Common aspects and differences in the behaviour of classical configuration versus canard configuration aircraft in the presence of vertical gusts, assuming the hypothesis of an elastic fuselage

The paper analyzes, in parallel, common aspects and differences in the behavior of classical configuration versus canard configuration aircraft in the presence of vertical gusts, assuming the hypothesis of an elastic fuselage. The effects of the main constructional dimensions of the horizontal empennage on lift cancelling and horizontal empennage control are being analyze

Transonic Airfoil Flow Simulation. Part II: Inviscid-Viscous Coupling Scheme

A calculation method for the subsonic and transonic viscous flow over airfoil using the displacement surface concept is described. This modelling technique uses a finite volume method for the time-dependent Euler equations and laminar and turbulent boundary-layer integral methods. In additional special models for transition, laminar or turbulent separation bubbles and trailing edge treatment have been selected. However, the flow is limited to small parts of trailing edge-type separation. Comparisons with experimental data and other methods are shown

Blowing jets as a circulation flow control to enhancement the lift of wing or generated power of wind turbine

The goal of this paper is to provide a numerical flow analysis based on RANS equations in two directions: the study of augmented high-lift system for a cross-section airfoil of a wing up to transonic regime and the circulation control implemented by tangentially blowing jet over a highly curved surface due to Coanda effect on a rotor blade for a wind turbine. This study were analyzed the performance, sensitivities and limitations of the circulation control method based on blowing jet for a fixed wing as well as for a rotating wing. Directions of future research are identified and discussed

The laminar boundary layer on a rotating wind turbine blade

The present paper describes a method to calculate velocity profiles in the boundary layer ofrotating blade. A differential approach is used to solve the laminar boundary layer equations. Theeffects of tip speed ratio, dimensionless radial position r/R and angle of attack have been analyzed.The test airfoils used in the simulations are NACA 63-215 and S809. The resulting velocity profiles inthe chordwise and spanwise directions are mapped and stored in a Database according to theboundary layer parameters

Form and Function of Clostridium Thermocellum Biofilms

The importance of bacterial adherence has been acknowledged in microbial lignocellulose conversion studies; however, few reports have described the function and structure of biofilms supported by cellulosic substrates. We investigated the organization, dynamic formation, and carbon flow associated with biofilms of the obligately anaerobic cellulolytic bacterium Clostridium thermocellum 27405. Using noninvasive, in situ fluorescence imaging, we showed biofilms capable of near complete substrate conversion with a characteristic monolayered cell structure without an extracellular polymeric matrix typically seen in biofilms. Cell division at the interface and terminal endospores appeared throughout all stages of biofilm growth. Using continuous-flow reactors with a rate of dilution (2 h1) 12-fold higher than the bacterium’s maximum growth rate, we compared biofilm activity under low (44 g/liter) and high (202 g/liter) initial cellulose loading. The average hydrolysis rate was over 3-fold higher in the latter case, while the proportions of oligomeric cellulose hydrolysis products lost from the biofilm were 13.7% and 29.1% of the total substrate carbon hydrolyzed, respectively. Fermentative catabolism was comparable between the two cellulose loadings, with ca. 4% of metabolized sugar carbon being utilized for cell production, while 75.4% and 66.7% of the two cellulose loadings, respectively, were converted to primary carbon metabolites (ethanol, acetic acid, lactic acid, carbon dioxide). However, there was a notable difference in the ethanol-to-acetic acid ratio (g/g), measured to be 0.91 for the low cellulose loading and 0.41 for the high cellulose loading. The results suggest that substrate availability for cell attachment rather than biofilm colonization rates govern the efficiency of cellulose conversion

Patterns of digital behaviour on instant messaging platforms. WhatsApp uses among young people from Romania

This paper examines the digital behaviour on one widely used instant messaging (IM) platform, namely WhatsApp, of young people in Romania, with a focus on the reasons for sharing information on the platform and dependency of using it. Within the broad framework of the digital single market, little is known about the motivations and behavioural patterns of young Europeans while using the increasingly popular IM platforms, nor is it clear whether country characteristics are relevant or not when evaluating the impact of such technological platforms on the life of young audiences. Rooted in the uses and gratifications perspective, this study uses media diaries (N = 229), filled in by young people in an ordinary day of the week and self-administered questionnaires in order to assess what might be the main gratifications that lead young and educated people to share information on WhatsApp and what makes them spend more time and be dependent on the platform on a daily basis. Main results show that the most frequent reasons why young Romanians use WhatsApp are social, professional, and instrumental. Moreover, the tendency to share content on the platform is higher for people who use it for instrumental and informative purposes. Dependency on the platform is significantly higher for young people who use it to fulfil affective needs (i.e., to express or receive affection or emotional support and avoid loneliness)

Cyber Physical Systems Oriented Robot Development Platform

AbstractThe development of systems, of various levels of complexity that can integrate physical with virtual components has become a priority for research in the context of emerging paradigms such as Cyber-Physical Systems or Internet for the Future. The authors propose a Robotic Development Platform architecture that integrates principles of Cyber-Physical Systems. The proposed architecture, is scalable, by facilitating the integration of different existing development and simulation tools and will allow robot systems to be tested in different environments, with different characteristics, and facilitate the integration of real world simulation with virtual environment simulation

A cyber-physical systems approach to cognitive enterprise

Internet of Things and Cyber-Physical Systems are paradigms that have an important influence on enterprise systems architecture and implementation. The Cognitive Manufacturing as well as the Cognitive Enterprise are emerging models, related to these paradigms, that intend to redesign in the Enterprise Information Model by integrating new information processing and problem-solving methods. This paper intends to analyses and discuss Cognitive Enterprise enablers and principles considering an approach based on models of human brain perception-reasoning-learning processes

Cutaneous Adverse Reactions to TNF Alpha Blockers. Case Report and Literature Review

Biological therapy is used in a wide range of medical settings. Adverse reactions to biological therapy can limit their widespread use, so early detection and treatment can adjust attempts to stop these molecules. TNF Alpha blockers may cause the following skin reactions in alpha patients: injection site reactions, infections, immune-mediated reactions (psoriasis, psoriasis, drug-induced lupus, vasculitis, hidradenitis, alopecia), allergic or neoplastic reactions. We present the case of a patient with RA who developed skin lesions during biological therapy and was diagnosed with drug-induced lupus based on clinical elements, associated autoimmunity, and dermatological evaluation. The skin lesions were attributed to the interaction of three medications (biosimilar Etanercept, Leflunomide, and Isoniazid), all of which have been implicated in causing these side effects. The solutions that saved the patient were temporarily discontinuing the immunosuppressive medication and replacing it with a local corticoid, followed by the continuation of Etanercept in associated with Methotrexate, and the patient was able to continue the biological medication and obtain a favorable response to the treatment. In conclusion, skin changes caused by TNF Alpha inhibitors are common, but vary in severity, and do not warrant therapy interruption