Large-scale impact of Saharan dust on the North Atlantic Ocean circulation

The potential for a dynamical impact of Saharan mineral dust on the North Atlantic Ocean large-scale circulation is investigated. To this end, an ocean general circulation model forced by atmospheric fluxes is perturbed by an idealized, seasonally varying, net shortwave flux anomaly, as it results from remote sensing observations of aerosol optical thickness representing Saharan dust load in the atmosphere. The dust dynamical impact on the circulation is assessed through a comparison between perturbed and an unperturbed run. Results suggest that, following the dust-induced shortwave irradiance anomaly, a buoyancy anomaly is created in the Atlantic offshore the African coast, which over the course of the time propagates westward into the interior Atlantic while progressively subducting. Changes in the large-scale barotropic and overturning circulations are significant after 3 years, which coincides with the elapsed time required by the bulk of the buoyancy perturbation to reach the western boundary of the North Atlantic. Although small in amplitude, the changes in the meridional overturning are of the same order as interannual-to-decadal variability. Variations in the amplitude of the forcing lead to changes in the amplitude of the response, which is almost linear during the first 3 years. In addition, a fast, but dynamically insignificant, response can be observed to propagate poleward along the eastern boundary of the North Atlantic, which contributes to a nonlinear response in the subpolar region north of 40°N

Malvinas-slope water intrusions on the northern Patagonia continental shelf

The Patagonia continental shelf located off southeastern South America is bounded offshore by the Malvinas Current, which extends northward from northern Drake Passage (~55° S) to nearly 38° S. The transition between relatively warm-fresh shelf waters and Subantarctic Waters from the western boundary current is characterized by a thermohaline front extending nearly 2500 km. We use satellite derived sea surface temperature, and chlorophyll-<I>a</I> data combined with hydrographic and surface drifter data to document the intrusions of slope waters onto the continental shelf near 41° S. These intrusions create vertically coherent localized negative temperature and positive salinity anomalies extending onshore about 150 km from the shelf break. The region is associated with a center of action of the first mode of non-seasonal sea surface temperature variability and also relatively high chlorophyll-<I>a</I> variability, suggesting that the intrusions are important in promoting the local development of phytoplankton. The generation of slope water penetrations at this location may be triggered by the inshore excursion of the 100 m isobath, which appears to steer the Malvinas Current waters over the outer shelf

Dual-arm dexterous mobile manipulator with new omnidirectional wheels

[ES] Este artículo describe un manipulador móvil, bimanual y con capacidad de manipulación diestra denominado MADAR (de Mobile Anthropomorphic Dual-Arm Robot). Básicamente puede dividirse en dos partes, una base móvil y una estructura superior portando dos brazos en configuración antropomorfa con manos mecánicas diestras equipadas con sensores táctiles. La base, completamente de desarrollo propio, es de forma circular y tiene tres ruedas con un diseño novedoso que permiten una movilidad omnidireccional. La estructura superior integra elementos comerciales, como los brazos, las manos y distintos sensores, que han sido adaptados para su funcionamiento conjunto. El artículo incluye tanto la descripción de los principales elementos del hardware como del software desarrollado para su control y uso.[EN] This article describes a mobile manipulator, equipped with two arms with dexterous capabilities, called MADAR (from Mobile Anthropomorphic Dual-Arm Robot). Basically, the manipulator can be divided into two parts, a mobile base and an upper structure that includes two arms with dexterous hands equipped with tactile sensors. The base, completely self-developed, is circular in shape and has three wheels with a novel design that allow omnidirectional mobility. The upper structure integrates commercial elements, such as the arms, the hands and dierent sensors. The article includes the description of the main elements of the hardware and the software developed for its control and use.Este trabajo ha sido parcialmente financiado por el gobierno español mediante el proyecto DPI2016-80077-R.Suárez, R.; Palomo-Avellaneda, L.; Martínez, J.; Clos, D.; García, N. (2020). Manipulador móvil, bibrazo y diestro con nuevas ruedas omnidireccionales. Revista Iberoamericana de Automática e Informática industrial. 17(1):10-21. https://doi.org/10.4995/riai.2019.11422OJS1021171ABB, Jan. 2018. YuMi. www.abb.com/yumi, visitado el 2019/02/12.Adascalitei, F., Doroftei, I., Jan. 2011. Practical applications for mobile robots based on mecanum wheels - a systematic survey. Romanian Review Precision Mechanics, Optics and Mechatronics, 21-29.Adept, Jan. 2018. Pioneer manipulator. https://www.generationrobots.com/media/PioneerManipulatordatasheet.pdf.Albu-Schöffer, A., Haddadin, S., Ott, C., Stemmer, A., Wimböck, T., Hirzinger, G., May 2007. The DLR lightweight robot: Design and control concepts for robots in human environments. Industrial Robot: An Int. J. 34 (5), 376-385. https://doi.org/10.1108/01439910710774386Andersen, T., 2015. Optimizing the Universal Robots ROS driver. Tech. rep., Technical University of Denmark, Department of Electrical Engineering.Arthur Ketels and M.J.G. van den Molengraft, 2014. Open ethercat society: Home of soem and soes. openethercatsociety.github.io, visitado el 2019/02/12.Batlle, J., Barjau, A., 2009. Holonomy in mobile robots. Robotics and Auton. Systems 57 (4), 433 - 440. https://doi.org/10.1016/j.robot.2008.06.001Batlle, J., Font-Llagunes, J., Barjau, A., Jan. 2010. Calibration for mobile robots with an invariant Jacobian. Robotics and Auton. Systems 58, 10-15. https://doi.org/10.1016/j.robot.2009.09.002Bischoff, R., Huggenberger, U., Prassler, E., May 2011. KUKA youBot - A mobile manipulator for research and education. In: Proc. IEEE Int. Conf. Robotics and Automation. pp. 1-4. https://doi.org/10.1109/ICRA.2011.5980575Bridgwater, L., A. Ihrke, C., Diftler, M., Abdallah, M., Radford, N., Rogers, J., Yayathi, S., S. Askew, R., M. Linn, D., 05 2012. The robonaut 2 handdesigned to do work with tools. In: Proceedings - IEEE International Conference on Robotics and Automation. pp. 3425-3430. https://doi.org/10.1109/ICRA.2012.6224772Butterfass, J., Fischer, M., Grebenstein, M., Haidacher, S., Hirzinger, G., 2004. Design and experiences with DLR hand II. In: Proc. of World Automation Congress. Vol. 15. pp. 105-110.Clos, D., Martı́nez, J., 2015. Omnidirectional wheel, and omnidirectional mobile device. World Intellectual Property Organization (Patent WO 2015/121521 A1, lens.org/084-354-767-767-633).Company, S. R., 2015. Shadow Robot Company. Shadow Dexterous Hand. [Online] http://www.shadowrobot.com.Dean-Leon, E., Pierce, B., Bergner, F., Mittendorfer, P., Ramirez-Amaro, K., Burger, W., Cheng, G., 2017. TOMM: Tactile omnidirectional mobile manipulator. In: Proc. IEEE Int. Conf. Robotics and Autom. pp. 2441-2447. https://doi.org/10.1109/ICRA.2017.7989284Fentanes, J. P., Zalama, E., Garc'ıa-Bermejo, J. G., 2012. Plataforma robótica para tareas de reconstrucci'on tridimensional de entornos exteriores. Revista Iberoamericana de Automática e Informática industrial 9 (1), 81-82. https://doi.org/10.1016/j.riai.2011.11.009Ferriere, L., Raucent, B., May 1998. ROLLMOBS, a new universal wheel concept. In: Proc. IEEE Int. Conf. Robotics and Automation. Vol. 3. pp. 1877-1882.Fitzgerald, C., Apr. 2013. Developing baxter. In: Proc. IEEE Int. Conf. Technologies for Practical Robot Appl. pp. 1-6. https://doi.org/10.1109/TePRA.2013.6556344Garcı́a, N., Rosell, J., Suárez, R., 2017. Motion planning by demonstration with human-likeness evaluation for dual-arm robots. IEEE Trans. Systems, Man, and Cybernetics: Systems PP (99), 1-10. https://doi.org/10.1109/TSMC.2017.2756856Gerum, P., 2004. Xenomai-Implementing a RTOS emulation framework on GNU/Linux. https://xenomai.org/documentation/xenomai-2.1/pdf/xenomai.pdf, visitado el 2019/05/31.Hermann, A., Sun, J., Xue, Z., Rühl, S. W., Oberländer, J., Roennau, A., Zöllner, J. M., Dillmann, R., July 2013. Hardware and software architecture of the bimanual mobile manipulation robot hollie and its actuated upper body. In: 2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM). Wollongong, NSW, Australia, pp. 286-292. https://doi.org/10.1109/AIM.2013.6584106IOC Robotics Lab, 2014. SOEM for RTNET and Xenomai. github.com/iocroblab/soem, visitado el 2019/02/12.Khatib, O., 1999. Mobile manipulation: The robotic as-sistant. Robotics and Auton. Systems 26 (2), 175 - 183. https://doi.org/10.1016/S0921-8890(98)00067-0Kröger, T., May 2011. Opening the door to new sensor-based robot applications - The Reflexxes Motion Libraries. In: IEEE Int. Conf. Robotics and Automation. pp. 1-4. https://doi.org/10.1109/ICRA.2011.5980578Kuka Robotics, 2018. KMR iiwa. www.kuka.com/en-us/products/mobility/mobile-robot-systems/kmr-iiwa, visitado el 2019/02/12.Kurazume, R., Hasegawa, T., Oct 2006. A new index of serial-link manipulator performance combining dynamic manipulability and manipulating force ellipsoids. IEEE Trans. Robotics 22 (5), 1022-1028. https://doi.org/10.1109/TRO.2006.878949Lind, M., Schrimpf, J., Ulleberg, T., 2010. Open real-time robot controller framework. In: Proc. CIRP Conf. Assembly Technology and Systems - Responsive, customer demand driven, adaptive assembly. pp. 13-18.Montaño, A., Suárez, R., 2015. Unknown object manipulation based on tactile information. In: IEEE/RSJ Int. Conf. Intelligent Robots and Systems. pp. 5642-5647. https://doi.org/10.1109/IROS.2015.7354178Montaño, A., Suárez, R., Oct 2018a. Improving grasping forces during the manipulation of unknown objects. In: 2018 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS). pp. 3490-3495. https://doi.org/10.1109/IROS.2018.8593655Montaño, A., Suárez, R., 2018b. Manipulation of unknown objects to improve the grasp quality using tactile information. Sensors 18 (5-1412). https://doi.org/10.3390/s18051412PAL Robotics, Jan. 2018. Tiago. tiago.pal-robotics.com, visitado el 2019/02/12.Pozyx NV, 2018. Creator Pozyx. www.pozyx.io, visitado el 2019/02/12.Quigley, M., Conley, K., Gerkey, B. P., Faust, J., Foote, T., Leibs, J., Wheeler, R., Ng, A. Y., 2009. Ros: an open-source robot operating system. In: ICRA Workshop on Open Source Software.Reitelshöfer, S., Ramer, C., Gräf, D., Matern, F., Franke, J., Dec. 2014. Combining a collaborative robot and a lightweight Jamming-Gripper to realize an intuitively to use and flexible co-worker. In: Proc. IEEE/SICE Int. Symp. System Integration. pp. 1-5. https://doi.org/10.1109/SII.2014.7028001Roa, M., Suárez, R., Cornellà, J., 2008. Medidas de calidad para la prensión de objetos. Revista Iberoamericana de Automática e Informatica Industrial, RIAI 5 (1), 66-82. https://doi.org/10.1016/S1697-7912(08)70124-9Rojas-de-Silva, A., Suárez, R., 2016. Grasping bulky objects with two anthropomorphic hands. In: IEEE/RSJ Int. Conf. Intelligent Robots and Systems. pp. 877-884. https://doi.org/10.1109/IROS.2016.7759154ROS-I Consortium, 2012. ROS-Industrial. rosindustrial.org/, visitado el 2019/02/12.Rosell, J., Pérez, A., Aliakbar, A., Muhayyuddin, Palomo, L., Garcı́a, N., Sept. 2014. The Kautham Project: A teaching and research tool for robot motion planning. In: Proc. IEEE Int. Conf. Emerging Technologies and Factory Automation. https://doi.org/10.1109/ETFA.2014.7005143Runge, G., Borchert, G., Raatz, A., Sept 2014. Design of a holonomic ball drive for mobile robots. In: Proc. IEEE/ASME Int. Conf. Mechatronic and Embedded Systems and Applications. pp. 1-6. https://doi.org/10.1109/MESA.2014.6935568Sadun, A. S., Jalani, J., Jamil, F., Sep. 2016. Grasping analysis for a 3-finger adaptive robot gripper. In: 2016 2nd IEEE International Symposium on Robotics and Manufacturing Automation (ROMA). pp. 1-6. https://doi.org/10.1109/ROMA.2016.7847806SCHUNK GmbH, 2011. Shunk dexterous hand - SDH2. schunk.com/us_en/gripping-systems/series/sdh/, visitado el 2019/02/12.SICK Vertriebs-GmbH, 2018. TiM5xx. www.sick.com/de/en/detection-and-ranging-solutions/2d-lidar-sensors/tim5xx/tim561-2050101/p/p369446, visitado el 2019/02/12.SimLab-Wonik Robotics, Set. 2012. Allegro hand is a low-cost and highly adaptive robotic hand. www.simlab.co.kr/Allegro-Hand.htm, visitadoel 2019/02/12.Suárez, R., Grosch, P., Jul 2004. Dexterous robotic hand ma-i, sofware and hardware architecture. In: Intelligent Manipulation and Grasping International Conference, IMG'04. pp. 91-96.Suárez, R., Rosell, J., Garcı́a, N., May 2015. Using synergies in dual-arm manipulation tasks. In: Proc. IEEE Int. Conf. Robotics and Automation. pp. 5655-5661. https://doi.org/10.1109/ICRA.2015.7139991Suárez, R., Palomo-Avellaneda, L., Martinez, J., Clos, D., Garcı́a, N., 2018.Development of a dexterous dual-arm omnidirectional mobile manipulator. IFAC-PapersOnLine 51 (22), 126 - 131, 12th IFAC Symposium on Robot Control SYROCO 2018. https://doi.org/10.1016/j.ifacol.2018.11.529SYNTENET, 2014. Projecto: Sincronización y teleoperación con interacción visual 3d de redes de manipuladores móviles y robots con articulaciones flexibles. Referencia: DPI2011-22471, Perido: 01/01/2012 al 31/12/2014, IP: Luis Basañez, IOC-UPC.Universal Robots, Feb. 2019. Ur5 collaborative robot arm. www.universal-robots.com/products/ur5-robot, visitado el 2019/02/12.Weiss Robotics, 2015. WTS-FT; Weiss Robotics GmbH&Co.KG. www.weiss-robotics.com/en/produkte/tactile-sensing/wts-ft-en/, visitado el 2019/02/12.Willow Garage, 2010. Willow Garage PR2. http://www.willowgarage.com/pages/pr2/overview, visitado el 2019/06/06

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Response of the eastern subtropical Atlantic SST to Saharan dust: A modeling and observational study

Retrievals of aerosol optical depth (AOD) from MODIS, and of sea surface temperature (SST) from TMI are analyzed jointly with the output of a numerical model for the period 2000-2006 to determine the impact of Saharan dust on the eastern subtropical North Atlantic SST. Simultaneously with, or shortly after strong dust outbreaks, a decrease in SST of 0.2 degrees to 0.4 degrees C can be observed in the microwave SST data set, which is consistent with an independent estimate of SST decrease simulated here by a local mixed layer model. However, low wind conditions and a shallow mixed layer are required to reach this response, and it is therefore unlikely that a clear response of SST to dust lasting more than a few days can be seen in the microwave SST observations. An inspection of microwave SST observations suggests that about 30% of SST variance could be explained by dust-induced cooling in our study region that is not represented in existing AVHRR SST fields nor represented in reanalysis centers-provided surface heat fluxes. On longer time scales, a comparison between observed SST fields and simulated SST, using an eddy-permitting model of the North Atlantic, suggests a cooling of about 0.5 degrees C on the local SST on sub-seasonal to interannual time scales which is significantly correlated and consistent with a dust-induced cooling. However, while supportive of the hypothesis that Saharan dust lead to a reduction in SST, the eddy-resolving model results are not by themselves conclusive. Moreover, the effects of dust-induced cooling on simulations of the ocean circulation, on atmospheric forecasts and on climate simulations remains to be investigated in future studies

The impact of the COVID-19 pandemic on Sexually Transmitted Infections surveillance data : incidence drop or artefact?

Altres ajuts: Fundacion Alfonso Martin Escudero and the Medical Research Council (grant numbers MR/K501256/1, MR/N013468/1).Background: Before the COVID-19 pandemic, Sexually transmitted infections (STIs) were increasing in Europe, and Spain and Catalonia were not an exception. Catalonia has been one of the regions with the highest number of COVID-19 confirmed cases in Spain. The objective of this study was to estimate the magnitude of the decline, due to the COVID-19 pandemic, in the number of STI confirmed cases in Catalonia during the lockdown and de-escalation phases. Methods: Interrupted time series analysis was performed to estimate the magnitude of decline in the number of STI reported confirmed cases - chlamydia, gonorrhoea, syphilis, and lymphogranuloma venereum- in Catalonia since lockdown with historical data, from March 13th to August 1st 2020, comparing the observed with the expected values. Results: We found that since the start of COVID-19 pandemic the number of STI reported cases was 51% less than expected, reaching an average of 56% during lockdown (50% and 45% during de-escalation and new normality) with a maximum decrease of 72% for chlamydia and minimum of 22% for syphilis. Our results indicate that fewer STIs were reported in females, people living in more deprived areas, people with no previous STI episodes during the last three years, and in the HIV negative. Conclusions: The STI notification sharp decline was maintained almost five months after lockdown started, well into the new normality. This fact can hardly be explained without significant underdiagnosis and underreporting. There is an urgent need to strengthen STI/HIV diagnostic programs and services, as well as surveillance, as the pandemic could be concealing the real size of the already described re-emergence of STIs in most of the European countries

Simulated changes in atmospheric dust in response to a Heinrich stadial

Heinrich stadials (HS), thought to be triggered by increased ice discharge in the high‐latitude North Atlantic at glacial periods, resulted in large freshwater forcing that weakened the Atlantic Meridional Overturning Circulation (AMOC). These events are strongly expressed in paleoclimate records throughout the Atlantic basin and much of the tropics. Compared to the Last Glacial Maximum, recent proxy data suggest HS were much drier and dustier in large parts of the tropics. We use a global climate model coupled to a prognostic dust model to examine the response of dust to changes in climate during HS. Despite some significant changes in regional precipitation patterns in response to the simulated shift in the Intertropical Convergence Zone, we find that changes in winds have a larger effect on dust mobilization and deposition patterns than soil moisture or vegetation changes associated with a weaker AMOC. Although Europe was colder and drier during HS, the annual mean glaciogenic dust emission rate is lower because a southward shift in the Northern Hemisphere jet stream leads to weaker winds and less dust mobilization. The proximity of the westerly wind anomaly associated with the jet stream shift increases gustiness and dust mobilization over northwestern Africa and shifts the African Easterly Jet southward resulting in less African dust transport and deposition over the North Tropical Atlantic. Drier conditions over the Sahel region of North Africa, however, do not lead to increased dust mobilization in our model. When we perturb Sahelian soil characteristics, our results are in better agreement with proxies. Key Points A shift in the AEJ reduces dust deposition over the North Atlantic during HS Wind changes have the largest effect on dust emission and depositio