38 research outputs found
Humor and social cognition: Correlational and predictive relations in 3- to 47-month-olds
Get PDFWe thank parents and children for participating. We thank Eloise Prouten for helping with data collection. This project was funded by a PhD studentship from the Ministry of Education in Turkey, awarded to Burcu Soy Telli. Burcu Soy Telli was the primary author, and analyzed the data. Elena Hoicka edited and gave feedback on the manuscript, both in terms of content and analyses. We thank Dr. Claire Fox and Dr. Claudia von Bastian for valuable feedback on the manuscript. We would like to disclose that Elena Hoicka owns the website www.babylovesscience.com with which we collected most of the survey data. Data for this study are available by emailing the corresponding author.We examined the relations between humor and social cognition in early development. In Study 1, 84 3- to 47-month-olds completed social cognition and humor lab tasks. Parents completed the Early Social Cognition Inventory and the Early Humor Survey. Once age was controlled for, there was a positive relation between the parental surveys, but no relation between the lab tasks. Study 2 (N = 573) extended the surveys to a large diverse sample, finding this relation held for children under 1 year, and 1-, 2-, and 3-year-olds; and within gender, socio-economic status (parent education; household income), country (UK, USA), and ethnicity (Black, Asian, and minority ethnic ethnicity, White ethnicity). In Study 3, 214 parents from Study 2 repeated the surveys six months later. Humor predicted social cognition, but not the reverse. Social cognition and humor may be related in day-to-day life, but this relationship is difficult to capture in the laboratory.The Ministry of Education in Turke
Conception Et Contrôle D'un Quadrotor
Get PDFRESUME :
Au cours des dernières années, les véhicules aériens sans pilote (UAV) ont suscité un intérêt considérable et trouvé de nombreuses applications dans divers domaines, notamment la défense civile, la livraison commerciale, les loisirs et l'agriculture. La présente étude vise à fournir une exploration complète du développement systématique des quadricoptères, étayée par une enquête expérimentale approfondie. La recherche commence par une analyse détaillée des aspects méthodologiques impliqués dans le développement des quadricoptères. Elle éclaire notre approche en ingénierie, qui privilégie des principes de conception robustes et pose les bases d'une plateforme de recherche de quadricoptères open-source. Ensuite, cette thèse examine les techniques de dimensionnement des quadricoptères, mettant en évidence l'influence substantielle de la taille sur la sélection des composants optimaux. Une technique de regroupement basée sur les données est discutée de manière exhaustive et mise en œuvre dans le processus de sélection des composants du quadricoptère. De plus, ce travail aborde les aspects de la calibration et du filtrage des capteurs. Il englobe les procédures de calibration pour l'unité de mesure inertielle (IMU) et le capteur de boussole, ainsi que la mise en œuvre de techniques de filtrage des signaux des capteurs, en mettant particulièrement l'accent sur la technique de filtrage complémentaire. En outre, l'étude plonge dans l'analyse des vibrations, utilisant des techniques de transformée de Fourier rapide (FFT) pour parvenir à un équilibrage moteur-hélice et une réduction du bruit. L'identification de la dynamique du quadricoptère est examinée méticuleusement à travers des approches en boîte blanche, grise et noire, conduisant à une compréhension approfondie de la dynamique du système. Enfin, la thèse explore la conception de la commande en tirant parti du modèle identifié pour concevoir un contrôleur efficace. Dans l'ensemble, cette recherche offre des aperçus sur la conception et le contrôle des systèmes de quadricoptères, proposant une méthodologie complète dans le but de constituer une ressource précieuse pour les futurs efforts de recherche et développement dans ce domaine en évolution rapide.
ABSTRACT :
In recent years, Unmanned Aerial Vehicles (UAVs) have attracted considerable interest and found numerous applications in various fields, including civil defence, commercial delivery, recreation, and agriculture. The present study aims to provide a comprehensive exploration of systematic quadrotor development, substantiated by an extensive experimental investigation. The research commences by conducting a detailed analysis of the methodological aspects involved in quadrotor development. It elucidates our engineering approach, which prioritizes robust design principles and lays the foundation for an open-source quadrotor research platform. Subsequently, this thesis reviews quadrotor sizing techniques, highlighting the substantial influence of size on the selection of optimal components. A data-driven clustering technique is exhaustively discussed and implemented in the quadrotor components selection process. In addition, this work addresses aspects of sensor calibration and filtering. It encompasses the calibration procedures for the Inertial Measurement Unit (IMU) and Compass sensor, along with the implementation of sensor signals filtering techniques, with a specific emphasis on the complementary filter technique. Furthermore, the study delves into vibration analysis, utilizing Fast Fourier Transform (FFT) techniques to achieve motor-propeller balancing and noise reduction. Quadrotor dynamics identification is meticulously investigated through white, grey and black-box approaches, leading to a comprehensive understanding of the system dynamics. Finally, the thesis explores control design by leveraging the identified model to design an efficient controller. Overall, this research provides insights into the design and control of quadrotor systems, offering a comprehensive methodology with the aim to be a valuable resource for future research and development endeavours in this rapidly evolving field
Black-Box System Identification for Low-Cost Quadrotor Attitude at Hovering
No full textThe accuracy of dynamic modelling of unmanned aerial vehicles, specifically quadrotors, is gaining importance since strict conditionalities are imposed on rotorcraft control. The system identification plays a crucial role as an effective approach for the problem of the fine-tuning dynamic models for applications such control system design and as handling quality evaluation. This paper focuses on black-box identification, describing the quadrotor dynamics based on experimental setup through sensor preparation for data collection, modelling, control design, and verification stages.</p
Black-Box System Identification for Low-Cost Quadrotor Attitude at Hovering
Get PDFThe accuracy of dynamic modelling of unmanned aerial vehicles, specifically
quadrotors, is gaining importance since strict conditionalities are imposed on
rotorcraft control. The system identification plays a crucial role as an
effective approach for the problem of the fine-tuning dynamic models for
applications such control system design and as handling quality evaluation.
This paper focuses on black-box identification, describing the quadrotor
dynamics based on experimental setup through sensor preparation for data
collection, modelling, control design, and verification stages
Adaptive Sliding Mode Controller and Observer for Altitude and Attitude Control of a Quadrotor
No full textThis paper introduces an adaptive sliding mode control approach for stabilizing and tracking trajectories with a quadrotor. The closed-loop control system comprises three main components: the first addresses altitude and attitude stabilization as well as trajectory tracking. The second component is dedicated to parameter estimation, particularly mass estimation. The third part focuses on observing full states. The control method considers disturbances, sensor noise, and parameter uncertainties, with sliding mode control laws and observer adaptation designed based on the Lyapunov stability principle. Numerical simulations demonstrate the efficacy of the proposed control technique.</p
Nanoparticle formulations for new cytostatic agents against glioblastomas
No full textMany highly active antitumour agents are currently not employable for the systemic chemotherapy of brain tumours since their entrance into the brain is blocked by the BBB. Obviously, the development of a strategy allowing effective delivery of these agents across the BBB would enormously extend the potential of the systemic chemotherapy. Chemotherapy of rat glioblastoma using nanoparticle-bound doxorubicin Doxorubicin bound to polysorbate-coated nanoparticles had been previously shown to significantly enhance survival in the orthotopic rat 101/8 glioblastoma model. The objective of this study was to investigate the therapeutic effects of this formulation by morphometric, histological and immunohistological methods. The 101/8 glioblastoma was implanted intracranially into the male Wistar rats. The animals were randomly divided into 3 groups; one group served as untreated control (n = 20). The second group received doxorubicin in solution (Dox-sol, n = 18), and the third group received doxorubicin bound to PBCA nanoparticles coated with PS 80 (Dox-NP + PS 80, n = 18). The treatment regimen was 3 × 1.5 mg/kg on days 2, 5, and 8 after tumor implantation. The formulations were injected into the tail vein. The untreated control animals were sacrificed on days 6, 8, 10, 12, and 14 after the implantation. The animals that had received chemotherapy were sacrificed on day 10, 14 and 18 after the implantation. The brains were investigated by morphometrical, histochemical, and immunohistochemical methods such as the measurement of the tumor size, proliferation of tumor cells, vessel density, expression of glial fibrillary acidic protein (GFAP), expression of vascular endothelial growth factor (VEGF), incidence and dimension of necrosis, and microvascular proliferation. Tumours showed signs of malignancy including invasion to brain tissue and brisk mitotic activity. The tumor proliferation remained stable at high levels throughout the host survival time. Overall, the tumor showed a reproducible growth pattern and temporal development that is comparable to human glioblastoma. Furthermore, the 101/8 glioblastoma had infiltrated diffusely the surrounding host brain at the edge of the solid tumor mass showed no signs of encapsulation. Thus the 101/8 glioblastoma fulfills the most criteria for an adequate glioma model and can be qualified as a reliable model. ...Viele hochaktive Zytostatika sind zurzeit für die systematische chemotherapeutische Anwendung nicht einsetzbar, weil ihr Eintritt ins Gehirn durch die Blut-Hirn-Schranke (BHS) blockiert wird. Die Entwicklung einer Möglichkeit zum Transport dieser Stoffe über diese Schranke würde das Potenzial einer systemischen Chemotherapie bedeutend erhöhen. Chemotherapie von Glioblastomen mit Doxorobicin beladenen Nanopartikeln In früheren Studien wurde gezeigt, dass die Überlebenszeiten von Ratten mit ins Gehirn transplantierten 101/8 Glioblastomen durch mit Polysorbat 80 überzogenen Doxorubicin-Nanopartikel signifikant verlängert werden können. Ziel der vorliegenden Studie war es, die Effizienz dieser Doxorubicin-beladenen Nanopartikel mit morphometrischen, histologischen und immunohistologischen Methoden zu untersuchen, um so die Tiere weniger zu belasten als das in Letalitätsstudien erfolgt. Das 101/8 Glioblastom wurde dazu intrakranial männlichen Wistar-Ratten implantiert. Die Ratten wurden randomisiert in drei Gruppen geteilt: die erste Gruppe erhielt keine Behandlung (Kontrolle, n = 20), die zweite Gruppe wurde mit Doxorubicin-Lösung (Dox-sol, n = 18) und die dritte Gruppe mit Polysorbat 80-überzogenen Doxorubicin-Nanopartikeln (Dox-NP + PS 80, n = 18) behandelt. ..
Successful marketing strategies using mobile marketing techniques
No full textIGI Global has released an article entitled, Mobilized Marketing and the Consumer: Technological Developments and Challenges, which explores technological developments and significant issues concerning the explosion of mobile devices in the information age. This innovative publication investigates best practices for human interaction with information technologies, providing the latest research on topics such as Bluetooth, mobile phones, and online portals. Gonca Yamamoto, the author of the article, discusses the impacts of technology on marketing, presenting the current situation where certain traditional rules of marketing are not valid anymore. He introduces new ideas in marketing strategies focusing in detail on the way the convergence of computers with mobile devices can influence the target mass in an efficient and measurable manner
Direct or Dna Extraction-Free Amplification and Quantification of Foodborne Pathogens
No full textThe use of direct nucleic acid amplification of pathogens from food matrices has the potential to reduce time to results over DNA extraction-based approaches as well as traditional culture-based approaches. Here we describe protocols for assay design and experiments for direct amplification of foodborne pathogens in food sample matrices using loop-mediated isothermal amplification (LAMP) and polymerase chain reaction (PCR). The examples provided include the detection of Escherichia coli in milk samples and Salmonella in pork meat samples. This protocol includes relevant reagents and methods including obtaining target sequences, assay design, sample processing, and amplification. These methods, though used for specific example matrices, could be applied to many other foodborne pathogens and sample types. © 2025. The Author(s), under exclusive license to Springer Science+Business Media, LLC, part of Springer Nature
The effects of metal type, number of layers, and hybrid yarn placement on the absorption and reflection properties in electromagnetic shielding of woven fabrics
No full textIn this study, stainless steel, copper, and silver wires were intermingled with two polyamide 6.6 filaments through the commingling technique to produce three-component hybrid yarns. The produced hybrid yarns were used as weft in the structure of plain woven fabric samples. The electromagnetic shielding effectiveness parameters of samples were measured in the frequency range of 0.8–5.2 GHz by the free space technique. The effects of metal hybrid yarn placement, number of fabric layers, metal types, and wave polarization on the electromagnetic shielding effectiveness and absorption and reflection properties of the woven fabrics were analyzed statistically at low and high frequencies separately. As a result, the samples have no shielding property in the warp direction. Metal types show no statistically significant effect on electromagnetic shielding effectiveness. However, fabrics containing stainless steel have a higher absorption power ratio than copper and silver samples. Double-layer samples have higher electromagnetic shielding effectiveness values than single-layer fabrics in both frequency ranges. However, the number of layers does not have a significant effect on the absorbed and reflected power in the range of 0.8–2.6 GHz. There was a significant difference above 2.6 GHz frequency for absorbed power ratio. An increase in the density of hybrid yarns in the fabric structure leads to an increase in the electromagnetic shielding effectiveness values. Two-metal placement has a higher absorbed power than the full and one-metal placements, respectively. The samples which have double layers and including metal wire were in their all wefts reached the maximum electromagnetic shielding effectiveness values for stainless steel (78.70 dB), copper (72.69 dB), and silver composite (57.50 dB) fabrics. © The Author(s) 2019
How should grid operators govern smart grid innovation projects? An embedded case study approach
No full textAbstractGrid operators increasingly have to collaborate with other actors in order to realize smart grid innovations. For routine maintenance, grid operators typically acquire technologies in one-off transactions, but the innovative nature of smart grid projects may require more collaborate relationships. This paper studies how a transactional versus relational approach to governing smart grid innovation projects affects incentives for other actors to collaborate. We analyse 34 cases of smart grid innovation projects based on extensive archival data as well as interviews. We find that projects relying on relational governance are more likely to provide incentives for collaboration. Especially non-financial incentives such as reputational benefits and shared intellectual property rights are more likely to be found in projects relying on relational governance. Policy makers that wish to stimulate smart grid innovation projects should consider stimulating long-term relationships between grid operators and third parties, because such relationships are more likely to produce incentives for collaboration
