Rotorcraft Blade Angle Calibration Methods

The most vital system of a rotorcraft is the rotor system due to its effects on the overall flight quality of the vehicle. Therefore, it is of importance to be able to accurately determine blade position during flight so that fine adjustments can be made to ensure a safe and efficient flight. In this study, a current calibration method focusing on the pitch, flap, and lead-lag blade angles is analyzed and found to have larger than acceptable error associated with the sensor calibrations. A literature review is conducted which reveals four novel methods that can potentially increase the accuracy of the sensor calibrations. An uncertainty analysis is conducted aiding in the decision of which of the four methods would best improve the calibration accuracy. The results conclude that a simpler method can be applied and calibration times can greatly be reduced while increasing the accuracy of the calibration. Finally, a new calibration method is proposed utilizing the newly chosen sensor that can be later implemented into the system

Transformational leadership style, motivation and academics' job performance at public universities, South-West Nigeria

Currently, in Nigeria, the concern on the job performance of the public university academics is increasing resulted from severe academics’ job retrenchment crisis due to the wavering and discouraging current economic condition. The problem certainly threatens their job guarantee that impede them to effectively perform their work. Besides, ineffective leadership with low motivation factors causing reluctance to perform their work. Nevertheless, previous studies revealed transformational leadership and appropriate motivation increase good job performance. Therefore, convincing motivation element and transformational leadership are two essential boosters to increase academics’ job performance. Hence, this study aimed to investigate the relationship between transformational leadership, motivation and academics’ job performance as well as gauging motivation variable as an important mediator on the relationship between transformational leadership and academics’ job performance. A quantitative method was used via a survey. Data was collected from 515 academics through simple random sampling technique from six public universities in six geopolitical zones at southwest Nigeria. Data were analyzed using SPSS and PLS-SEM statistical software. Four hypotheses were tested examining the extent of correlation, prediction and mediation influence in the research framework. Findings revealed a significant positive relationship between transformational leadership, motivation and academics job performance, whilst transformational leadership is substantiated as a significant predictor of academic’s job performance. In fact, motivation is confirmed as a significant mediator on the relationship between transformational leadership and academics’ job performance. Overall, results have supported previous findings on the relationship between these variables and the importance of motivation in assisting transformational leadership to enhance academics’ job performance. Theoretical implications, methodologies and practicalities are discussed and in line with the global industries requirements and implement program development leadership for university academics. Therefore, the university sector should ensure effective transformational leadership in order to improve academics' motivation that will enhance their job performance

Learning systemic management practice

Systems thinking has been proposed as an answer to the question of how management practitioners can best equip themselves to tackle the complexity of management practice. As a body of work intended to transcend disciplinary silos, systems thinking pursues the ideal of generating comprehensive descriptions of real situations. It seeks to do this by embracing a variety of systems approaches and ideas to explain patterns and hypothesise causes of observable empirical events. As systems thinking is a diverse field, there are many knowledge areas and perspectives available to programme designers to facilitate teaching and the learning of systems thinking for management practice. The purpose of this study is to examine students' experience of learning events in the context of an interdisciplinary course designed for the development of management practice through systems thinking. Data was collected from three cohorts of students by observing lectures and class-based group work; and conducting interviews using conversational repertory grid techniques. The interview responses were analysed using grounded theory principles. Based on the findings derived from this qualitative analysis, the process of learning of systems thinking is outlined as a practice involving the selection and interpretation of events which evolve from the starting out phase, where students become interested in learning, and then outlines progress through the phases of assimilation and, changes in knowledge, culminating in more complex learning phases described as integration and adaptation. The synthesis of these phenomena as a theory provided an answer to the primary research objective of investigating how students experience learning events designed to develop systemic management practice. Critical realism, following Bhaskar's philosophy, is used to frame explanations to extend the grounded theory analysis, seeking to account for generative mechanisms that enable and constrain student experience with respect to systems thinking development. As a secondary contribution, this informed the identification of possible mechanisms and emergent properties at the level of the course through an analytical separation of the academic and work environments. These included the discourse of the context of application, academic discourse and professional identity. In combination, these findings make a contribution to understanding the learning of systemic management practice. In addition, applications for this research are suggested for educators, managers and organisations. These applications include: 1) a framework to help educators design meaningful experiences for learners; 2) a basis for understanding what constitutes systemic management practice and explaining differential development; 3) establishment of a basis for understanding what is needed for organisations to support the development of systemic management practice

Interplay of excitation transport and atomic motion in flexible Rydberg aggregates

Strong resonant dipole-dipole interactions in flexible Rydberg aggregates enable the formation of excitons, many-body states which collectively share excitation between atoms. Exciting the most energetic exciton of a linear Rydberg chain whose outer two atoms on one end are closely spaced causes the initiation of an exciton pulse for which electronic excitation and diatomic proximity propagate directed through the chain. The emerging transport of excitation is largely adiabatic and is enabled by the interplay between atomic motion and dynamical variation of the exciton. Here, we demonstrate the coherent splitting of such pulses into two modes, which induce strongly different atomic motion, leading to clear signatures of nonadiabatic effects in atomic density profiles. The mechanism exploits local nonadiabatic effects at a conical intersection, turning them from a decoherence source into an asset. The conical intersection is a consequence of the exciton pulses moving along a linear Rydberg chain and approaching an additional linear, perpendicularly aligned Rydberg chain. The intersection provides a sensitive knob controlling the propagation direction and coherence properties of exciton pulses. We demonstrate that this scenario can be exploited as an exciton switch, controlling direction and coherence properties of the joint pulse on the second of the chains. Initially, we demonstrate the pulse splitting on planar aggregates with atomic motion one-dimensionally constrained and employing isotropic interactions. Subsequently, we confirm the splitting mechanism for a fully realistic scenario in which all spatial restrictions are removed and the full anisotropy of the dipole-dipole interactions is taken into account. Our results enable the experimental observation of non-adiabatic electronic dynamics and entanglement transport with Rydberg atoms. The conical intersection crossings are clearly evident, both in atomic mean position information and excited state spectra of the Rydberg system. This suggests flexible Rydberg aggregates as a test-bench for quantum chemical effects in experiments on much inflated length scales. The fundamental ideas discussed here have general implications for excitons on a dynamic network

European Space Agency

Proceedings published a