The use of materials such as organofunctionalized silica for application in solid phase extraction (SPE) allows the preconcentration of several ions, including Pt, and subsequent detection. This work aims to synthesize and characterize an organofunctionalized silica (Sil-TMSDT) with the silylant N’(trimethoxysilyl)propylethylenetriamine and its application as a solid phase in the preconcentration Pt4+ ions in aqueous media, using detection by flame atomization atomic absorption spectroscopy (FAAS). The Fourier-transform infrared spectroscopy (FTIR) spectra and scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS) confirmed the aminofunctionalization of the silica. For the adsorption process, a preconcentration mini-column with 200 mg of Sil-TMSDT, a solution of 0.485 mg L−1 of K2[PtCl6] at pH 10 and HNO3 0.5 mol L−1 as eluent were used, obtaining an enrichment factor of 15-fold with retention efficiency higher than 99%. The Pt4+ ion determined by FAAS showed a linear response between 0.02 and 0.40 mg L−1; a linear coefficient where R = 0.9981; a 16-fold preconcentration factor; a limit of quantification (LOQ) and limit of detection (LOD) of 0.045 and 0.014 mg L−1, respectively. The proposal system showed analytical applicability to determining Pt4+ ion in an aqueous medium and could be used to detect traces of this potentially toxic metal in biological fluids such as urine and blood. SPE (SPE Pt SilTMSDT Sil TMSDT (Sil-TMSDT Ntrimethoxysilylpropylethylenetriamine N trimethoxysilyl propylethylenetriamine Pt4 media FAAS. . (FAAS) Fouriertransform Fourier transform FTIR (FTIR SEM (SEM energydispersive energy dispersive EDS (EDS process minicolumn mini column 20 SilTMSDT, TMSDT, Sil-TMSDT 0485 0 485 0.48 L1 L 1 L− K2PtCl6 KPtCl K2 PtCl6 K PtCl K2[PtCl6 HNO 05 5 0. 15fold fold 15 99 99% 002 02 0.0 040 40 0.4 0.9981 09981 9981 16fold 16 LOQ (LOQ LOD (LOD 0045 045 0.04 0014 014 0.01 respectively blood (FAAS 2 048 48 K2PtCl K2[PtCl 9 00 04 4 0.998 0998 998 004 001 01 0.99 099 0.9 09

Two poly(acrylic acid-b-acrylamide) copolymers, and a poly(acrylic acid) homopolymer were synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization and tested for nickel removal from aqueous media. RAFT was used for better interchain composition homogeneity and to facilitate the synthesis of the block copolymers. Liquid-phase polymer-based retention (LPR) was used to compare the nickel binding capacity. Uptake tests were carried out at pH 3.0, 4.0, and 5.0. Nickel adsorption isotherms in the range of 1 to 7 mmol L−1 were achieved and the Langmuir adsorption model was applied. Maximum binding capacity (Qm) of Ni2+ at 298 K depended on the composition of the copolymers and pH. The polyacid block (PAA) was the major structural feature responsible for high values of nickel binding. All materials presented better uptake at higher pH, probably due to polyacid deprotonation and the increase in the electrostatic interactions. Up to approximately 100 mg of nickel per gram of homopolymer could be retained at pH = 5.0. Even though the presence of a poly(acrylamide) block decreases the binding capacity compared to PAA, that block has a specific contribution to nickel binding and can also provide better features to the material as better solubilization, and others. polyacrylic poly acrylic acidbacrylamide acid b acrylamide acid-b-acrylamide additionfragmentation addition fragmentation (RAFT media Liquidphase Liquid phase polymerbased polymer based LPR (LPR 30 3 0 3.0 40 4 4.0 50 5 5.0 L1 L L− applied Qm (Qm Ni2 Ni 29 PAA (PAA interactions 10 polyacrylamide poly(acrylamide solubilization others 3. 4. 5. 2

RESUMO A capacidade de campo do Latossolo foi avaliada usando os métodos de densidade de fluxo de água em campo, modelo Arya-Paris e câmara de pressão de Richards com amostras não deformadas, e a curva de retenção de água e a umidade do solo foram determinadas usando o modelo de Arya-Paris a uma pressão de 10 kPa. A pesquisa foi desenvolvida na Universidade Federal de Rondonópolis, Mato Grosso. O solo avaliado foi Latossolo nas camadas 0-10 e 10-20 cm. Usando o método da densidade de fluxo, a uma densidade de fluxo de água q = 0,10 mm por dia e 1,0 mm por dia, os valores de umidade do solo na capacidade de campo foram de 0,30 e 0,32 m3 m-3, respectivamente, para uma profundidade de 0-10 cm, e 0,28 e 0,31 m3 m-3, respectivamente, para uma profundidade de 10-20 cm. Comparando os resultados obtidos com a câmara de pressão com os da capacidade de campo obtidos para q = 0,1 mm por dia, o erro absoluto médio e o viés foram 0,880 e -0,218, respectivamente, para a profundidade de 0-10 cm, e 2,57 e -2,57, respectivamente, para a profundidade de 10-20 cm. A capacidade de campo do Latossolo pode ser obtida submetendo amostras não deformadas de 50 cm3 a uma pressão de 10 kPa. O modelo Arya-Paris é uma alternativa para determinar a curva de retenção de água do solo e a capacidade de campo do Latossolo. AryaParis Arya Paris 1 kPa Rondonópolis Grosso 010 0 0-1 1020 20 10-2 cm 1, 030 30 0,3 032 32 m m3, 3, 3 m-3 respectivamente 028 28 0,2 031 31 01 0, 0880 880 0,88 0,218, 0218 218 -0,218 257 2 57 2,5 2,57, -2,57 5 0- 102 10- 03 m- 02 088 88 0,8 0,218 021 21 -0,21 25 2, -2,5 08 8 0,21 -0,2 -2, -0, -2 -0 -

ABSTRACT The field capacity of Oxisol was evaluated using the flux density in the field, Arya-Paris model, and Richards pressure chamber with non-deformed samples, and the water retention curve and soil moisture were determined using the Arya-Paris model at a pressure of 10 kPa. The research was conducted at the Federal University of Rondonópolis, Mato Grosso state, Brazil. The soil evaluated was Oxisol at depths of 0-10 and 10-20 cm. Using the flux density method, at a water flux density q = 0.10 mm per day and 1.0 mm per day, soil moisture values at field capacity were 0.30 and 0.32 m3 m-3, respectively, at a depth of 0-10 cm and 0.28 and 0.31 m3 m-3, respectively, at a depth of 10-20 cm. Comparing the results obtained with the pressure chamber with those of the field capacity obtained for q = 0.1 mm per day, the mean absolute error and bias were 0.880 and -0.218, respectively, for the 0-10 cm depth and 2.57 and -2.57, respectively, for the 10-20 cm depth. Field capacity of Oxisol can be obtained by subjecting undeformed 50 cm3 samples to a pressure of 10 kPa. The Arya-Paris model is an alternative for determining the soil water retention curve and the field capacity of Oxisol. AryaParis Arya Paris nondeformed non deformed 1 kPa Rondonópolis state Brazil 010 0 0-1 1020 20 10-2 method 1. 030 30 0.3 032 32 m m3, 3, 3 m-3 respectively 028 28 0.2 031 31 01 0. 0880 880 0.88 0.218, 0218 218 -0.218 257 2 57 2.5 2.57, -2.57 5 0- 102 10- 03 m- 02 088 88 0.8 0.218 021 21 -0.21 25 2. -2.5 08 8 0.21 -0.2 -2. -0. -2 -0 -

ABSTRACT The spatial variability of soil attributes in terraced areas is poorly studied in the semi-arid region. Considering that multivariate analysis enhances the diagnosis of spatial variability from geostatistics, soil attributes were studied in different zones between terrace channels in semi-arid region, more precisely in a retention terrace area in Canindé (Ceará, Brazil). Soil samples (n = 100) were collected at depths of 0.0 - 0.1 and 0.1 - 0.2 m for descriptive and geostatistical analysis. For multivariate analysis, samples from three zones relative to the terrace channel (Upper, Middle, and Lower) in the 0.0 - 0.2 m layer were considered, with 30 replicates. There was spatial dependence of soil attributes in the two layers studied. Near the channel, in the respective layers, there was higher clay content (13.7% and 14.7%) and higher degree of flocculation (61.3% and 71.7%) compared to the other zones. Water-dispersible clay was higher in the Upper zone (6.5% and 7.7% in the respective layers), while the Middle zone showed higher potential acidity in the evaluated layers (4.8 and 4.5 cmolc dm-3, respectively) compared to the other zones. In the multivariate analysis, there were highlights for the higher sum of bases in the Upper zone (18.9 ± 0.8 cmolc dm-3), higher sand content in the Middle zone (72.6 ± 0.6%), lower potential acidity (2.1 ± 0.2 cmolc dm-3) and higher phosphorus content (12.8 ± 3.0 mg kg-1) in the Low zone. The zone above the terrace channel loses mainly clay and requires practices to increase water and nutrient retention. semiarid semi arid region geostatistics Ceará, Ceará (Ceará Brazil. Brazil . Brazil) n 100 00 0 0. 01 1 02 2 Upper, (Upper Lower considered 3 replicates 13.7% 137 13 7 (13.7 14.7% 147 14 61.3% 613 61 (61.3 71.7% 717 71 Waterdispersible Water dispersible 6.5% 65 6 5 (6.5 77 7.7 , layers) 4.8 48 4 8 (4. 45 4. dm3, dm3 dm 3, dm-3 respectively 18.9 189 18 9 (18. 08 72.6 726 72 (72. 0.6%, 06 0.6% 0.6%) 2.1 21 (2. 12.8 128 12 (12. 3. kg1 kg kg-1 10 13.7 (13. 14.7 61.3 (61. 71.7 6.5 (6. 7. (4 dm- 18. (18 72. (72 0.6 2. (2 12. (12 kg- 13. (13 14. 61. (61 71. 6. (6 ( (1 (7

Abstract In order to widen the application fields of thermosetting composites, this research aims to identify the bioresins and biofibers more resistant to weathering, enabling their use outdoors. Data were collected from experimental research on composites made from synthetic or plant-derived matrix with plant or hybrid fibers, and using various molding processes, reinforcement geometries, alignment and treatment of fibers and fiber/matrix fractions. The investigation searched for researches that studied the composites tensile and flexural strengths; their water absorption in 24 hours of immersion and until saturation; and their retention of mechanical strength after aging. The effect of matrix and fiber types and their fractions on these properties was studied. Results indicate that composites with plant-derived matrix absorb less water in 24h, and that composites with flax, sisal or hemp have the lowest water absorption at saturation and the greater retention of tensile strength after aging. In other words, apparently these composites are less prone to weathering and thus have potential for outdoor use. However, regardless of the fiber type, as its content increases, the retention of flexural strength of composites decreases, limiting their usage in some applications. outdoors plantderived derived processes geometries fibermatrix strengths 2 aging 24h h flax words However type increases decreases applications

Resumo Buscando ampliar a aplicação dos compósitos termorrígidos, esta pesquisa objetiva identificar as bioresinas e biofibras mais resistentes às intempéries, contribuindopara seu uso externo. Foram levantadas pesquisas experimentais sobre compósitos com matriz sintética ou vegetal e fibras vegetais ou híbridas, com diferentes processos de moldagem, geometrias de reforço, alinhamento e tratamento das fibras e frações fibras/matriz. Buscou-se trabalhos que estudaram as resistências à tração e à flexão; a absorção de água dos compósitos em 24h de imersão e até a saturação; e sua retenção da resistência mecânica após envelhecimento. Investigou-se a influência do tipo de matriz e de fibra e de suas frações nessas propriedades. Resultados indicam que compósitos de matriz vegetal absorvem menos água em 24h, e que compósitos com linho, sisal ou cânhamo possuem a menor absorção de água na saturação e maior retenção da resistência à tração após o envelhecimento. Isto é, aparentemente esses compósitos sofrem menos danos devido às intempéries, possuindo maior potencial para uso externo. Mas, independentemente da fibra, conforme sua quantidade aumenta, diminui a retenção da resistência à flexão dos compósitos, limitando sua aplicação. termorrígidos intempéries externo híbridas moldagem reforço fibrasmatriz fibras/matriz Buscouse Buscou se h envelhecimento Investigouse Investigou propriedades linho é Mas aumenta

Abstract Mortars’ workability results from other properties, such as consistency, plasticity, cohesion, water retention, exudation, initial adhesion and density. A workable mortar distributes itself in application, doesn’t segregate during transport, and remains plastic during the application time. This property depends on several application factors, together with the constituent materials. Therefore, this study aims to assess the influence of the formulation, aggregate type and water content on rheological behavior of rendering mortars, combined with particle packing studies. For this purpose, three usual mortar formulations were chosen. The minimum water content was calculated through the concepts of particle packing and the squeeze flow test. As a result, the influence of each constituent on the workability of the mortar was determined, together with the formulations optimized by the aggregate type. The water content analysis revealed the wet packing density and minimum value required for the formation of the water film around the particles. Mortars properties consistency plasticity cohesion retention exudation doesnt doesn t transport time factors materials Therefore formulation mortars studies purpose chosen test result determined particles

Resumo A trabalhabilidade das argamassas resulta de outras propriedades, como consistência, plasticidade, coesão, retenção de água, exsudação, adesão inicial e densidade. Uma argamassa trabalhável distribui-se durante a aplicação, não segrega durante o transporte e permanece plástica durante o tempo de aplicação. Esta propriedade depende de vários fatores de aplicação, juntamente com os materiais constituintes. Portanto, este estudo tem como objetivo avaliar a influência da formulação, do tipo de agregado e do teor de água no comportamento reológico de argamassas de reboco, aliado a estudos de empacotamento de partículas. Para tanto, foram escolhidas três formulações de argamassas usuais. O teor mínimo de água foi calculado através dos conceitos de empacotamento de partículas e teste de squeeze flow. Como resultado, foi determinada a influência de cada constituinte na trabalhabilidade da argamassa, juntamente com as formulações otimizadas pelo tipo de agregado. A análise do teor de água revelou a densidade de empacotamento úmido e o valor mínimo necessário para a formação do filme de água ao redor das partículas. propriedades consistência plasticidade coesão exsudação distribuise distribui se aplicação constituintes Portanto formulação reboco tanto usuais flow resultado

Abstract In recent years, digital transformation processes have been gaining relevance. However, not all companies are achieving the same degree of transformation. The presence of barriers and enablers plays a significant role in this process. Furthermore, the extent of digital transformation also impacts how human resources (HR) policies are deployed and influences the effect they have on employees. This work aims to understand how the digital transformation process is occurring from a qualitative approach. Specifically, this study analyzes the main drivers and barriers of firms' digitalization, as well as its effects on companies, people, and human resource practices. Eight semi-structured interviews were conducted with key informants in three companies to gain an in-depth insight into the research problem. ATLAS.ti was used for data analysis and coding. Results show the presence of barriers and facilitators documented in existing literature. However, our results reveal that the business size and the firm's main activity are important variables that affect the extent of digital transformation. The study also reveals the benefits of digitalization in terms of efficiency and human resource autonomy (flexibility, work-life balance). Likewise, the findings unveil the negative consequences of digitalization with risks such as depersonalization and isolation that undermine talent retention.

Resumen En los últimos años, el proceso de transformación digital ha ido ganando importancia. Sin embargo, no todas las empresas adquieren el mismo nivel de transformación. La presencia de barreras y facilitadores desempeña un papel importante en este proceso. Además, el alcance de la transformación digital también influye en cómo se ejecutan las políticas de recursos humanos (RH) y su impacto en los empleados. Este trabajo pretende comprender cómo se está produciendo el proceso de transformación digital desde un enfoque cualitativo. En concreto, en este estudio se analizan los principales impulsores y barreras de la digitalización en las empresas, así como sus efectos sobre la empresa, las personas y, sobre las prácticas de recursos humanos. Se realizaron ocho entrevistas semiestructuradas a informantes clave de tres empresas para conocer en profundidad el problema de investigación. Se utilizó ATLAS.ti para el análisis y la codificación de los datos. Los resultados muestran la existencia de barreras y facilitadores, tal y como ha identificado la literatura existente, sin embargo, nuestros resultados muestran que el tamaño de la empresa y el sector al que pertenece son variables importantes que afectan al nivel de transformación digital. El estudio también revela los beneficios de la digitalización en términos de eficiencia y sobre la autonomía de los recursos humanos (flexibilidad, conciliación). Asimismo, los resultados muestran también los efectos negativos de la digitalización como los riesgos como la despersonalización y el aislamiento que socavan la retención del talento.

ABSTRACT. Part of the legal literature and jurisprudence have indicated that the Vienna Convention on the International Sale of Goods contains a general right of retention based on the interpretation of several provisions of the Convention, including Article 58 and Article 71. This work analyzes these articles to determine if they are cases of the right of retention, or rather they establish cases of exceptio non adimpleti contractus in its various modalities.

RESUMEN. Parte de la doctrina y la jurisprudencia han señalado que la Convención de Viena sobre compraventa internacional de mercaderías contempla un derecho de retención general a partir de la interpretación de varios artículos de la Convención, entre ellos, el artículo 58 y el artículo 71. El presente trabajo analiza estos artículos para determinar si realmente se trata de supuestos de derecho de retención o si, más bien, establecen supuestos de excepción de contrato no cumplido en sus diversas modalidades.

ABSTRACT Blueberries are a fruit that is an important source of bioactive components beneficial to the human diet, such as anthocyanins and total phenolics, which are altered by the use of high temperatures during processing. This study aimed to evaluate the use of artificial neural networks in the optimization of sucrose concentration and time for the osmotic pre-treatment of blueberries of the Biloxi variety, to retain the greatest amount of anthocyanins and total phenolics in the subsequent preparation of jam. Artificial neural networks of the feedforward type were used, with a Backpropagation training algorithm with Levenberg-Marquardt weight adjustment, to achieve the optimal predicted combination that maximizes the retention of these bioactive components. The model achieved its best performance with 11 neurons in the hidden layer, achieving an R2 coefficient of 0.98 and a mean square error of 4.76, indicating a strong ability for generalization. Artificial neural networks allowed to obtain the best optimal combination of predicted multiple responses of factors consisting of a sucrose concentration of 1.64 M and a time of 211.52 min, which retained a higher content of total monomeric anthocyanins with 70.98 mg cyanidin-3-O-glucoside 100 g-1 of jam and total phenolics with 110.54 mg GAE g-1 of jam. On the other hand, through single-response optimization was obtained that the combination of experimental factors that maximized total anthocyanins (71.59 mg cyanidin-3-O-glucoside 100 g-1 of jam) was 1.54 M of sucrose and 232.73 min and for total phenols (111.06 mg GAE g-1 of jam) 1.79 M of sucrose and 196.36 min. The use of artificial neural networks is an excellent alternative for modeling phenomena, compared to traditional methods.

RESUMEN El arándano es un fruto que posee una fuente importante de componentes bioactivos beneficiosos para la dieta humana, como las antocianinas y fenoles totales, que se ven alterados por el uso de temperaturas altas durante el procesamiento. El objetivo de este estudio fue evaluar el uso de redes neuronales artificiales en la optimización de la concentración de sacarosa y el tiempo para el pretratamiento osmótico de arándanos de la variedad Biloxi, con la finalidad de retener la mayor cantidad de antocianinas y componentes fenólicos totales en la elaboración posterior de mermelada. Se utilizó redes neuronales artificiales del tipo feedfoward, con algoritmo de entrenamiento de Backpropagation con ajuste de pesos de Levenberg-Marquardt para lograr la combinación óptima predicha que maximice la retención de estos componentes bioactivos. El modelo logró su mejor rendimiento con 11 neuronas en la capa oculta, logrando un coeficiente R2 de 0,98 y un error cuadrático medio de 4,76; lo que indica una gran capacidad de generalización. Las redes neuronales artificiales permitieron obtener la mejor combinación de los factores experimentales -concentración de sacarosa (1,64 M) y tiempo (211,52 min)- que maximizaron los contenidos de antocianinas monoméricas totales (70,98 mg cianidina-3-O-glucósido 100 g-1) y fenoles totales (110,54 mg AGE g-1) presentes en mermelada. En cambio, mediante optimización de respuesta se obtuvo que la combinación de factores experimentales que maximizó las antocianinas totales (71,59 mg cianidina-3-O-glucósido 100 g-1 de mermelada) fue 1,54 M de sacarosa y 232,73 min y para fenoles totales (111,06 mg GAE g-1 de mermelada) 1,79 M y 196,36 min. El uso de redes neuronales artificiales es una excelente alternativa para modelar fenómenos, en comparación con los métodos tradicionales.

Abstract Oxalic acid is an organic compound found in green leafy vegetables, which has proven to be effective in delaying ripening by inhibiting ethylene synthesis in fruits such as banana, mango, peach, tomato, plum, and others. In this study, the response to oxalic acid application on postharvest physiology was evaluated in transgenic tomatoes (Solanum lycopersicum) variety TA234 with the TomLoxB gene insertion in antisense, at two concentrations of oxalic acid: 3 and 10 mM, during 30 d of storage at 25 ± 1 ºC and a relative humidity of 65 - 70 %. The fruits were harvested at break stage and immersed for 10 minutes in the oxalic acid solution, which was maintained at 25 ºC. Upon treatment, less weight loss, better retention of lightness, delay in the decrease of firmness and hue angle, decrease in lipoxygenase activity, low electrolyte leakage and increase in total phenolics content were observed. The most effective oxalic acid concentration was 3 mM, that extended postharvest life by up to 30 d and reduced deterioration of the genetically modified (GM) tomatoes. In turn, the untreated GM tomatoes showed an acceptable appearance up to day 24 of storage, while the wild type fruits were kept satisfactorily for 15 d.

Resumen El ácido oxálico es un compuesto orgánico que se encuentra en vegetales de hoja verde y que ha demostrado ser eficaz para retrasar la maduración mediante la inhibición de la síntesis de etileno en frutos. En este estudio se evaluó el efecto de la aplicación de ácido oxálico sobre la fisiología poscosecha en frutos de tomate (Solanum lycopersicum) variedad TA234 genéticamente modificados (GM) con la inserción del gen TomLoxB en antisentido, a dos concentraciones de ácido oxálico (3 y 10 mM) durante 30 d de almacenamiento a 25 ± 1 ºC y una humedad relativa del 65 - 70 %. Los frutos en estado break se sumergieron durante 10 min en la solución de ácido oxálico. Se observó una menor pérdida de peso, mejor retención de la luminosidad, un retraso en la disminución de la firmeza y del ángulo hue, disminución de la actividad lipoxigenasa, baja pérdida de electrolitos y un aumento en el contenido de fenoles totales. La concentración más eficaz fue de 3 mM, que prolongó la vida poscosecha hasta 30 d y redujo el deterioro del tomate modificado, mientras los frutos GM testigos tuvieron una vida postcosecha de 24 d y los frutos silvestres testigo se mantuvieron satisfactoriamente por 15 d.

Abstract: The objectives of this study are to typify the research designs used in research on adult learner workers and to identify the topics addressed in the research published during the years 2011 to October 2023 on Scopus and ERIC databases. A literature review is conducted using the following English descriptors: non-traditional students AND higher education AND adult education OR post-traditional students. A total of 191 publications are identified and 32 are included in the sample. Of the selected studies, 18 correspond to qualitative methodologies, 10 to quantitative methodologies, and four to mixed methodologies. The topics addressed are related to motivations, difficulties, learning, commitment, retention, abandonment, employability, and work. It is concluded that it is necessary to develop research that addresses possible teaching-learning strategies that facilitate the achievement of a defined graduation profile and, as a consequence, reduce dropouts.

Resumen: Los objetivos del presente estudio son tipificar los diseños de investigación utilizados en investigaciones en torno a estudiantes adultos trabajadores e identificar las temáticas que se abordan en las investigaciones realizadas durante los años 2011 a octubre del 2023, en bases de datos Scopus y ERIC. Se realiza una revisión de la literatura empleándose los descriptores en inglés: non-traditional students AND higher education AND adults education OR post-traditional students. Se identifican 191 publicaciones y se incluyen en la muestra 32. De los estudios seleccionados 18 corresponden a metodologías cualitativas, 10 a metodologías cuantitativas y 4 a metodologías mixtas. Las temáticas abordadas dicen relación con motivaciones, dificultades, aprendizaje, compromiso, retención, abandono, empleabilidad y trabajo. Se concluye que es necesario el desarrollo de investigaciones que aborden posibles estrategias de enseñanza-aprendizaje que faciliten el logro del perfil de egreso definido y como consecuencia se produzca una disminución en la deserción.

O estudo objetiva analisar a implementação da Lei de Cotas - Lei nº 12.711/12 - em quatro universidades federais brasileiras a partir da perspectiva dos Burocratas de Médio Escalão (BMEs). A metodologia adotada foi qualitativa, combinando análise de atas, relatórios de gestão e entrevistas com pró-reitores das universidades selecionadas. Foram realizadas dez entrevistas, das quais quatro foram analisadas no presente artigo. A pesquisa observa os desafios enfrentados pelas instituições e nas articulações feitas pelos burocratas no processo de implementação da legislação. Os resultados indicam que, embora a Lei de Cotas tenha sido amplamente implementada, sua execução envolveu desafios relacionados à validação de matrículas, especialmente em relação à comprovação de renda e autodeclaração racial. O estudo também destacou a necessidade de políticas de permanência estudantil, visto que a implementação da lei não garantiu recursos suficientes para o apoio financeiro de longo prazo aos estudantes cotistas. Nossos entrevistados observavam um papel fundamental da permanência dos estudantes no ensino superior para o sucesso das políticas de ação afirmativa.

The study aims to analyze the implementation of the Quotas Law – Law n. 12.711/12 – in four Brazilian federal universities from the perspective of Mid-Level Bureaucrats (MLBs). The methodology used was qualitative, combining analysis of university council minutes, management reports, and interviews with pro-rectors of the selected universities. Ten interviews were conducted, four of which were analyzed in this article. The research observes the challenges faced by the institutions and the arrangements made by bureaucrats during the process of implementing the legislation. The results indicate that, although the Quotas Law was widely implemented, its execution involved challenges related to the validation of student enrollment, especially regarding income verification and racial self-declaration. The study also highlighted the need for student retention policies, as the law’s implementation did not guarantee sufficient resources for long-term financial support for quota students. Our interviewees noted that student retention in higher education plays a crucial role in the success of affirmative action policies.

This work aims to investigate the experiences of Black female undergraduate students at the University of São Paulo (USP) to understand the challenges, achievements, and coping mechanisms related to their integration and persistence in the university. It highlights how their experiences of exclusion and belonging are shaped by the intersection of race, gender, and class. Through interviews conducted with Black female undergraduate students at USP, I seek to understand the adversities these students face in the academic environment, how they navigate these challenges, and how these experiences intersect with other dimensions of their lives, subjectivities, and identities. On one hand, I explore how experiences of racial discrimination, sexism, and other forms of inequality are perceived in their trajectories. On the other hand, I reflect on how participation in identity-based collectives and student organizations influences the construction of the identity and subjectivity of Black women at the university. Additionally, I examine the emotional impact of marginalization and how support networks and representation contribute to the resilience and retention of these students, elucidating the dynamics that influence their academic and personal lives.

Este trabalho tem como objetivo investigar as experiências de alunas de graduação negras da Universidade de São Paulo, a fim de compreender os desafios, conquistas e mecanismos de enfrentamento relacionados à sua inserção e permanência na universidade, destacando como suas experiências de exclusão e pertencimento são moldadas pela interseção de raça, gênero e classe. Através de entrevistas realizadas com alunas negras de graduação da USP, procuro entender por quais adversidades as estudantes negras passam no ambiente acadêmico, os modos pelos quais lidam com essas experiências e como elas se articulam com as outras dimensões de suas vidas, com as suas subjetividades e identidades. Exploro, por um lado, como as vivências de discriminação racial, machismo e outras formas de desigualdade são percebidos em suas trajetórias e, por outro, reflito em que medida participação em coletivos identitários e organizações estudantis afetam a construção da identidade e subjetividade das mulheres negras na universidade. Além disso, examino o impacto emocional da marginalização e como as redes de apoio e a representatividade contribuem para a resistência e permanência dessas estudantes, elucidando as dinâmicas que influenciam suas vidas acadêmicas e pessoais.

Abstract: The article explores the relationship between memory and technology in Bernard Stiegler's work, focusing its analysis on "tertiary retention," a form of memory externalized in technical artifacts. Technology, beyond merely storing information, reconfigures mnemotechnic processes and human identity, challenging traditional distinctions between organic and artificial memory. The digital era transforms how we remember and construct personal and collective narratives, presenting both opportunities for cognitive enrichment and risks of eroding internal memory and cultural identity. Stiegler's philosophical approach invites critical reflection on the ethical and existential implications of technology in contemporary society.

Resumen: El artículo explora la relación entre memoria y tecnología en la obra de Bernard Stiegler, centrando su análisis en la "retención terciaria", una forma de memoria externalizada en artefactos técnicos. La tecnología, más allá de almacenar información, reconfigura los procesos mnemotécnicos e identidad humana, desafiando las distinciones tradicionales entre memoria orgánica y artificial. La era digital transforma cómo recordamos y construimos narrativas personales y colectivas, presentando tanto posibilidades de enriquecimiento cognitivo, como riesgos de erosión de la memoria interna y la identidad cultural. El enfoque filosófico de Stiegler invita a una reflexión crítica sobre las implicaciones éticas y existenciales de la tecnología en la sociedad contemporánea.

The social and political history of South Africa yielded massive transformation in the higher education landscape, including access to education and the merger of universities. Despite the many successes of transformation, it brought with it challenges such as increasing participation, student retention, throughput, and graduation rates; changes in government funding models; declining student subsidies and providing quality education with limited resources. The South African higher education sector is multi-faceted, and students have a wide range of higher education options. This study explored factors influencing decision-making of first-year students when selecting a university. Data was collected from first-year students and employees at a University of Technology. Through in-depth interviews and focus group discussions, the researchers analysed the complex factors that guide students' decision-making when selecting a university. The findings revealed that factors significantly influencing decision-making on university selection are, the reputation and quality of university programmes offered, response time and support provided by staff; location; and infrastructure and facilities. This research is significant in that it will assist higher education institutions, particularly marketing and communications departments to be more responsive to students' needs by shifting toward active engagement in its marketing and recruitment approaches to attract, retain, and satisfy students.