12456 research outputs found
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Respuesta morfodinámica de las playas del caribe colombiano ante eventos extremos de oleaje
No full textEn este espacio propiciado por el Departamento de Ciencias Naturales y Exactas, se habla primeramente del oleaje, las tormentas y los daños que pueden causar en la zona costera. La investigación está basada en los indicios de los cambios morfológicos en las tormentas, para eso se analiza la clasificación del oleaje en las costas. Los estudios de erosión, inundación, huracanes y retrocesos en frentes fríos fueron realizados en las playas de Bocagrande y costa verde. Finalmente, se explican algunas prospectivas de mejora-evolución y se escuchan las preguntas de los participantes
An analysis of nanoparticles derived from coal fly ash incorporated into concrete
No full textThe environmental benefits of incorporating coal fly ash (CFA) into the concrete manufacturing process as a partial substitute for Portland cement are well known. What is less studied is the potential release of CFA derived nanomineral and amorphous nanoparticles during this process of incorporation. A thorough understanding of this makes it possible to understand the risks of exposure to particulates that are harmful to human health when CFA is mixed into concrete. The general objective of this study is to analyze airborne particulates released when CFA is mixed into concrete at the point of manufacture, focusing on the levels of nanominerals, amorphous nanoparticles and hazardous elements (HEs) contained within that are considered harmful to human health. These airborne particulates can be easily inhaled by plant workers in the absence of personal protective equipment. The authors analyzed samples of ash itself and collected actual airborne particulates using self-made passive samplers installed at the manufacturing plant. Regarding the ash analyzed, iron (Fe) was found in large amounts in relation to calcium (Ca), magnesium (Mg) and silicon (Si). The transport, disposal and application of CFA in civil construction projects can provide an increased efficiency and reduce overall costs associated with the production of concrete. However, CFA poses a threat to human health due to the significant amount of HEs, nanominerals, and amorphous nanoparticles found to be released into the environment at the manufacturing plant
Only “yes” means “yes”: negotiation of sex and its link with sexual violence
No full textLack of consent is an essential characteristic of sexual violence. The present study was conducted to analyze the relation between sexual consent and the risk of perpetrating sexual aggression by men and victimization suffered by women in more depth. The sample consisted of 1681 heterosexual Spanish men and women aged 18–66 years. The participants completed an online survey containing the Spanish versions of the Sexual Consent Scale Revised and the Sexual Experiences Survey. The results showed that 70.2% of the women had been sexual victims, and 20.8% of men reported having perpetrated sexual violence. On the one hand, sexual aggressors, unlike non aggressors, underestimated the relevance of obtaining sexual consent, and more aggressors reported lack of perceived behavioral control for requesting sexual consent and endorsed less positive attitudes to obtain sexual consent than non aggressors. On the other hand, sexual victims, compared to non victims, considered requesting explicit sexual consent relevant, but held certain ideas, attitudes, and behaviors that did not go along with obtaining sexual consent, which leaves women in a position of vulnerability
Integrated analogical signs generator for testing mixed integrated circuits
No full textThis paper presents the design of a functional block for testing analog and mixed-signal integrated circuits. The objective is that this functional block is embedded into an integrated circuit, IC, to generate the stimuli of the analog functional blocks. The result is a simple block with the ability to generate analog stimuli, as evidenced in the simulations carried out
Sustainable local development: consolidated framework for cross-sectoral cooperation via a systematic approach
No full textCross-sectoral cooperation (CSC) has gained recognition as the key to achieving sustainable development goals within a locality. However, existing studies focused on sustainable local development (SLD) initiatives resulting from CSC remain sparse. This article aims to review the CSC–SLD literature, using the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) method. Research questions were constructed using the PICOC (population, intervention, comparison, outcomes, and context) structure. The identification of scientific works occurred through the search of relevant keywords, which resulted in a final set of 38 peer-reviewed manuscripts, from 1994 to 2021. First, the main driving forces for adopting CSC, to achieve SLD, which are dispersed at multiple levels, were captured and contextualised into the micro-, meso-, macro- and mega-framework. Second, salient aspects addressed in the literature for effective CSC implementation were identified and classified into approaches, governance, structure, key actors, psychological and social aspects, and experiences themes. This resulted in a consolidated guiding principles framework for implementing CSC, to pursue SLD. Additionally, the use of theories in different aspects of CSC–SLD initiatives was discussed. This study informs the practitioners, policy-makers, and researchers the fundamentals that need to be considered when planning, designing, and implementing effective CSC interventions for SLD
Criticalidad y estructura fractal de cascadas turbulentas - 5/3
No full textEn este espacio propiciado por el Departamento de Ciencias Naturales y Exactas, se describe detalladamente los tipo de remolinos, torbellinos, turbulencias y cascadas; se centra principalmente en el fenómeno de cascadas y turbulencias y la intermitencia de velocidad en cada uno de ellos. Se explica el modelo creado para medir con claridad el fenómeno de cascadas de energía, el cual es llamado: "Modelar cascadas con un sistema que es capaz de hacer intermitencia "también conocido como (DRM). Finalmente se da una breve definición sobre qué es una turbulencia y la diferencia entre remolinos pequeños y remolinos grandes
Improved metaheuristics with machine learning enabled medical decision support system
No full textSmart healthcare has become a hot research topic due to the contemporary developments of Internet of Things (IoT), sensor technologies, cloud computing, and others. Besides, the latest advances of Artificial Intelligence (AI) tools find helpful for decision-making in innovative healthcare to diagnose several diseases. Ovarian Cancer (OC) is a kind of cancer that affects women’s ovaries, and it is tedious to identify OC at the primary stages with a high mortality rate. The OC data produced by the Internet of Medical Things (IoMT) devices can be utilized to differentiate OC. In this aspect, this paper introduces a new quantum black widow optimization with a machine learning-enabled decision support system (QBWO-MLDSS) for smart healthcare. The primary intention of the QBWO-MLDSS technique is to detect and categorize the OC rapidly and accurately. Besides, the QBWO-MLDSS model involves a Z-score normalization approach to pre-process the data. In addition, the QBWO-MLDSS technique derives a QBWO algorithm as a feature selection to derive optimum feature subsets. Moreover, symbiotic organisms search (SOS) with extreme learning machine (ELM) model is applied as a classifier for the detection and classification of ELM model, thereby improving the overall classification performance. The design of QBWO and SOS for OC detection and classification in the smart healthcare environment shows the study’s novelty. The experimental result analysis of the QBWO-MLDSS model is conducted using a benchmark dataset, and the comparative results reported the enhanced outcomes of the QBWO-MLDSS model over the recent approaches.United State
Resolución 0777 de 2022
No full textQue mediante la Ley 2162 de 2021 se creó el Ministerio de Ciencia, Tecnología e Innovación como ente rector de la política de ciencia, tecnología e innovación que genere capacidades, promueva el conocimiento científico y tecnológico, contribuya al desarrollo y crecimiento del país y se anticipe a los retos tecnológicos futuros, siempre buscandoelbienestar de los colombianos y consolidar una economía más productiva y competitiva y una sociedad más equitativa
The cumulative effect of fibromyalgia symptoms on cognitive performance: the mediating role of pain
No full textFibromyalgia (FMS) is a chronic condition that encompasses widespread pain associated with cognitive impairment and significant emotional distress related to functional disability. This study aimed to obtain evidence of the role of pain in the effect of time since FMS diagnosis and cognitive performance using a novel online protocol of neuropsychological evaluation since the COVID-19 pandemic has challenged traditional neuropsychology testing leading to the need for novel procedures transitioning to tele-neuropsychology. A sample of 70 adult women was evaluated (50 with FMS and 19 controls) using online questionnaires that evaluated pain and executive functioning (impulsivity, inhibition control, monitoring, and planning). Afterward, participants were evaluated by trained neuropsychologists in a 30 min online session using virtually adapted cognitive tests: the Hopkins Verbal Learning Test (memory), the Symbol-Digit Modalities Test (attention and speed processing), the F-A-S test (verbal fluency), and Digit Span tests (working memory). We found that the time of FMS diagnosis has an effect on cognitive functioning predominantly mediated by pain. Our results point out the role of pain as a mediator on cognitive performance, specifically in executive functions which are directly affected by the cumulative effect of the time of diagnosis. Furthermore, the importance of considering a broader perspective for assessment and treatment including novel procedures via tele-neuropsychology
Two sides of the same coin: ADHD affects reactive but not proactive inhibition in children
No full textChildren with attention-deficit/hyperactivity disorder (ADHD) present a deficit in inhibitory control. Still, it remains unclear whether it comes from a deficit in reactive inhibition (ability to stop the action in progress), proactive inhibition (ability to exert preparatory control), or both. We compared the performance of 39 children with ADHD and 42 typically developing children performing a Simon choice reaction time task. The Simon task is a conflict task that is well-adapted to dissociate proactive and reactive inhibition. Beyond classical global measures (mean reaction time, accuracy rate, and interference effect), we used more sophisticated dynamic analyses of the interference effect and accuracy rate to investigate reactive inhibition. We studied proactive inhibition through the congruency sequence effect (CSE). Our results showed that children with ADHD had impaired reactive but not proactive inhibition. Moreover, the deficit found in reactive inhibition seems to be due to both a stronger impulse capture and more difficulties in inhibiting impulsive responses. These findings contribute to a better understanding of how ADHD affects inhibitory control in children