Effect of feed pressure and long-term separation performance of Pebax-ionic liquid membranes for the recovery of difluoromethane (R32) from refrigerant mixture R410A

The R410A refrigerant blend (GWP = 2088), a near azeotropic and equimass mixture of difluoromethane (R32, GWP = 675) and pentafluoroethane (R125, GWP = 3500), has been included in the HFC phase down road map established worldwide. In this context, the recovery of value-added R32 from R410A using membrane technology would be a breakthrough in the refrigeration and air conditioning sector, given that conventional distillation cannot be applied to this separation. For the first time, this work has taken advantage of the combination of ionic liquids and polymeric membranes for the separation of the constituents of the R410A mixture. Results show a remarkable improvement in terms of R32 permeability and R32/R125 selectivity in the composite membranes containing 40 wt % [C2mim][SCN] (αR32/R125 up to 14.5) and [C2mim][BF4] (αR32/R125 up to 11.0) with respect to the neat polymer membranes (αR32/R125 up to 6.9). Besides, the long-term stability was successfully tested for 25 days under high pressure conditions (7 and 12 bar), which makes these composite membranes excellent candidates for the development of membrane-based R32 separation and recovery processes.This research is supported by Project KET4F-Gas – SOE2/P1/P0823, which is co-financed by the European Regional Development Fund within the framework of Interreg Sudoe Programme, and Project PID2019-105827RB-I00, Ministerio de Ciencia e Innovación (Spain). The authors acknowledge the collaboration of Dr. Rosario Benavente (Institute of Polymer Science and Technology-CSIC) to perform the DSC experiments. Dr. Fernando Pardo, acknowledges the post-doctoral fellowship (FJCI-2017-32884, ‘Juan de la Cierva Formación’) from the Spanish Ministry of Science, Innovation and Universities

TOTAL SYNTHESES OF ALPHA-ACYLINDOLE ALKALOIDS - (+)6-OXOSILICINE AND (+) 16,20-EPIN(A)-METHYLERVATAMINE

3491363136

Annual, seasonal and spatial variation of abundance of the shrimp Artemesia longinaris (Decapoda : Penaeoidea) in south-eastern Brazil

The influence of several environmental factors oil the abundance and spatial-temporal distribution of the shrimp Artemesia longinaris were investigated from January 1998 to December 1999 in the Ubatuba region of São Paulo State, Brazil. Collections were performed monthly in the bays of Ubatumirim (UBM), Ubatuba (UBA) and Mar Virado (MV). Six sampling transects were estabilshed in each bay, four were parallel to the shore line, and two were next to the rocky shores. A commercial shrimp fishing boat equipped with two 'double-rig' nets was used. A total of 11,503 individuals was collected, including 1633 from UBM, 6344 from UBA and 3526 from MV the majority of the captured specimens came from the deeper areas (15 to 20 m) with high salinity (34 to 36 ppt). The highest abundance of A. longinaris in Ubatuba bay was recorded in areas where fine and very fine sand comprised more than 70% of the sediment. Moreover, the abundance of A. longinaris followed a seasonal trend, being higher during the summer, when intrusions of cold South Atlantic Coastal Waters (SACW) are frequent. Thus, type of sediment, temperature and salinity are determinant factors in the distribution of A. longinaris in the studied region

Avaliação da implantação do Método Canguru por gestores, profissionais e mães de recém-nascidos Evaluation of the implementation of Kangaroo Care by health administrators, professionals, and mothers of newborn infants

Trata-se de estudo de avaliação qualitativa que buscou compreender dificuldades e facilidades da implantação do Método Canguru em maternidades brasileiras capacitadas pelo Ministério da Saúde sob a ótica de profissionais de saúde, gestores e mães de recém-nascidos de baixo peso atendidos nesses serviços. Realizaram-se entrevistas semiestruturadas durante visita in loco as maternidades. Utilizou-se a análise estrutural de narração como método de análise dos dados. Os principais núcleos avaliativos centrais identificados foram: importância do método para a assistência ao recém nascido; importância do apoio institucional para a sustentabilidade do método. Para o aprofundamento da reflexão sobre os resultados encontrados, o referencial teórico da análise institucional foi fundamental. Apesar das resistências, a institucionalização do método está sendo realizada nas maternidades, porém, há necessidade de se manter capacitações periódicas e de se alocar maiores recursos que permitam melhorar a infraestrutura dos serviços, refletindo na humanização do cuidado de forma mais efetiva.<br>This was a qualitative evaluation study aimed at both shedding light on the challenges and facilitating implementation of Kangaroo Care in Ministry of Health-accredited maternity care facilities in Brazil, from the standpoint of healthcare professionals and administrators and mothers of low birth weight newborns. Semi-structured on-site interviews were conducted at the maternity centers. The study used structural narrative analysis with the data analysis method. Key evaluative focal points identified were the method's importance in neonatal care and institutional support for its sustainability. As for the findings, the theoretical concept of institutional analysis was essential for achieving more in-depth reflection. Despite some resistance, the method is being implemented effectively in maternity care facilities; however, the study shows the need for periodic training and more resource allocation to enable improvement in the service's infrastructure, thereby resulting in more effective humanization of care