Generating the DHCP config file using confDB

The present note describes a method to generate the dhcp config file using the information contained in the configuration database. It also presents how it can be used according to the network topology

Configuring the LHCb readout network using a database

The LHCb readout system is composed of hundreds of electronic boards, an event-building network based on Gigabit Ethernet switches and an online processing farm. The Experiment Control System (ECS) configures the system from the Online Configuration database. This database contains device parameters, the hierarchical structure and the connectivity information of the system. In addition the switches in the event-building network require routing tables that have to be generated according to the connectivity. We apply the Entity Relationship model to represent the connectivity of the system. SQL code builds the routing tables using the information contained in the Configuration database

Electromagnetic follow-up of gravitational wave transient signal candidates

Pioneering efforts aiming at the development of multi-messenger gravitational wave and electromagnetic astronomy have been made. An electromagnetic observation follow-up program of candidate gravitational wave events has been performed (Dec 17 2009 to Jan 8 2010 and Sep 4 to Oct 20 2010) during the recent runs of the LIGO and Virgo gravitational wave detectors. It involved ground-based and space electromagnetic facilities observing the sky at optical, X-ray and radio wavelengths. The joint gravitational wave and electromagnetic observation study requires the development of specific image analysis procedures able to discriminate the possible electromagnetic counterpart of gravitational wave triggers from contaminant/background events. The paper presents an overview of the electromagnetic follow-up program and the image analysis procedures.Comment: Proceedings of the 12th International Conference on "Topics in Astroparticle and Underground Physics" (TAUP 2011), Munich, September 2011 (to appear in IoP Journal of Physics: Conference Series

IMPACTS DE VAGUE PAR RUPTURE DE BARRAGE SUR FOND MOUILLÉ WAVE IMPACTS IN WET DAM BREAKING

International audienceCet article présente l'analyse de la typologie des impacts de vagues générées par la rupture d'un barrage sur fond mouillé, en mettant l'accent sur l'impact flip-through. Dans lesétudes précédentes, ce type d'impact s'est avéré très difficileà obtenir età répéter expérimentalement, car il nécessite un ajustement très précis des paramètres du problème. Dans la présenteétude, un modèle numérique de rupture de barrage a d'abordété validé sur la base de résultats expérimentaux antérieurs, puis utilisé pourétudier les impacts de vagues sur un mur dont la position peutêtre ajustée. Les caractéristiques de plus de cinq cents cas d'impact ont ainsi puêtreétudiées. Quatre types d'impacts (impacts de ballottement, impacts flip-through, impacts de poches d'air et impacts aérés) ontété identifiés en fonction des paramètres du modèle de rupture de barrage. Les caractéristiques cinématiques et dynamiques de ces différents impacts sontétudiées dans ce travail. Summary This paper focuses on the analysis of the wave impact typology generated in wet dam breaking with a focus on the flip-through impact. In previous studies, this kind of impact has been proven to be very hard to obtain and repeat experimentally as it requires a very precise adjustment of the parameters. In the present study, a numerical model of the wet dam break flow was first validated on the basis of previous experimental results and then used to study the wave impacts on a wall, whose position can be adjusted. The features of more than five hundred impact cases could thereby be studied. Four types of impacts (sloshing impacts, flip-through impacts, air pocket impacts and aerated impacts) were identified and investigated in relation with the parameters of the dam-break model. The kinematic and dynamic characteristics of these different impacts are finally studied in this work

Enhancing gravitational wave astronomy with galaxy catalogues

Joint gravitational wave (GW) and electromagnetic (EM) observations, as a key research direction in multi-messenger astronomy, will provide deep insight into the astrophysics of a vast range of astronomical phenomena. Uncertainties in the source sky location estimate from gravitational wave observations mean follow-up observatories must scan large portions of the sky for a potential companion signal. A general frame of joint GW-EM observations is presented by a multi-messenger observational triangle. Using a Bayesian approach to multi-messenger astronomy, we investigate the use of galaxy catalogue and host galaxy information to reduce the sky region over which follow-up observatories must scan, as well as study its use for improving the inclination angle estimates for coalescing binary compact objects. We demonstrate our method using a simulated neutron stars inspiral signal injected into simulated Advanced detectors noise and estimate the injected signal sky location and inclination angle using the Gravitational Wave Galaxy Catalogue. In this case study, the top three candidates in rank have $72\%$, $15\%$ and $8\%$ posterior probability of being the host galaxy, receptively. The standard deviation of cosine inclination angle (0.001) of the neutron stars binary using gravitational wave-galaxy information is much smaller than that (0.02) using only gravitational wave posterior samples.Comment: Proceedings of the Sant Cugat Forum on Astrophysics. 2014 Session on 'Gravitational Wave Astrophysics

An autonomic approach to configure HEP (High Energy Physics) experiments, applied to LHCb (Large Hadron Collider beauty)

Properly configuring an HEP (High Energy Phys ics) experiment becomes a more and more complex task as the number of electronics modules grows and technologies evolve quickly. Anticipating a fault in the software or in the hardware during the configuration or the data taking requires an adaptive and modular control system. The introduction of autonomic tools and data bases in the HEP world is quite recent and contributes to implement a more reliable system . The LHCb control system innovates as it has been built using autonomic tools. The main contribution of this PhD is the implementation of an autonomic 3-Tier architectur e to configure the LHCb experiment which is a huge network of devices of different types, and its integrat ion in the control system. This new type of autonomics architecture consists of: • A database layer. A relational Oracle databa se implemented using the Oracle technology contains the information required for c onfiguration, namely about configuration parameters, the connectivity of the experiment and the inventory/history of devices. A method based on prime numbers has been introduced to replace a N:M relationship. PL/SQL applications have been built to auto mate several steps in the configuration. • An object layer. A set of smart libraries has been written to allow manipulating the information stored in the database in a safe and consistent manner and without any knowledge of the database table schema. • A GUI layer. Users view and modify the co ntent of the database using user-friendly graphical interfaces. Each layer has been tested a nd validated. The behaviour of th e whole architecture and its integration in the control system ha ve also been tested successfully

Flight delays in Germany: a model for evaluation of future cost risk

Air traffic has been increasing in Germany over the last decades reaching in 2018 an all-time high with more than 3 million flights. This increase has led to a rise in delays, which generate different costs to airlines, passengers, and Air Navigation Service Providers. This paper focuses on understanding and predicting these costs. For this purpose, a stochastic modelling method is proposed to estimate future air traffic, delays and the cost of future delays. The model allows to better understand what the full distribution of the delay costs may look like. To that end, the paper analyses 1,826 daily items (from 1/1/2014 to 12/31/2018) with information of air traffic and delays for German airspace. Findings suggest that overall mean delay costs for 2019 may be up to 280 million €, while in the 5% worst cases this value could go up to an average of 319 million €. © 2022 Luis Mª Abadie, Ibon Galarraga, Itziar Ruiz-Gauna.This research is supported by the Basque Government through the BERC 2018-2021 program and by the Spanish Ministry of Economy and Competitiveness MINECO through BC3 María de Maeztu excellence accreditation MDM-2017-0714

Data-driven modeling for drop size distributions

The prediction of the drop size distribution (DSD) resulting from liquid atomization is key to the optimization of multiphase flows from gas-turbine propulsion through agriculture to healthcare. Obtaining high-fidelity data of liquid atomization, either experimentally or numerically, is expensive, which makes the exploration of the design space difficult. First, to tackle these challenges, we propose a framework to predict the DSD of a liquid spray based on data as a function of the spray angle, the Reynolds number, and the Weber number. Second, to guide the design of liquid atomizers, the model accurately predicts the volume of fluid contained in drops of specific sizes while providing uncertainty estimation. To do so, we propose a Gaussian process regression (GPR) model, which infers the DSD and its uncertainty form the knowledge of its integrals and of its first moment, i.e., the mean drop diameter. Third, we deploy multiple GPR models to estimate these quantities at arbitrary points of the design space from data obtained from a large number of numerical simulations of a flat fan spray. The kernel used for reconstructing the DSD incorporates prior physical knowledge, which enables the prediction of sharply peaked and heavy-tailed distributions. Fourth, we compare our method with a benchmark approach, which estimates the DSD by interpolating the frequency polygon of the binned drops with a GPR. We show that our integral approach is significantly more accurate, especially in the tail of the distribution (i.e., large, rare drops), and it reduces the bias of the density estimator by up to 10 times. Finally, we discuss physical aspects of the model's predictions and interpret them against experimental results from the literature. This work opens opportunities for modeling drop size distribution in multiphase flows from data

Train Like an Astronaut Educational Outreach

In an effort to reduce the incidence of childhood obesity, the National Aeronautics and Space Administration (NASA), capitalizing on the theme of human spaceflight developed two educational outreach programs for children ages 8-12. To motivate young "fit explorers," the Train Like an Astronaut National (TLA) program and the Mission X: Train Like an Astronaut International Fitness Challenge (MX) were created. Based on the astronauts' physical training, these programs consist of activities developed by educators and experts in the areas of space life sciences and fitness. These Activities address components of physical fitness. The educational content hopes to promote students to pursue careers in science, technology, engineering, and math (STEM) fields. At the national level, in partnership with First Lady Michelle Obama's Let?s Move! Initiative, the TLA program consists of 10 physical and 2 educational activities. The program encourages families, schools, and communities to work collaboratively in order to reinforce in children and their families the importance of healthy lifestyle habits In contrast, the MX challenge is a cooperative outreach program involving numerous space agencies and other international partner institutions. During the six-week period, teams of students from around the world are challenged to improve their physical fitness and collectively accumulate points by completing 18 core activities. During the 2011 pilot year, a t otal of 137 teams and more than 4,000 students from 12 countries participated in the event. MX will be implemented within 24 countries during the 2012 challenge. It is projected that 7,000 children will "train like an astronaut"

Social determinants of HIV/HCV co-infection: A case study from people who inject drugs in rural Puerto Rico

Worldwide there are an estimated 130 million people infected with hepatitis C (HCV), 40 million living with HIV, and between 4 and 5 million co-infected with HIV and HCV (Alter, 2006; Perz, Farrington, Pecoraro, Hutin, & Armstrong, 2004; WHO. AIDS epidemic update, 2004). In Western Europe and the United States, co-infection tends to concentrate among people who inject drugs (PWID) mainly driven by blood contained in shared syringes and contaminated injection equipment (Hahn, Page-Schafer, Lum, et al., 2002; Doerrbecker, Behrendt, Matheu-Gelabert et al., 2013). Epidemiological data shows wide discrepancies in HIV/HCV prevalence among PWID across the world (Bao & Li, 2009; Rahimi-Movaghar, Razaghi, Sahim-Izadian, & Amin-Esmaeili, 2010). In Western Europe some studies involving HIV positive individuals with a history of injection drug use documented a HIV/HCV co-infection rate of around 66%,while similar studies conducted on positive HIV patientswho inject drugs enrolled in a large HIV clinical trial showed that between 72%–95% were co-infected with HCV (Denis et al., 1997; Roca et al., 2003; Sherman, Rouster, Chung, & Rajicic, 2002; Sulkowski & Thomas, 2003)