatura máxima prevista, fueron comparadas. Los resultados muestran que el método testado es bueno, al menos, para la región de Pelotas. more...

The clay mined at the Asseiceira quarry near the city of Tomar, Portugal, has traditionally been used to manufacture hollow brick. However, since an assessment has shown the ceramic properties of the strata to vary, the quarry could potentially produce clay blends of different qualities to form raw materials appropriate for items demanded by different market segments, such as high quality facing brick and roof or floor tiles. The composition and texture of the various clay materials identified in the Asseiceira quarry were characterized using analytical techniques such as X-ray diffraction (XRD), X-ray fluorescence (XRF), Atterberg limits and grain size analysis The phases resulting from the thermal transformations taking place during drying and firing were identified with thermogravimetric (TG), differential scanning calorimetric (DSC), and thermodilatometric (TD) techniques. Finally, certain relevant ceramic properties such as linear shrinkage, bending strength and water absorption at 875 °C, 950 °C, 1025 °C and 1100 °C were determined on the raw material after extrusion. more...

A utilização intensiva de máquinas e implementos agrícolas no nordeste do estado de São Paulo tem contribuído para aumentar as áreas com problemas de compactação, provavelmente pela ausência de um cronograma de trabalho bem definido ou de modelos capazes de estimar a capacidade de suporte do solo. O trabalho foi desenvolvido em Guariba (SP), com o objetivo de avaliar a variabilidade espacial da resistência à penetração do solo, umidade e densidade do solo em um Latossolo Vermelho eutroférrico sob cultivo de cana-de-açúcar. Os solos foram amostrados nos pontos de cruzamento de uma malha, com intervalos regulares de 10 m, perfazendo um total de 100 pontos, nas profundidades de 0,0-0,2 e 0,2-0,4 m. O coeficiente de variação indicou baixa variabilidade para umidade e densidade do solo nas duas profundidades e alta para resistência à penetração do solo. Observou-se um grau forte de dependência espacial para todas variáveis, exceto para densidade do solo na profundidade de 0,2-0,4 m que apresentou grau moderado de dependência espacial. Os altos valores para a resistência à penetração e densidade do solo, principalmente na profundidade de 0,2-0,4 m, indicaram compactação nesta camada. Pequenas variações nas formas do relevo condicionam variabilidade diferenciada nos atributos físicos dos solos.The intensive use of machines and agricultural equipments in the northeastearn São Paulo State has contributed to increase the areas with compaction problems, probably due to the absence of a well-defined operation chronogram or of models capable of predicting the soil support capacity. This study was conducted in Guariba (SP), with the objective of evaluating the spatial variability of the penetration resistance, soil moisture, and bulk density of a Oxisol (rhodic Eutrustox) under sugar-cane cultivation. The soils were sampled at the crossing points of a grid with regular 10 m intervals at depths of 0.0-0.2 m and 0.2-0.4 m. The coefficient of variation indicated low variability for soil moisture and bulk density of the soil at the depths 0.0-0.2 m and 0.2-0.4 m and a high variability for penetration resistance. Strong spatial dependence was observed for all variables, except for bulk density in the 0.2-0.4 m layer, which presented moderate spatial dependence. The high values observed for soil penetration resistance and bulk density, mainly in the 0.2-0.4 m layer indicates compaction in this layer. Small variations in the landscape forms can define different spatial variability for the soil physical attributes. more...

Com o objetivo de avaliar as relações entre formas de paisagem e erosão em um Latossolo Vermelho eutroférrico (LVef) por meio de técnicas geoestatísticas na Fazenda Santa Isabel, município de Jaboticabal (SP), identificaram-se modelos de paisagem côncavo e linear. Coletaram-se amostras de solo em ambas as formas de paisagem em uma malha regular espaçada de 50 x 50 m em sete transeções na profundidade de 0,00-0,20 m, totalizando 412 pontos em 93 ha. Determinou-se a erodibilidade dos solos pelo método indireto, granulometria, bem como o carbono orgânico para cada ponto da malha, sendo esses valores usados na estimativa do potencial natural de erosão (pne). Os dados obtidos das propriedades de solo, erodibilidade e potencial natural de erosão foram analisados por meio de estatística descritiva e geoestatística com a modelagem de semivariogramas, sendo este utilizado para a confecção de mapas de krigagem. Segundo os resultados, as propriedades do solo e do pne apresentaram maior variabilidade espacial na pedoforma côncava, apesar de esta forma de paisagem apresentar menores perdas de solo por erosão e menor variabilidade espacial da erodibilidade. Deste modo, conclui-se que a erosão não adicionou variabilidade espacial para as propriedades do solo na mesma magnitude do relevo.The aim of this work was to evaluate the relations between landforms and soil erosion of an Oxissol with geostatistical techniques in Jaboticabal (SP), Brazil, in two landform models: concave and linear. Soil samples were collected from both landforms at a depth of 0-20 cm, in a regular 50 x 50 m mesh of seven transects, at totally 412 grid points within an area of 93 ha. Physical and chemical properties were determined at each point and used to estimate the soil erodibility by indirect methods and, consequently, the erosion potential. Descriptive statistics and geostatistics were applied to the physical and chemical values of soil erodibility and erosion potential in order to compute mean, semivariograms and kriging interpolation. Soil properties as well erosion potential demonstrated greater spatial variability in the concave landform, while erodibility presented a lower spatial variability in this form. Therefore, we conclude that erosion did not affect the spatial variability of soil attributes when the same landform is considered. more...

O objetivo deste trabalho foi determinar a mobilidade do herbicida sulfentrazone em duas classes de solos (Nitossolo Vermelho e Neossolo Quartzarênico), em função de índices pluviométricos crescentes, sendo, portanto, influenciado pelas propriedades químicas e físicas dos solos com diferentes teores de ferro. Em tubos de PVC de 10 cm de diâmetro por 50 cm de comprimento, preenchidos com os solos e saturados com água a 65% (p/p), foi aplicado o sulfentrazone (800 g ha-1). Na seqüência, foram simuladas chuvas diárias de 10 mm até atingir os índices pluviométricos de 30, 60 e 90 mm. Os tubos de PVC foram então desmontados - semeando-se Sorghum bicolor nas profundidades correspondentes de 2,5; 7,5; 12,5; 17,5; 22,5; e 30,0 cm da superfície do tubo - e mantidos em casa de vegetação por 15 dias, para avaliação da germinação e do crescimento inicial das plântulas. No final do experimento foram avaliadas as alterações morfofisiológicas que caracterizavam os efeitos tóxicos do produto, além de se medir o comprimento da parte aérea até a última lígula visível e a fitomassa seca das plantas. Quando sob precipitação de 90 mm no Neossolo Quartzarênico, o sulfentrazone formou uma banda de arraste de até 12,5 cm e, no Nitossolo Vermelho, até os 7,5 cm.The objective of this work was to determine the mobility of sulfentrazone in two soil classes (Red Nitosol and Quartzarenic Neosol), as a function of increasing rainfall indices, being the herbicide was influenced by the chemical and physical properties of the soils with different iron contents. Sulfentrazone (800 g ha-1) was applied on 10 cm diameter x 50 cm long PVC tubes, filled with the soils and saturated with water at 65% (w/w). Subsequently, 10 mm rainfall events were simulated daily until 30, 60 and 90 mm rainfall indices were reached. The PVC tubes were then disassembled and Sorghum bicolor seeds were sowed on soil at depths of 2.5; 7.5; 12.5; 17.5; 22.5 and 30.0 cm from the tube surface and maintained in a greenhouse for 15 days for germination and initial growth evaluation. In the end of the experiment the morphophysiological changes, which characterized the toxic effects of the product, were evaluated. The length of the shoot, up to the last visible ligule and the plant dry biomass were also measured. When submitted to a 90 mm rainfall in the Quartzarenic Neosol, sulfentrazone formed a band that percolated down to 12,5 cm and in the Red Nitosol, down to 7,5 cm. more...

In this study we propose a suitable method for the solar-activated controlled release of volatile compounds from polymeric microcapsules bonded with photocatalytic nanoparticles. These reservoirs can find applications, for example, in the controlled release of insecticides, repellents, or fragrances, amongst other substances. The surfaces of the microcapsules have been functionalized with TiO2 nanoparticles. Upon ultraviolet irradiation, redox mechanisms are initiated on the semiconductor surface resulting in the dissociation of the polymer chains of the capsule wall and, finally, volatilization of the encapsulated compounds. The quantification of the output release has been performed by gas chromatography analysis coupled with mass spectroscopy. more...

Comparou-se as características químicas, físicas e mineralógicas de Latossolos Roxos desenvolvidos de rocha alcalina (LRe) e de rocha eruptiva básica (LRd), da região de Jaboticabal, SP. Os resultados indicaram que o LRe apresenta-se num estádio de desenvolvimento, comparativamente, menos evoluído que o LRd, enquanto esse se apresenta com tendência para a maturidade. Os menores teores de argila e ferro total e maiores teores de saturação por bases, Ki e CTC da fração argila apresentados pelo LRe comprovam esta tendência. Conclui-se que a ocorrência de Latossolo Roxo eutrófico no campus da UNESP-Jaboticabal, pode estar associada a participação de rochas alcalinas na sua pedogênese.A comparative study was carried out on chemical, physical and mineralogical characteristics of dusky red latosols originated from the weathering of alcaline (LRe) and basic eruptive rocks (LRd), of the Jaboticabal country Brazil The results showed that the LRe presented a younger development stage than LRd, while this soil showed a tendency to maturity. This trend was corraborated through the lower clay and total Fe2O3, contents and higher base saturation contents, Si2O/Al2O3 molecular ratio (Ki) and clay f ration CEC presented by LRe. It can be concluded that the occurrence of eutrophic dusky red latosols hi the UNESP-Jaboticabal campus may be due to the influence of alcaline rocks. more...

In the globalized, technologically advanced landscape, coopetition—simultaneously cooperating and competing—has become a key strategy for innovation and enhanced value creation. This research focuses on the impact of technology-driven coopetition networks in the Portuguese ornamental stone sector, using a framework based on Service-Dominant Logic (S-D Logic). It emphasizes the importance of resource integration, service exchange, and institutional arrangements in successful coopetition. Employing a two-phase experimental approach with selected small and medium enterprises (SMEs), this study assesses customer perceptions of product quality under traditional best practices versus those enabled by technology-driven coopetition networks. The results indicate a notable improvement in the customer-perceived quality and outcome consistency. The statistical analysis shows that these networks allow firms to better align with customer expectations, optimize resource allocation, and improve operational coordination. The findings highlight the strategic potential of coopetition networks, particularly when augmented by advanced technologies like IoT-based systems. These networks facilitate sustainable value co-creation and operational resilience by enabling firms to share expertise, distribute tasks, and synchronize efforts. This research contributes to the coopetition and S-D Logic literature by offering a practical framework for firms aiming to boost competitiveness and sustain growth in dynamic service ecosystems. [ABSTRACT FROM AUTHOR] more...

Coopetition, the strategic blend of competition and collaboration, has emerged as a critical strategy for firms navigating today's interconnected and resource-constrained global economy. While coopetition networks offer substantial benefits, such as fostering innovation, market expansion, and scalability, they are fraught with challenges like resource-sharing risks, trust deficits, and the inherent tension between collaboration and competition. Despite these hurdles, the transformative potential of technology in enabling and enhancing coopetition networks remains underexplored. This study addresses this gap by integrating Service-Dominant Logic (S-D Logic) and institutional work to propose a comprehensive framework for technology-driven coopetition networks. It identifies seven systemic building blocks—coopetition actors, resource integration, service exchange, institutions, nested ecosystems, operand technologies, and operant technologies—that facilitate sustainable value co-creation. These components enable firms to navigate dynamic market conditions by fostering trust, collaboration, and innovation. This research emphasizes technology's pivotal role as a transformative enabler and strategic driver, enabling real-time interaction, seamless resource integration, and institutional alignment. Institutional work is highlighted as essential for managing regulatory, normative, and cognitive dimensions to ensure the Adaptability and longevity of coopetition ecosystems. By providing actionable insights into the design and management of resilient, technology-driven coopetition networks, this study offers a roadmap for sustainable and equitable value distribution. It contributes to the evolving discourse on strategic business networks, empowering organizations to harness the power of coopetition in an increasingly complex global marketplace. [ABSTRACT FROM AUTHOR] more...

A construção de barragens de CCR prioriza a minimização de interferências, como a execução da face de montante, para garantia da produtividade. O estudo procurou avaliar as propriedades físicas do CCR enriquecido com calda, em substituição ao concreto convencional usualmente empregado na face, utilizando os mesmos materiais, central de concreto, mão de obra e equipamentos, empregados na construção da Usina Hidrelétrica Mauá. Para tanto foram feitos prismas experimentais de campo (com diferentes relações água/cimento e quantidades de calda) e posterior extração de testemunhos, os quais foram submetidos a ensaios mecânicos e de permeabilidade. Os resultados mostraram que para relações água/cimento 0,74, o material resultante atendeu às especificações de projeto, para consumos de cimento notadamente menores (entre 70 e 85% do CCV). more...