Because of the significant environmental impact that the concrete production causes, and as sustainability contribution for this industry; presently some improvements are being implemented in its ...durability and its components are been replaced for alternative recyclable materials. Concrete carbonation is one of the main causes of reinforcement electrochemical corrosion. Coarse Recycled Concrete Aggregates (RCA) and Supplementary Cementing Materials (SCM) such as fly ash and silica fume were used to produce durable and environmentally friendly concrete and for the evaluation of its carbonation depth and carbonation-induced reinforcement corrosion when it is exposed to accelerated conditions. The depth of carbonation was observed by spraying a phenolphthalein solution on the fresh broken concrete surface. The corrosion rates of steel embedded in these concretes have been measured by the lineal polarization resistance technique. The results indicate that to use RCA and SCM increase the carbonation depth and corrosion current density.
It is planned to improve the durability of reinforced concrete structures and the total or partial replacement of their components by the use of recyclable materials; as strategies to contribute to ...the concrete industry sustainability. The electrical resistivity and its relationship with the microstructure and electrochemical corrosion resistance in reinforced concrete manufactured with sustainable characteristics, that is, with recycled aggregates and supplementary cementitious materials; was evaluated in this study. The electrical resistivity in reinforced concretes is closely related to the microstructure of the cementitious matrix, and with the pore structure and distribution. As a consequence of the their components nature, it is assumed that the proposed sustainable concretes present different microstructure and porosity than the conventional concretes; because of this, the electrical and electrochemical response of those systems was analyzed with the help of the electrochemical impedance spectroscopy technique.
Process mining techniques are able to extract knowledge from event logs commonly available in today's information systems. These techniques provide new means to discover, monitor, and improve ...processes in a variety of application domains. There are two main drivers for the growing interest in process mining. On the one hand, more and more events are being recorded, thus, providing detailed information about the history of processes. On the other hand, there is a need to improve and support business processes in competitive and rapidly changing environments. This manifesto is created by the IEEE Task Force on Process Mining and aims to promote the topic of process mining. Moreover, by defining a set of guiding principles and listing important challenges, this manifesto hopes to serve as a guide for software developers, scientists, consultants, business managers, and end-users. The goal is to increase the maturity of process mining as a new tool to improve the (re)design, control, and support of operational business processes.
Cytological analysis of 16 individuals of Ornithogalum montanum (Liliaceae) have shown a constant diploid chromosome number (2n = 18) and polymorphism in the nucleolar chromosomes. We have identified ...four different karyotypes depending of NOR morphology. In nine individuals, with homomorphic nucleolar chromosomes, the rDNA content varies from 0.098% to 0.142%. In three individuals, with an heteromorphic intercalary trabant, the rDNA content varies from 0.116% to 0.136%. In three other individuals, an extra dense chromatic segment is present in one of the nucleolar chromosomes, while the homologous chromosome is lacking the intercalaty trabant; the rDNA content is clearly higher (0.172%, 0.191% and 0.214%). In another individual we found the extra chromatic segment only in one of the nucleolar chromosomes; the rDNA content is 0.168%.
The correlation between the presence of the extra chromatic segment and higher rDNA content, together with the results of the N-banding, indicates that most of ribosomal genes, if not all, are located in this species within the nucleolar secondary constriction.
