9,889 research outputs found
Rowe, Berlin, etc.
No full textEl artículo tiene como objetivo resaltar algunas de las cuestiones planteadas en los textos de Colin Rowe, en particular las ideas que conforman "Collage City".Peer Reviewe
Rowe, Berlin, etc.
No full textEl artículo tiene como objetivo resaltar algunas de las cuestiones planteadas en los textos de Colin Rowe, en particular las ideas que conforman "Collage City".Peer Reviewe
Psychometric properties of the new patients’ expectations questionnaire
No full textThe authors explore the development of the Patients’ Expectations Questionnaire (PEQ) and examination of psychometric characteristics it encompasses by reviewing surveys of primary care and hospital outpatients before and after their clinic visit. Three scales were developed for Pre-visit Ideal and Realistic expectations, and Post-visit Experiences (met expectations), based on literature review, semi-structured interviews, and subsequently piloted and refined. Patients completed the questionnaire about their ideal and realistic expectations before they saw the doctor, and were asked if their expectations had been met afterwards. The results show the scales met acceptability criteria for reliability (Cronbach’s alphas exceeded ? 0.70), administration mode (interview and self-completion), and sample type (general practice and hospital). Split-half reliability was also acceptable. Adjusted odds ratios showed that post-visit experiences (met expectations), followed by feelings of control in life, and age, were the most powerful independent predictors of overall patient satisfaction ratings with the clinic visit, and independent self-ratings of whether their expectations had been met overall. This leads the authors to conclude that the PEQ as a self-report instrument, has good reliability and validity and covers the main types of patient expectations of ambulatory health care. It has policy potential for monitoring expectation management, and is thus of potential benefit to providers and purchasers of health services, and ultimately to patients
‘Dada Angelika’ and Marta ‘La Paloma’ Hegemann
No full textAngelika Hoerle: the Comet of the Cologne Avant-Garde 1912-23 Edited by Michael Parke-Taylor, acting curator of European Art, AGO The Art Gallery of Ontario hosted the exhibition Angelika Hoerle: the Comet of the Cologne Avant-Garde 1912-23 at the AGO from May 23 to August 30, 2009. Hoerle (1899-1923) and her artist husband Heinrich Hoerle were key figures in the Dada movement in Cologne, and she created an outstanding body of work - now almost entirely housed at the AGO - from 1919 until her untimely death in 1923. The exhibition and catalogue will explore how her art fit into the artistic and political movements in Weimar, Germany. Includes essays by Angie Littlefield, Dr. Sabine Kriebel and Dr. Dorothy Rowe. Co-published with Verlag der Bucchandlung Walther König, Cologne Available in English and GermanAngelika Hoerle: the Comet of the Cologne Avant-Garde 1912-23 Edited by Michael Parke-Taylor, acting curator of European Art, AGO The Art Gallery of Ontario hosted the exhibition Angelika Hoerle: the Comet of the Cologne Avant-Garde 1912-23 at the AGO from May 23 to August 30, 2009. Hoerle (1899-1923) and her artist husband Heinrich Hoerle were key figures in the Dada movement in Cologne, and she created an outstanding body of work - now almost entirely housed at the AGO - from 1919 until her untimely death in 1923. The exhibition and catalogue will explore how her art fit into the artistic and political movements in Weimar, Germany. Includes essays by Angie Littlefield, Dr. Sabine Kriebel and Dr. Dorothy Rowe. Co-published with Verlag der Bucchandlung Walther König, Cologne Available in English and Germa
Common Mode Currents in DC Power Routers
No full textThe grid reinforcement and energy redirection needs have led to the emergence of Back-To-Back Voltage Source Converter (BTB-VSC) based dc power routers. This paper investigates the low frequency Common Mode Currents (CMCs) that arise in the system if the employed BTB-VSCs have an un-isolated ac path connected in parallel to their output ports. Simulation results are presented to show a sensitivity analysis of lower order harmonics in CMC with respect to the operating active and reactive power of the dc router, dc link voltage, link resistance, modulation method and pole capacitance. Experimental results are shared to show existance of lower order CMC in 3-wire ac link operating in parallel with the dc power router and these are mitigated using zero sequence controller
Modeling, Control, and Operation of an M-DAB DC-DC Converter for Interconnection of HVDC Grids
No full textFuture high-voltage direct-current (HVDC) networks based on voltage source converters (VSCs) will have different structures (asymmetric monopolar, bipolar, or symmetric monopolar), voltage levels, control, and protection schemes. Therefore, dc-dc converters are needed to interconnect those VSC-HVDC grids and several technical issues on their control and operational systems must be adequately addressed. A dc-dc converter based on a modular-dual active bridge (M-DAB) converter is suggested to reach a desirable interconnection of the HVDC grids and regulate power flow (PF) between them. A dynamic averaged model is proposed for the M-DAB converter and its stability is analyzed using the Lyapunov function. Moreover, a new local controller based on nonlinear control theory is proposed for the M-DAB. The new M-DAB local controller is integrated with the energy management system (EMS), by updating the PF equations, to create a complete control structure. Considering the CIGRE DCS3 HVDC test system and the studied M-DAB, static, dynamic simulation, and experimental studies are conducted and the dc-dc converter and the performance of the designed controllers and the EMS are examined and validated.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Intelligent Electrical Power Grid
Restructuring the existing medium voltage distribution grids using DC systems
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.DC systems, Energy conversion & Storag
Cold cracking in DC-cast high strength aluminum alloy ingots: An intrinsic problem intensified by casting process parameters
No full textFor almost half a century the catastrophic failure of direct chill (DC) cast high strength aluminum alloys has been challenging the production of sound ingots. To overcome this problem, a criterion is required that can assist the researchers in predicting the critical conditions which facilitate the catastrophic failure of the ingots. This could be achieved at first glance by application of computer simulations to assess the level and distribution of residual thermal stresses. However, the simulation results are only able to show the critical locations and conditions where and when high stresses may appear in the ingots. The prediction of critical void/crack size requires simultaneous application of fracture mechanics. In this paper, we present the thermo-mechanical simulation results that indicate the critical crack size distribution in several DC-cast billets cast at various casting conditions. The simulation results were validated upon experimental DC-casting trials and revealed that the existence of voids/cracks with a considerable size is required for cold cracking to occur.Materials Science & EngineeringMechanical, Maritime and Materials Engineerin
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