Bio-hythane production from food waste by dark fermentation coupled with anaerobic digestion process: A long-term pilot scale experience

In this paper are presented the results of the investigation on optimal process operational conditions of thermophilic dark fermentation and anaerobic digestion of food waste, testing a long term run, applying an organic loading rate of 16.3 kgTVS/m3d in the first phase and 4.8 kgTVS/m3d in the second phase. The hydraulic retention times were maintained at 3.3 days and 12.6 days, respectively, for the first and second phase. Recirculation of anaerobic digested sludge, after a mild solid separation, was applied to the dark fermentation reactor in order to control the pH in the optimal hydrogen production range of 5-6. It was confirmed the possibility to obtain a stable hydrogen production, without using external chemicals for pH control, in a long term test, with a specific hydrogen production of 66.7 l per kg of total volatile solid (TVS) fed and a specific biogas production in the second phase of 0.72 m3 per kgTVS fed; the produced biogas presented a typical composition with a stable presence of hydrogen and methane in the biogas mixture around 6 and 58%, respectively, carbon dioxide being the rest

Discursos hibridos nas memorias de licenciaturas em ciencias

Orientador : Maria Ines de Freitas Petrucci dos Santos RosaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de EducaçãoResumo: Esse trabalho investiga as memórias de uma instituição universitária com tradição em formação docente no que se refere aos processos de reformulação curricular da última década. Para isso, foram entrevistados professores e professoras dos programas de licenciaturas em ciências, numa perspectiva metodológica afinada com a noção de rememoração e de narrativa em W. Benjamin. Os discursos produzidos durante a reconfiguração curricular das licenciaturas em questão, evidenciaram hibridismos produzidos nos campos disciplinares em disputa no currículo em transformaçãoAbstract: This work investigates memories of a university with tradition in teacher education about the curricular changes happened during the last decade. For this, professors of the science teacher education programs had been interviewed, in a methodological approach sharpened through the notion of remember and narrative by W. Benjamin. These speeches had evidenced hybridism of discourses produced in the disciplinar fields which dispute space during curricular changeMestradoEnsino e Práticas CulturaisMestre em Educaçã

Detecting dynamic domains and local fluctuations in complex molecular systems via timelapse neighbors shuffling

Many complex molecular systems owe their properties to local dynamic rearrangements or fluctuations that, despite the rise of machine learning (ML) and sophisticated structural descriptors, remain often difficult to detect. Here we show an ML framework based on a new descriptor, named Local Environments and Neighbors Shuffling (LENS), which allows identifying dynamic domains and detecting local fluctuations in a variety of systems via tracking how much the surrounding of each molecular unit changes over time in terms of neighbor individuals. Statistical analysis of the LENS time-series data allows to blindly detect different dynamic domains within various types of molecular systems with, e.g., liquid-like, solid-like, or diverse dynamics, and to track local fluctuations emerging within them in an efficient way. The approach is found robust, versatile, and, given the abstract definition of the LENS descriptor, capable of shedding light on the dynamic complexity of a variety of (not necessarily molecular) systems

Human immunodeficiency virus and sexually transmitted disease disparities among transgender persons

Experiencies of transphobic discrimination and victimization negatively impact on mental health, and the lack of social support has been found to be associated with a higher rate of undiagnosed HIV infection. To accurately assess the prevalence of HIV infection and other sexually transmitted diseases in the transgender population it is essential to create centres that can offer a comprehensive, multidisciplinary and adequate support to these patients

TimeSOAP: Tracking high-dimensional fluctuations in complex molecular systems via time variations of SOAP spectra

Many molecular systems and physical phenomena are controlled by local fluctuations and microscopic dynamical rearrangements of the constitutive interacting units that are often difficult to detect. This is the case, for example, of phase transitions, phase equilibria, nucleation events, and defect propagation, to mention a few. A detailed comprehension of local atomic environments and of their dynamic rearrangements is essential to understand such phenomena and also to draw structure-property relationships useful to unveil how to control complex molecular systems. Considerable progress in the development of advanced structural descriptors [e.g., Smooth Overlap of Atomic Position (SOAP), etc.] has certainly enhanced the representation of atomic-scale simulations data. However, despite such efforts, local dynamic environment rearrangements still remain difficult to elucidate. Here, exploiting the structurally rich description of atomic environments of SOAP and building on the concept of time-dependent local variations, we developed a SOAP-based descriptor, TimeSOAP (τSOAP), which essentially tracks time variations in local SOAP environments surrounding each molecule (i.e., each SOAP center) along ensemble trajectories. We demonstrate how analysis of the time-series τSOAP data and of their time derivatives allows us to detect dynamic domains and track instantaneous changes of local atomic arrangements (i.e., local fluctuations) in a variety of molecular systems. The approach is simple and general, and we expect that it will help shed light on a variety of complex dynamical phenomena