Towards a Simplified Dynamic Wake Model using POD Analysis

We apply the proper orthogonal decomposition (POD) to large eddy simulation data of a wind turbine wake in a turbulent atmospheric boundary layer. The turbine is modeled as an actuator disk. Our analyis mainly focuses on the question whether POD could be a useful tool to develop a simplified dynamic wake model. The extracted POD modes are used to obtain approximate descriptions of the velocity field. To assess the quality of these POD reconstructions, we define simple measures which are believed to be relevant for a sequential turbine in the wake such as the energy flux through a disk in the wake. It is shown that only a few modes are necessary to capture basic dynamical aspects of these measures even though only a small part of the turbulent kinetic energy is restored. Furthermore, we show that the importance of the individual modes depends on the measure chosen. Therefore, the optimal choice of modes for a possible model could in principle depend on the application of interest. We additionally present a possible interpretation of the POD modes relating them to specific properties of the wake. For example the first mode is related to the horizontal large scale movement. Besides yielding a deeper understanding, this also enables us to view our results in comparison to existing dynamic wake models

Irrigation in small holder coconut cultivation in Kerala , India - a financial analysis

Financial analysis of irrigation investments in existing as well as new plantations of coconut was conducted. The annualized capital costs and variable costs were included in the cost of irrigation. The levelised annual cost approach was used to compute the pumping cost. The study was conducted in a mixed cropping system. The effective area under each crop was computed and the allocation of irrgation costs was done accordingly. In all the land types the investments in irrigation was found to be highly feasible financially. The financial ratios were found to be higher in midland categories indicating that compated to the other regions, the midland region had higher potential for investment in irrigation

Fruit and vegetable exports in the post-liberalization era: The Indian experience

The liberalization of agricultural trade brought about by the economic reforms of 1991, the subsequent WTO agreement and the proliferating Regional Trading Agreements have opened opportunities as well as challenges for India’s horticultural trade. This paper analyses the performance of horticultural exports from the country in terms of growth, instability, dynamics, diversification and stability with respect to commodities and markets and the constraints in terms of the Non-Tariff Measures (NTMs) faced and delineates the opportunities and strategies required to be followed by the sector for a sustainable growth. The horticultural exports from the country have grown significantly in both quantity and value terms during the period from 1991 to 2016. The highest share in the exports of horticultural products from India was accounted by grapes for which the major markets were Netherlands, Russia, United Kingdom, UAE, Germany and Saudi Arabia. Among the vegetables, India accounted for about 9.4 per cent of share in world exports of onion and the main destinations were Bangladesh, Malaysia, UAE and Sri Lanka. The horticultural exports have shown increased commodity diversification as well as geographical diversification due to increased market access in developed countries. Even though the tariffs have come down there by increasing the exports, the NTMs, especially quality issues in connection with sanitary and phyto-sanitary regulations have increased in the post- liberalization era. Given the inherent potential and rising competiveness of the India’s horticultural sector, the removal of product specific constraints, especially production of commodities of international standards could definitely help in sustaining the growth of horticultural exports

Ergebnisse der Scheidungsmediation

'Im folgenden Beitrag werden nach einer kurzen Darstellung des Heidelberger Mediationskonzeptes Ergebnisse aus amerikanischen Evaluationsstudien zur Scheidungsmediation zusammengestellt. Wir unterscheiden dabei zwischen erfolgsorientierten, effektorientierten und prozessualen Evaluationsergebnissen. Abschließend werden die sich daraus ergebenden Implikationen für künftige Evaluationsstudien zusammengefaßt.' (Autorenreferat

An Active Noise Control System Based on Soundfield Interpolation Using a Physics-informed Neural Network

Conventional multiple-point active noise control (ANC) systems require placing error microphones within the region of interest (ROI), inconveniencing users. This paper designs a feasible monitoring microphone arrangement placed outside the ROI, providing a user with more freedom of movement. The soundfield within the ROI is interpolated from the microphone signals using a physics-informed neural network (PINN). PINN exploits the acoustic wave equation to assist soundfield interpolation under a limited number of monitoring microphones, and demonstrates better interpolation performance than the spherical harmonic method in simulations. An ANC system is designed to take advantage of the interpolated signal to reduce noise signal within the ROI. The PINN-assisted ANC system reduces noise more than that of the multiple-point ANC system in simulations

A Two-Step Approach for Narrowband Source Localization in Reverberant Rooms

This paper presents a two-step approach for narrowband source localization within reverberant rooms. The first step involves dereverberation by modeling the homogeneous component of the sound field by an equivalent decomposition of planewaves using Iteratively Reweighted Least Squares (IRLS), while the second step focuses on source localization by modeling the dereverberated component as a sparse representation of point-source distribution using Orthogonal Matching Pursuit (OMP). The proposed method enhances localization accuracy with fewer measurements, particularly in environments with strong reverberation. A numerical simulation in a conference room scenario, using a uniform microphone array affixed to the wall, demonstrates real-world feasibility. Notably, the proposed method and microphone placement effectively localize sound sources within the 2D-horizontal plane without requiring prior knowledge of boundary conditions and room geometry, making it versatile for application in different room types

Affiliation und Kontrolle in Partnerschaften

'Die von den beiden Autoren geplante Längsschnittstudie hat das Ziel, Unterschiede im interpersonalen Verhalten zufriedener und unzufriedener Partner zu identifizieren und den Einfluß dieses interpersonalen Verhaltens auf die Partnerschaftsstabilität und -zufriedenheit zu einem späteren Zeitpunkt zu untersuchen. Unterschiede vor allem im Ausmaß feindselig-kontrollierenden und freundlich-autonomiegewährendem Verhaltens werden erwartet.' (Autorenreferat

Power Response and Modal Decay Estimation of Room Reflections from Spherical Microphone Array Measurements using Eigenbeam Spatial Correlation Model

Modal decays and modal power distribution in acoustic environments are key factors in deciding the perceptual quality and performance accuracy of audio applications. This paper presents the application of the eigenbeam spatial correlation method in estimating the time-frequency-dependent directional reflection powers and modal decay times. The experimental results evaluate the application of the proposed technique for two rooms with distinct environments using their room impulse response (RIR) measurements recorded by a spherical microphone array. The paper discusses the classical concepts behind room mode distribution and the reasons behind their complex behavior in real environments. The time-frequency spectrum of room reflections, the dominant reflection locations, and the directional decay rates emulate a realistic response with respect to the theoretical expectations. The experimental observations prove that our model is a promising tool in characterizing early and late reflections, which will be beneficial in controlling the perceptual factors of room acoustics.Research Council (ARC) Discovery Project Grant No. DP180102375

Motive-Oriented Psychotherapeutic Relationship Facing a Patient Presenting with Narcissistic Personality Disorder: A Case Study

Motive-oriented therapeutic relationship (MOTHER), a prescriptive concept based on an integrative form of case formulation, the Plan Analysis (PA) method (Caspar, in: Eells (ed.), Handbook of psychotherapy case formulations, 2007), has shown to be of particular relevance for the treatment of patients presenting with personality disorders, in particular contributing to better therapeutic outcome and to a more constructive development of the therapeutic alliance over time (Kramer et al., J Nerv Ment Dis 199:244–250, 2011). Several therapy models refer to MOTHER as intervention principle with regard to borderline and Narcissistic Personality Disorder (NPD) (Sachse et al., Clarification-oriented psychotherapy of narcissistic personality disorder, 2011; Caspar and Berger, in: Dulz et al. (eds.), Handbuch der Borderline-Störungen, 2011). The present case study discusses the case of Mark, a 40-year-old patient presenting with NPD, along with anxious, depressive and anger problems. This patient underwent a seven-session long pre-therapy process, based on psychiatric and psychotherapeutic principles complemented with PA and MOTHER, in preparation for further treatment. MOTHER will be illustrated with patient–therapist verbatim from session 4 and the links between MOTHER and confrontation techniques will be discussed in the context of process-outcome hypotheses, in particular the effect of MOTHER on symptom reduction. This research was supported by SNSF and funded by Grant No: 100014_134562/1

Power Response and Modal Decay Estimation of Room Reflections from Spherical Microphone Array Measurements Using Eigenbeam Spatial Correlation Model

Modal decays and modal power distribution in acoustic environments are key factors in deciding the perceptual quality and performance accuracy of audio applications. This paper presents the application of the eigenbeam spatial correlation method in estimating the time-frequency-dependent directional reflection powers and modal decay times. The experimental results evaluate the application of the proposed technique for two rooms with distinct environments using their room impulse response (RIR) measurements recorded by a spherical microphone array. The paper discusses the classical concepts behind room mode distribution and the reasons behind their complex behavior in real environments. The time-frequency spectrum of room reflections, the dominant reflection locations, and the directional decay rates emulate a realistic response with respect to the theoretical expectations. The experimental observations prove that our model is a promising tool in characterizing early and late reflections, which will be beneficial in controlling the perceptual factors of room acoustics