New Applications of 3D SLAM on Risk Management Using Unmanned Aerial Vehicles in the Construction Industry

Risk Management is an integral part of the Corporate Governance of the Companies, whose objective is to estimate the risks related to each line of business and to make appropriate decisions regarding the adoption of preventive measures. The construction industry, due to its peculiar characteristics about occupational risks, is a sector that must pay particular attention to this issue. Unmanned aerial robots are part of a generation of new technologies, which are emerging in the attempt to develop robust and efficient algorithms capable of obtaining 3D models of structures under construction, to support the assessment of the situation in case of an eventuality, before the direct human intervention. This article proposes to develop a risk management strategy for the construction industry based on obtaining 3D models of work environments using drones, which will allow safe evaluation of risks present in construction zones

Rolling vesicles: From confined rotational flows to surface-enabled motion

The interaction of surfaces in relative motion in wet environments is dominated by lubrication forces, which play a pivotal role in the dynamics of microscopic systems. Here, we develop motile vesicles that exploit lubrication forces to roll on substrates. The activity of the vesicle comes from the confined rotational flow generated by a driven rotating particle encapsulated within the vesicle by droplet-microfluidics. Lubrication forces driving vesicle rolling are controlled by membrane mechanics and its tribological properties. This provides the design principles for motile vesicles that exploit frictional forces to efficiently navigate through complex environments.Comment: 6 pages, 5 figure

Estudio de un disco prehispanico de bronce del noroeste argentino

We have studied a prehispanic bronze disc of 366 mm diameter, 3.340 kg, made ca. 500-900 AD from Argentina Northwest, employing metallurgical techniques, SEM and EDS, x-ray radiography and microprobe. We found that this piece was made by melting Cu and Sn in a double matrix. It was found that the piece was well filled but with small bubles coming from the process. Metallography suggested some hammer working near some places of the disc.Se realizó un estudio de un disco prehispánico de bronce fabricado ca. 500-900 DC en el Noroeste Argentino. Empleando técnicas de caracterización de materiales determinamos que el disco es de 366 mm de diámetro y 3.340 kg, que ha sido realizado fundiendo Cu y Sn en un un molde de dos partes con un llenado cuasi-homogéneo y que en zonas aledañas a los anillos de sostén fue sometido a deformación plástica. Las técnicas de caracterización usadas fueron metalografía, SEM, EDS y radiografía industrial.Fil: Cabanillas, Edgardo Domingo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Ezeiza. Gerencia de Materiales y Combustibles Nucleares; ArgentinaFil: González, L. R.. Universidad de Buenos Aires. Facultad de Filosofía y Letras. Museo Etnográfico "Juan B. Ambrosetti"; ArgentinaFil: Palacios, Tulio Alfredo. Comisión Nacional de Energía Atómica; ArgentinaFil: Montero, R.. Comisión Nacional de Energía Atómica; ArgentinaFil: Saravia, F.. Universidad Tecnológica Nacional. Facultad Regional Buenos Aires; Argentin

Estudio de un disco prehispanico de bronce del noroeste argentino

We have studied a prehispanic bronze disc of 366 mm diameter, 3.340 kg, made ca. 500-900 AD from Argentina Northwest, employing metallurgical techniques, SEM and EDS, x-ray radiography and microprobe. We found that this piece was made by melting Cu and Sn in a double matrix. It was found that the piece was well filled but with small bubles coming from the process. Metallography suggested some hammer working near some places of the disc.Se realizó un estudio de un disco prehispánico de bronce fabricado ca. 500-900 DC en el Noroeste Argentino. Empleando técnicas de caracterización de materiales determinamos que el disco es de 366 mm de diámetro y 3.340 kg, que ha sido realizado fundiendo Cu y Sn en un un molde de dos partes con un llenado cuasi-homogéneo y que en zonas aledañas a los anillos de sostén fue sometido a deformación plástica. Las técnicas de caracterización usadas fueron metalografía, SEM, EDS y radiografía industrial.Fil: Cabanillas, Edgardo Domingo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Ezeiza. Gerencia de Materiales y Combustibles Nucleares; ArgentinaFil: González, L. R.. Universidad de Buenos Aires. Facultad de Filosofía y Letras. Museo Etnográfico "Juan B. Ambrosetti"; ArgentinaFil: Palacios, Tulio Alfredo. Comisión Nacional de Energía Atómica; ArgentinaFil: Montero, R.. Comisión Nacional de Energía Atómica; ArgentinaFil: Saravia, F.. Universidad Tecnológica Nacional. Facultad Regional Buenos Aires; Argentin

Quasi-static Eocene-Oligocene climate in Patagonia promotes slow faunal evolution and mid-Cenozoic global cooling

New local/regional climatic data were compared with floral and faunal records from central Patagonia to investigate how faunas evolve in the context of local and global climates. Oxygen isotope compositions of mammal fossils between c. 43 and 21 Ma suggest a nearly constant mean annual temperature of 16 ± 3 °C, consistent with leaf physiognomic and sea surface studies that imply temperatures of 16–18 °C. Carbon isotopes in tooth enamel track atmospheric δ 13 C, but with a positive deviation at 27.2 Ma, and a strong negative deviation at 21 Ma. Combined with paleosol characteristics and reconstructed Leaf Area Indices (rLAIs), these trends suggest aridification from 45 Ma (c. 1200 mm/yr) to 43 Ma (c. 450 mm/yr), quasi-constant MAP until at least 31 Ma, and an increase to ~ 800 mm/yr by 21 Ma. Comparable MAP through most of the sequence is consistent with relatively constant floral compositions, rLAI, and leaf physiognomy. Abundance of palms reflects relatively dry-adapted lineages and greater drought tolerance under higher p CO2 . Pedogenic carbonate isotopes imply low p CO2  = 430 ± 300 ppmv at the initiation of the Eocene–Oligocene climatic transition. Arid conditions in Patagonia during the late Eocene through Oligocene provided dust to the Southern Ocean, enhancing productivity of silicifiers, drawdown of atmospheric CO 2 , and protracted global cooling. As the Antarctic Circumpolar Current formed and Earth cooled, wind speeds increased across Patagonia, providing more dust in a positive climate feedback. High tooth crowns (hypsodonty) and ever-growing teeth (hypselodonty) in notoungulates evolved slowly and progressively over 20 Ma after initiation of relatively dry environments through natural selection in response to dust ingestion. A Ratchet evolutionary model may explain protracted evolution of hypsodonty, in which small variations in climate or dust delivery in an otherwise static environment drive small morphological shifts that accumulate slowly over geologic time.Facultad de Ciencias Naturales y Muse

Relationship between olive oil consumption and ankle-brachial pressure index in a population at high cardiovascular risk

The aim of this study was to ascertain the association between the consumption of different categories of edible olive oils (virgin olive oils and olive oil) and olive pomace oil and ankle-brachial pressure index (ABI) in participants in the PREDIMED-Plus study, a trial of lifestyle modification for weight and cardiovascular event reduction in individuals with overweight/obesity harboring the metabolic syndrome. Methods: We performed a cross-sectional analysis of the PREDIMED-Plus trial. Consumption of any category of olive oil and olive pomace oil was assessed through a validated food-frequency questionnaire. Multivariable linear regression models were fitted to assess associations between olive oil consumption and ABI. Additionally, ABI ≤1 was considered as the outcome in logistic models with different categories of olive oil and olive pomace oil as exposure. Results: Among 4330 participants, the highest quintile of total olive oil consumption (sum of all categories of olive oil and olive pomace oil) was associated with higher mean values of ABI (beta coefficient: 0.014, 95% confidence interval [CI]: 0.002, 0.027) (p for trend = 0.010). Logistic models comparing the consumption of different categories of olive oils, olive pomace oil and ABI ≤1 values revealed an inverse association between virgin olive oils consumption and the likelihood of a low ABI (odds ratio [OR] 0.73, 95% CI [0.56, 0.97]), while consumption of olive pomace oil was positively associated with a low ABI (OR 1.22 95% CI [1.00, 1.48]). Conclusions: In a Mediterranean population at high cardiovascular risk, total olive oil consumption was associated with a higher mean ABI. These results suggest that olive oil consumption may be beneficial for peripheral artery disease prevention, but longitudinal studies are needed