55 research outputs found
Design proposal and optimization potential for an electric drive motor in a 50 PAX hybrid-electric regional aircraft application
No full textElectric propulsion systems are considered one possibility to reach the ambitious goals of the European Union’s Flightpath 2050 concerning greenhouse gas emissions and noise. This paper proposes an engineering architecture design of an electric motor for a propulsion system in a hybrid-electric regional aircraft. The project partners defined the performance requirements for the thrust of the propulsion system. The electric drive motor for the propellers was calculated and then simulated. The motor is specified in this paper, with the materials possible for construction
Experimental correlation of forced convection heat transfer from a NACA airfoil
No full textThe results of an experimental investigation of the heat transfer coefficients for forced convection from a NACA-63421 airfoil are presented. Wind tunnel measurements of convection coefficients are obtained for air flow temperatures from −30 to 20 °C. The experimental data is correlated with respect to the Nusselt and Reynolds numbers. Conduction within the airfoil balances heat transfer by convection from the airfoil surface in steady-state conditions. Both average and spatial variations of the heat transfer coefficients are non-dimensionalized through modifications of a classical Hilpert correlation for cylinders in crossflow. It is shown that the functional form of the Hilpert correlation can effectively accommodate measured data for the NACA airfoil over a range of Reynolds numbers. An uncertainty analysis is performed to yield a 7.34% measurement uncertainty for experimental data correlated with the Nusselt number.Natural Sciences and Research Council of Canada (NSERC)Manitoba HydroCanada Foundation for Innovation (CFI
The dolphin proline-rich antimicrobial peptide Tur1A inhibits protein synthesis by targeting the bacterial ribosome
No full textProline-rich antimicrobial peptides (PrAMPs) internalize into susceptible bacteria using specific transporters and interfere with protein synthesis and folding. To date, mammalian PrAMPs have so far only been identified in artiodactyls. Since cetaceans are co-phyletic with artiodactyls, we mined the genome of the bottlenose dolphin Tursiops truncates, leading to the identification of two PrAMPs, Tur1A and Tur1B. Tur1A, which is orthologous to the bovine PrAMP Bac7, is internalized into E. coli without damaging the membranes using the inner membrane transporters SbmA and YjiL/MdM. Furthermore, like Bac7, Tur1A also inhibits bacterial protein synthesis by binding to the ribosome and blocking the transition from the initiation to the elongation phase. By contrast, Tur1B is a poor inhibitor of protein synthesis and may utilize another mechanism of action. An X-ray structure of Tur1A bound within the ribosomal exit tunnel provides a basis to develop these peptides as novel antimicrobial agents
Contrastive negation: Constructional variation within and across languages
No full textLectio praecursoria
The author defended his doctoral dissertation Contrastive Negation: Constructional Variation within and across Languages at the Faculty of Arts, University of Helsinki, on 18 October 2019. The opponent at the public defence was Professor Martin Hilpert (Université de Neuchâtel), and the defence was chaired by Professor Matti Miestamo (University of Helsinki). The introduction and conclusion of the article-based dissertation can be found at http://urn.fi/URN:ISBN:978-951-51-5527-6
NEGATIVE ION CHEMICAL IONIZATION MASS SPECTROMETRY OF POLYCYCLIC AROMATIC HYDROCARBONS
No full textThe negative ion chemical ionization (NICI) mass spectrometry of thirty-nine polycyclic aromatic hydrocarbons (PAH) was investigated. The methane NICI mass spectra of PAH are dominated by the molecular anion for species which show high NICI sensitivity, and by the molecular anion plus adduct ions for insensitive species. PAH adducts are formed under NICI conditions between the molecular PAH species in the gas phase and radical species present in the methane plasma. The alkyl-PAH adduct species is subsequently ionized by resonance capture of a low energy thermal electron. NICI spectra acquired using methane and deuteromethane as the reagent gases were used to elucidate two reaction schemes leading to the formation of the observed adduct ions. The absolute sensitivities for individual PAH varied over more than three orders of magnitude under methane NICI conditions, and the sensitivity and selectivity of detection for isomeric PAH were found to depend on the pressure and temperature in the ion source of the mass spectrometer. The selectivity of detection observed for parent PAH species was also observed for their alkylated homologues. The selectivity of NICI for isomeric PAH was used for the qualitative and quantitative determination of trace levels of PAH and alkylated-PAH in samples of a petroleum crude oil, diesel particulate matter, and urban air particulate matter.Source: Dissertation Abstracts International, Volume: 47-11, Section: B, page: 4488.Ph.D. American University 1986.Englis
E-cigarette aerosol collection using converging and straight tubing sections: physical mechanisms
No full textHypothesis
Identification and quantification of harmful chemicals in e-cigarette aerosol requires collecting the aerosolized e-liquid for chemical analysis. In 2016, Olmedo at al. empirically developed a simple method for aerosol collection by directing the aerosol through a sequence of alternating straight and converging tubing sections, which drain the recovered e-liquid into a collection vial. The tubing system geometry and flow conditions promote inertial impaction of aerosolized e-liquid on tube walls, where it deposits and flows into the collection vial.
Experiments
We use high-speed optical imaging to visualize aerosol transport in proxies of the collection system. We also determined collection efficiencies of various configurations of the collection system.
Findings
A turbulent jet emerges from converging conical sections and impinges onto the wall of downstream tubing sections, resulting in inertial impaction and deposition of the aerosol. For inertial impaction to occur the tip radius of the converging section must be small enough for a jet to be formed and the sequence of tubing sections must be curved in a polygon-like manner such that the jet emerging from a converging section impinges on the downstream tube wall. The collection efficiency is significantly smaller without such curvature.Peer reviewe
Corrigendum: The Associations of Dyadic Coping and Relationship Satisfaction Vary between and within Nations: A 35-Nation Study
No full textA corrigendum on:
The Associations of Dyadic Coping and Relationship Satisfaction Vary between and within Nations: A 35-Nation Study
by Hilpert, P., Randall, A. K., Sorokowski, P., Atkins, D. C., Sorokowska, A., Ahmadi, K., et al. (2016). Front. Psychol. 7:1106. doi: 10.3389/fpsyg.2016.01106
Due to an oversight, the name of the author “Ahmad M. Alghraibeh” was incorrectly spelled as “Ahmad M. Aghraibeh.” The correct version is shown above. The authors apologize for this oversight. This error does not affect the scientific conclusions of the article in any way.
The original article has been updated.[This corrects the article on p. 1106 in vol. 7, PMID: 27551269.]
Designing Emotionally Expressive Behaviors for an Appearance-Constrained Robot: Evaluating the Affective Interpretation of Motion, Light and Sound
No full textHow can robots without expressive faces or bodies convey emotions? Why would it be useful if robots could express emotion? In the context of human-robot interaction, could emotional expression lead to a greater comprehension of robotic behaviors and intents? These are questions addressed by the field of affective robotics, which seeks to develop and establish naturalistic social interaction between robots and humans. Emotions can provide a natural communication modality to augment the multi-modal capabilities of social robots in a variety of domains.Historically, the emphasis in the field has been on facial and bodily expressions, relying heavily on anthropomorphic or zoomorphic robot appearances. This presents a challenge, as most robots are designed with functionality in mind, often lacking expressive faces and bodies, which limits their ability to effectively convey emotions. This study investigates the potential for appearance-constrained robots to convey emotions through variations in motion, light, and sound parameters.We conducted an experiment where participants rated the emotional qualities of a non-humanoid, faceless robot’s behaviors, which were manipulated through variations in motion, light, and sound parameters. Our approach is unique in that it adopts a bottom-up methodology similar to the work of Jack et al. on facial expressions. By systematically varying individual features and observing the resultant emotional perceptions, we aimed to discern the specific affective contributions of each parameter. Using machine-learning based regression models, we sought to predict the perceived emotional qualities based on these systematically varied parameters.Our findings reveal that variations in motion parameters, particularly speed, significantly influence the perceived intensity of arousal, joy, and dominance. Light temperature was found to affect the perceived intensity of anger and joy, while sound pitch influenced perceptions of surprise and fear. The regression models showed varying degrees of success, with the random forest models often outperforming linear models but also exhibiting a higher tendency to overfit the training data. The linear models, while less prone to overfitting, struggled to capture the full complexity of the emotional responses. These findings suggest that non-anthropomorphic robots can indeed convey emotional qualities through controlled variations in their behaviors, though the strength and clarity of these emotions remain limited. Future research should focus on enhancing the expressiveness of these parameters and testing the models with new data to better understand their generalizability and effectiveness
Teologické základy lidských práv
No full textThe paper focuses on the question of the importance of the theological justification of human rights. Firstly, it reflects in which way the philosophical and theological rationale of human rights is present in the current discourse on human rights and in the most important documents on human rights. Secondly, the author reflects on theological rationalisation of human rights as present in Church documents, starting with the encyclical Pacem in Terris, and the models of theological justification of human rights in contemporary German theology (Huber/Tödt, Saberschinsky, Sander) is presented. Thirdly, the basic theological-anthropological rationale of human rights is formulated. In the conclusion, the paper notices a tension among theological rationalisation on human rights and the reality of cultural and religion plurality
Modeling diachronic change in the third person singular: a multifactorial, verb- and author-specific exploratory approach
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