7,155 research outputs found

    Examples of works to practice staccato technique in clarinet instrument

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    Klarnetin staccato tekniğini güçlendirme aşamaları eser çalışmalarıyla uygulanmıştır. Staccato geçişlerini hızlandıracak ritim ve nüans çalışmalarına yer verilmiştir. Çalışmanın en önemli amacı sadece staccato çalışması değil parmak-dilin eş zamanlı uyumunun hassasiyeti üzerinde de durulmasıdır. Staccato çalışmalarını daha verimli hale getirmek için eser çalışmasının içinde etüt çalışmasına da yer verilmiştir. Çalışmaların üzerinde titizlikle durulması staccato çalışmasının ilham verici etkisi ile müzikal kimliğe yeni bir boyut kazandırmıştır. Sekiz özgün eser çalışmasının her aşaması anlatılmıştır. Her aşamanın bir sonraki performans ve tekniği güçlendirmesi esas alınmıştır. Bu çalışmada staccato tekniğinin hangi alanlarda kullanıldığı, nasıl sonuçlar elde edildiği bilgisine yer verilmiştir. Notaların parmak ve dil uyumu ile nasıl şekilleneceği ve nasıl bir çalışma disiplini içinde gerçekleşeceği planlanmıştır. Kamış-nota-diyafram-parmak-dil-nüans ve disiplin kavramlarının staccato tekniğinde ayrılmaz bir bütün olduğu saptanmıştır. Araştırmada literatür taraması yapılarak staccato ile ilgili çalışmalar taranmıştır. Tarama sonucunda klarnet tekniğin de kullanılan staccato eser çalışmasının az olduğu tespit edilmiştir. Metot taramasında da etüt çalışmasının daha çok olduğu saptanmıştır. Böylelikle klarnetin staccato tekniğini hızlandırma ve güçlendirme çalışmaları sunulmuştur. Staccato etüt çalışmaları yapılırken, araya eser çalışmasının girmesi beyni rahatlattığı ve istekliliği daha arttırdığı gözlemlenmiştir. Staccato çalışmasını yaparken doğru bir kamış seçimi üzerinde de durulmuştur. Staccato tekniğini doğru çalışmak için doğru bir kamışın dil hızını arttırdığı saptanmıştır. Doğru bir kamış seçimi kamıştan rahat ses çıkmasına bağlıdır. Kamış, dil atma gücünü vermiyorsa daha doğru bir kamış seçiminin yapılması gerekliliği vurgulanmıştır. Staccato çalışmalarında baştan sona bir eseri yorumlamak zor olabilir. Bu açıdan çalışma, verilen müzikal nüanslara uymanın, dil atış performansını rahatlattığını ortaya koymuştur. Gelecek nesillere edinilen bilgi ve birikimlerin aktarılması ve geliştirici olması teşvik edilmiştir. Çıkacak eserlerin nasıl çözüleceği, staccato tekniğinin nasıl üstesinden gelinebileceği anlatılmıştır. Staccato tekniğinin daha kısa sürede çözüme kavuşturulması amaç edinilmiştir. Parmakların yerlerini öğrettiğimiz kadar belleğimize de çalışmaların kaydedilmesi önemlidir. Gösterilen azmin ve sabrın sonucu olarak ortaya çıkan yapıt başarıyı daha da yukarı seviyelere çıkaracaktır

    Numerical investigation of ducted propellers for novel rotorcraft configurations

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    The ducted propeller is a promising propulsion or lift generator for novel rotorcraft configurations, considering the stringent restrictions on safety, efficiency, and noise/carbon emissions. However, extensive research work is still needed to further understand the aerodynamic and acoustic characteristics of ducted propellers at various conditions. This thesis aims to deliver highfidelity and systematic investigations of the aerodynamics, acoustics, and optimisation of ducted/open propellers at various conditions. A detail survey of past works on ducted propellers was first performed to analyse the research status and challenges. Critical assessments of available data sets for validation were also carried out. Numerical validation was then performed to verify the meshing, numerical methods, and simulation strategies for ducted propellers using a test case by NASA. High-fidelity CFD methods and lower-order tools were employed and compared at a range of conditions. Detailed analyses of the aerodynamic performance of ducted/open propellers were later performed at various advance ratios, pitch angles, and crosswind angles. The near- and far-field acoustic features of the ducted/open propellers in axial flight was also computed and inspected closely. A gradient-based design optimisation framework was also compiled to improve the ducted propeller performance at high advance ratios by varying the duct and blade shapes. The gradients of aerodynamic performance with respect to the design variables were computed using the discrete adjoint CFD methods. The ducted propeller thrust was successfully increased at high advance ratios after the optimisation. The far-field acoustics of the optimised designs was only mildly affected by the optimisation. A parametric study of the equivalent ducted/open propellers was also conducted to further evaluate the influence of different design and operating conditions. An automatic mesh generation tool chain was developed to ease the efforts required for the mesh generation. The ducted/open propellers were then installed under a main rotor to investigate performance changes due to the aerodynamic interactions. The main rotor downwash induced imbalanced disk loadings and loading variations with complex frequency compositions. The duct was found to provide aerodynamic shielding for the blades enclosed, but it also created considerable blockage to the downwash flow. A simplified modelling approach for the rotor/propeller interactions using actuator disk models was later put forward. By introducing an inflow distortion metric quantifying the aerodynamic interactions, an optimisation framework was compiled to minimise the rotor/propeller interference by changing the propeller position, i.e. the configuration optimisation. The inflow distortion factor was used as the objective, and its gradients with respect to the propeller position were computed using the adjoint method. Gradient-based and gradient-free optimisation approaches were proposed and assessed. With constraints on the pitching and rolling moments, the optimisation managed to effectively reduce the rotor/propeller interference. The optimisation results were further verified using blade-resolved simulations

    Growth trends and site productivity in boreal forests under management and environmental change: insights from long-term surveys and experiments in Sweden

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    Under a changing climate, current tree and stand growth information is indispensable to the carbon sink strength of boreal forests. Important questions regarding tree growth are to what extent have management and environmental change influenced it, and how it might respond in the future. In this thesis, results from five studies (Papers I-V) covering growth trends, site productivity, heterogeneity in managed forests and potentials for carbon storage in forests and harvested wood products via differing management strategies are presented. The studies were based on observations from national forest inventories and long-term experiments in Sweden. The annual height growth of Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) had increased, especially after the millennium shift, while the basal area growth remains stable during the last 40 years (Papers I-II). A positive response on height growth with increasing temperature was observed. The results generally imply a changing growing condition and stand composition. In Paper III, yield capacity of conifers was analysed and compared with existing functions. The results showed that there is a bias in site productivity estimates and the new functions give better prediction of the yield capacity in Sweden. In Paper IV, the variability in stand composition was modelled as indices of heterogeneity to calibrate the relationship between basal area and leaf area index in managed stands of Norway spruce and Scots pine. The results obtained show that the stand structural heterogeneity effects here are of such a magnitude that they cannot be neglected in the implementation of hybrid growth models, especially those based on light interception and light-use efficiency. In the long-term, the net climate benefits in Swedish forests may be maximized through active forest management with high harvest levels and efficient product utilization, compared to increasing carbon storage in standing forests through land set-asides for nature conservation (Paper V). In conclusion, this thesis offers support for the development of evidence-based policy recommendations for site-adapted and sustainable management of Swedish forests in a changing climate

    Managing global virtual teams in the London FinTech industry

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    Today, the number of organisations that are adopting virtual working arrangements has exploded, and the London FinTech industry is no exception. During recent years, FinTech companies have increasingly developed virtual teams as a means of connecting and engaging geographically dispersed workers, lowering costs, and enabling greater speed and adaptability. As the first study in the United Kingdom regarding global virtual team management in the FinTech industry, this DBA research seeks answers to the question, “What makes for the successful management of a global virtual team in the London FinTech industry?”. Straussian grounded-theory method was chosen as this qualitative approach lets participants have their own voice and offers some flexibility. It also allows the researcher to have preconceived ideas about the research undertaking. The research work makes the case for appreciating the voice of people with lived experiences. Ten London-based FinTech Managers with considerable experience running virtual teams agreed to take part in this study. These Managers had spent time working at large, household-name firms with significant global reach, and one had recently become founder and CEO of his own firm, taking on clients and hiring contract staff from around the world. At least eight of the other participants were senior ‘Heads’ of various technology teams and one was a Managing Director working at a ‘Big Four’ consultancy. They had all (and many still did) spent years running geographically distributed teams with members as far away as Pacific Asia and they were all keen to discuss that breadth of experience and the challenges they faced. Results from these in-depth interviews suggested that there are myriad reasons for a global virtual team, from providing 24 hour, follow-the-sun service to locating the most cost-effective resources with the highest skills. It also confirmed that there are unique challenges to virtual management and new techniques are required to help navigate virtual managers through them. Managing a global virtual team requires much more than the traditional management competencies. Based on discussion with the respondents, a set of practical recommendations for global virtual team management was developed and covered a wide range of issues related to recruitment and selection, team building, developing standard operating procedures, communication, motivation, performance management, and building trust

    Evaluación estructural probabilística de una cubierta de hormigón suspendida con cables: el Estadio de Braga (Portugal)

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    Cable structures often pose a signi cant challenge, particularly due to the struggle in foreseeing the structural response during the design. Because of this we rely on nite element models, despite their complexity, especially when facing dynamic forces. Hence the need of simpli ed models, optimized to retrace speci c behaviours of the structure and reduce the computational burden. This Master’s degree thesis deals with the case of the Braga Stadium, characterised by a roof of concrete shells supported by suspended cables. The aim is to assess whether reliable results regarding its seismic response can be obtained from simpli ed models. Starting from the provided designs and information, we calculate the cables geometry and performed a static analysis of the cables and the East stand, whose results re exploited to calibrate the simpli ed models. The structural layout on parallel elements allows us to simplify the structure as a planar one: we have assembled three models with increasing amount of simpli cation, that include the cables and the East stand upright. The West stand is not included as on its side the cables are anchored directly to the rock. The models are evaluated through a multi-support analysis, considering the two uttermost cases: with perfectly correlated accelerograms and with uncorrelated accelerograms. We perform several simulations, extrapolating from each one the peak values of the maximum cable force and the maximum relative displacement of its ends. We then processed these data, calculating the main statistical parameters and the empirical distribution functions for each model. [EN] The comparison shows that using simpli ed models we can obtain reliable results for the maximum cable forces, but not for the maximum relative displacements. Furthermore, cable modelling cannot be ignored: any simpli cation must be applied solely to the support structures. Finally, the use of uncorrelated accelerograms causes a signi cant increase of cable forces, even if a realistic scenario would be intermediate to the two considered. This result enhances the need of a multi-support analysis in this kind of structures, especially in case of large span suspended roofs like the one studied here.Gerussi, R. (2022). Evaluación estructural probabilística de una cubierta de hormigón suspendida con cables: el Estadio de Braga (Portugal). Universitat Politècnica de València. http://hdl.handle.net/10251/181531TFG

    Photoluminescence quantum efficiency investigations on thin film light-emitting diodes during electrical operation

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    Abstract: A photoluminescence measurement setup was constructed to investigate on the optical emitter properties of thin film light-emitting diodes during electrical operation. Firstly, investigations - with this setup - on organic LEDs containing either phosphorescent Ir-based molecules or TADF based emitters were compared. Furthermore, the influence of polar materials used in adjacent charge transport layers was studied. The introduction of a sizeable Giant Surface Potential lead to a significant amount of Photoluminescence Quantum Efficiency reduction already prior to the electroluminescent turn-on of the LED. Secondly, the performance of Quantum-Dot-LEDs (QDLEDs) based on InP/ZnSe/ZnS Core-Shell-Shell structures was investigated under electrical bias. While a considerable amount of field induced efficiency losses was observed in the reverse bias regime, a developed theoretical model clearly identified Auger quenching as the dominant loss process under forward operation. Observed metastabilities in these QD-based systems show the need for further research in this field, as a model to explain these effects could be proposed to be linked to ion migration in the QD- and adjacent charge transport layers, however definitive proof is still missing

    Studies of strategic performance management for classical organizations theory & practice

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    Nowadays, the activities of "Performance Management" have spread very broadly in actually every part of business and management. There are numerous practitioners and researchers from very different disciplines, who are involved in exploring the different contents of performance management. In this thesis, some relevant historic developments in performance management are first reviewed. This includes various theories and frameworks of performance management. Then several management science techniques are developed for assessing performance management, including new methods in Data Envelopment Analysis (DEA) and Soft System Methodology (SSM). A theoretical framework for performance management and its practical procedures (five phases) are developed for "classic" organizations using soft system thinking, and the relationship with the existing theories are explored. Eventually these results are applied in three case studies to verify our theoretical development. One of the main contributions of this work is to point out, and to systematically explore the basic idea that the effective forms and structures of performance management for an organization are likely to depend greatly on the organizational configuration, in order to coordinate well with other management activities in the organization, which has seemingly been neglected in the existing literature of performance management research in the sense that there exists little known research that associated particular forms of performance management with the explicit assumptions of organizational configuration. By applying SSM, this thesis logically derives some main functional blocks of performance management in 'classic' organizations and clarifies the relationships between performance management and other management activities. Furthermore, it develops some new tools and procedures, which can hierarchically decompose organizational strategies and produce a practical model of specific implementation steps for "classic" organizations. Our approach integrates popular types of performance management models. Last but not least, this thesis presents findings from three major cases, which are quite different organizations in terms of management styles, ownership, and operating environment, to illustrate the fliexbility of the developed theoretical framework

    The Effect of Interprofessional Conflict Resolution on Interprofessional Collaborative Practice among Health Care Provider Teams in Hospitals

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    Client needs and their complexities have increased, challenging multiple professionals to work together within health systems to reach better patient outcomes. Addressing this challenge requires interprofessional collaboration, which, while essential, may also breed conflict given that individuals from various health care disciplines each bring their unique perspectives into teamwork. While some degree of disagreement is expected, team members must be able to resolve conflicts to ensure effective patient care. However, limited information was available that described and clearly defined interprofessional conflict resolution as a concept. The aim of this study was threefold. This study began with a concept analysis of interprofessional conflict resolution (IPCR) as a means to identify its attributes to generate instrument items. This study then carried out development and testing of the psychometric properties of an instrument designed to measure IPCR among health care teams, followed by development and evaluation of the effect of an interventional education program to resolve interprofessional conflicts in teams. Finally, the testing of a theoretically derived model linking the relationship between health care providers’ personal factors (general self-efficacy and team psychological safety) and interpersonal communication competence on interprofessional collaborative practice, and explored if these relationships were moderated by interprofessional conflict resolution. The Interprofessional Conflict Resolution Scale was found to be valid and reliable. The findings indicated that participants’ perceived learning effectiveness based on their learning outcome ratings represented 93.3% learning effectiveness from the training program. This study identified five emerging themes from participants’ reflections and open- ended answers from the feedback form supporting the transfer of learning into the practice. The theoretically derived model tested in this research study was supported by the data collected, with the exception of one hypothesis (H4)

    One rule to rule them all

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