Technische Universität Berlin

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Recent Submissions
Thermische Untersuchung von Schaltungsträgern für leistungselektronische Halbleitermodule mit organischem Isolator

Bicakci, Aylin (2019)

Aufgrund der stetig steigenden Leistungsdichte in der Leistungselektronik sind immer höhere Temperaturen der Halbleiter in Leistungsmodulen die Folge, welche zu einer Leistungsbeschränkung der heutigen Module führen. Konventionelle Module bestehen häufig aus einem Direct Copper Bonded-Substrat (DCB), welches auf eine Bodenplatte (Wärmespreizer) gelötet ist. Diese Module sind aus thermischer Sic...

Mode locking in systems of globally-coupled phase oscillators

Eydam, Richard Sebastian (2019)

In systems of globally coupled phase oscillators with sufficiently structured natural frequencies, a new type of collective behavior is discovered that exists below the synchronization threshold. The solution type is distinguished by the appearance of sharp pulses in the mean field amplitude which imply a temporary high coherence among the phases. This is similar to a process known in lase...

The Role of Haptic Cues in Musical Instrument Quality Perception

Saitis, Charalampos ; Järveläinen, Hanna ; Fritz, Claudia (2018-05-03)

We draw from recent research in violin quality evaluation and piano performance to examine whether the vibrotactile sensation felt when playing a musical instrument can have a perceptual effect on its judged quality from the perspective of the musician. Because of their respective sound production mechanisms, the violin and the piano offer unique example cases and diverse scenarios to study tac...

Musical Haptics: Introduction

Papetti, Stefano ; Saitis, Charalampos (2018-05-03)

This chapter introduces to the concept of musical haptics, its scope, aims, challenges, as well as its relevance and impact for general haptics and human–computer interaction. A brief summary of subsequent chapters is given.

Sound power and timbre as cues for the dynamic strength of orchestral instruments

Weinzierl, Stefan ; Lepa, Steffen ; Schultz, Frank ; Detzner, Erik ; Coler, Henrik von ; Behler, Gottfried (2018-09-12)

In a series of measurements, the sound power of 40 musical instruments, including all standard modern orchestral instruments, as well as some of their historic precursors from the classical and the baroque epoch, was determined using the enveloping surface method with a 32-channel spherical microphone array according to ISO 3745. Single notes were recorded at the extremes of the dynamic range (...

A measuring instrument for the auditory perception of rooms: The Room Acoustical Quality Inventory (RAQI)

Weinzierl, Stefan ; Lepa, Steffen ; Ackermann, David (2018-09-10)

With the Room Acoustical Quality Inventory (RAQI), a measuring instrument for the perceptual space of performance venues for music and speech has been developed. First, a focus group with room acoustical experts determined relevant aspects of room acoustical impression in the form of a comprehensive list of 50 uni- and bipolar items in different categories. Then, n = 190 subjects rated their ac...

Cognitive Load Assessment from EEG and Peripheral Biosignals for the Design of Visually Impaired Mobility Aids

Saitis, Charalampos ; Parvez, Mohammad Zavid ; Kalimeri, Kyriaki (2018-02-28)

Reliable detection of cognitive load would benefit the design of intelligent assistive navigation aids for the visually impaired (VIP). Ten participants with various degrees of sight loss navigated in unfamiliar indoor and outdoor environments, while their electroencephalogram (EEG) and electrodermal activity (EDA) signals were being recorded. In this study, the cognitive load of the tasks was ...

Modeling Music-Selection Behavior in Everyday Life: A Multilevel Statistical Learning Approach and Mediation Analysis of Experience Sampling Data

Greb, Fabian ; Steffens, Jochen ; Schlotz, Wolff (2019-03-19)

Music listening has become a highly individualized activity with smartphones and music streaming services providing listeners with absolute freedom to listen to any kind of music in any situation. Until now, little has been written about the processes underlying the selection of music in daily life. The present study aimed to disentangle some of the complex processes among the listener, situati...

A round robin on room acoustical simulation and auralization

Brinkmann, Fabian ; Aspöck, Lukas ; Ackermann, David ; Lepa, Steffen ; Vorländer, Michael ; Weinzierl, Stefan (2019-04-30)

A round robin was conducted to evaluate the state of the art of room acoustic modeling software both in the physical and perceptual realms. The test was based on six acoustic scenes highlighting specific acoustic phenomena and for three complex, “real-world” spatial environments. The results demonstrate that most present simulation algorithms generate obvious model errors once the assumptions o...

On the authenticity of individual dynamic binaural synthesis

Brinkmann, Fabian ; Lindau, Alexander ; Weinzierl, Stefan (2017-10-04)

A simulation that is perceptually indistinguishable from the corresponding real sound field could be termed authentic. Using binaural technology, such a simulation would theoretically be achieved by reconstructing the sound pressure at a listener's ears. However, inevitable errors in the measurement, rendering, and reproduction introduce audible degradations, as it has been demonstrated in prev...

Musical Haptics

(2018)

This Open Access book offers an original interdisciplinary overview of the role of haptic feedback in musical interaction. Divided into two parts, part I examines the tactile aspects of music performance and perception, discussing how they affect user experience and performance in terms of usability, functionality and perceived quality of musical instruments. Part II presents engineering, compu...

Mapping the Recreational Value of Non-Urban Ecosystems across Europe: Combining Meta-Analysis and GIS

Schägner, Jan Philipp ; Brandner, Luke ; Hartje, Volkmar ; Maes, Joachim ; Paracchini, Maria-Luisa (2016)

We map recreational visits and the economic value per visit spatially explicit across Europe’s non-urban ecosystems using GIS, meta-analysis and geostatistical modelling techniques. Therefore, we develop a meta-analytic visitor arrival function and a meta-analytic value transfer function by regression analysis. Primary data on the dependent variables are collected from visitor monitoring and v...

GIS-Based Mapping of Ecosystem Services: The Case of Coral Reefs

Brandner, Luke ; Eppink, Florian ; Schägner, Jan Philipp ; Beukering, Pieter van ; Wagtendonk, Alfred (2015-06-03)

This chapter illustrates the process of mapping ecosystem service values with an application to coral reef recreational values in Southeast Asia. The case study provides an estimate of the value of reef-related recreation foregone, due to the decline in coral reef area in Southeast Asia, under a baseline scenario for the period 2000 – 2050. This value is estimated by combining a visitor model, ...

Monitoring recreation across European nature areas: A geo-database of visitor counts, a review of literature and a call for a visitor counting reporting standard

Schägner, Jan Philipp ; Maes, Joachim ; Brandner, Luke ; Paracchini, Maria Luisa ; Hartje, Volkmar ; Dubois, Gregoire (2017-03-17)

Nature recreation and tourism is a substantial ecosystem service of Europe’s countryside that has a substantial economic value and contributes considerably to income and employment of local communities. Highlighting the recreational value and economic contribution of nature areas can be used as a strong argument for the funding of protected and recreational areas. The total number of recreation...

Mapping ecosystem services' values: Current practice and future prospects

Schägner, Jan Philipp ; Brandner, Luke ; Maes, Joachim ; Hartje, Volkmar (2013-03-27)

Mapping of ecosystem services' (ESS) values means valuing ESS in monetary terms across a relatively large geographical area and assessing how values vary across space. Thereby, mapping of ESS values reveals additional information as compared to traditional site-specific ESS valuation, which is beneficial for designing land use policies for maintaining ESS supply. Since the well-known article b...

Synchronization and learning in networks of chemical oscillators

Fengler, Enrico (2019)

In this thesis, the collective behavior of chemical oscillators in adaptive networks with time-dependent coupling weights is studied theoretically and experimentally. About 100-150 micro meter in size catalytic beads based on the Belousov-Zhabotinsky (BZ) oscillatory chemical reaction are fixed in an array of conical slots covered by a gel layer, and are placed into contact with BZ solution in ...

Coupled system of Maxwell equations and circuit equations in electro-magnetism

Niroomand Rad, Helia (2019)

This thesis is devoted to modeling electro-magnetic coupling, the so-called crosstalk phenomenon, in circuit simulation, where a new modeling approach via bilateral coupling of the Maxwell equations with circuit equations is considered. Using the bilaterally coupled model allows full simulation of the crosstalk phenomenon in the evolution of time, when the disturbances generated by the excitati...

Towards exact molecular dynamics simulations with invariant machine-learned models

Chmiela, Stefan (2019)

Molecular dynamics (MD) simulations constitute the cornerstone of contemporary atomistic modeling in chemistry, biology, and materials science. However, one of the widely recognized and increasingly pressing issues in MD simulations is the lack of accuracy of underlying classical interatomic potentials, which hinders truly predictive modeling of dynamics and function of (bio)molecular systems. ...

Untersuchungen an weich schaltenden DC/DC Konvertern zur Versorgung von Hochleistungs-Diodenlasern

Winkler, Tammo (2019)

Durch die Steigerung der Dynamik von Laser-Materialbearbeitungsprozessen mittels Diodenlasern wächst der Bedarf an hochdynamischen Stromquellen, mit denen die Emitter betrieben werden können. Dabei nehmen mannigfaltige Randbedingungen Einfluss auf den grundlegenden Systemaufbau der stromgeregelten leistungselektronischen Systeme. Es wird das industrielle Einsatzgebiet der Stromquellen beschrie...

On the spatial resolution of virtual acoustic environments for head movements in horizontal, vertical, and lateral direction

Lindau, Alexander ; Weinzierl, Stefan (2009)

Dynamic binaural synthesis based on binaural room impulse responses (BRIRs) for a discrete grid of head orientations can provide an auralization naturally responding to head movements in all rotational degrees of freedom. Several experiments have been conducted in order to determine thresholds of just detectable BRIR grid resolution for all three rotational directions of head movements using an...