Acoustic Investigation of Textile Fabrics

Why is it possible to distinguish between different textile fabrics by just touching them and moving your hand over them and listening to the sound? Particularly for high-quality woven fabrics, e.g. used for tailor-made suits, it is quite common that the dressmaker listens to the sound as their hand rubs the fabric. Can this approach be translated into a technical measurement? What could a sound analysis tell us about the fabric properties? As a first simple approach, we used a record player to rotate different cotton fabrics, and tested fine tips from diverse materials, such as plastic pipettes, pens, glass tips, etc. Our results show clear differences between the textile fabrics, which can be attributed to different yarn, knitted or woven structures. While the rotational mode of investigation impedes fully automated fast Fourier transform (FFT) evaluations, our first results suggest de¬veloping this promising method further.

The Voice of the Lord from a Record Player (Vietnamese Highlands, 1960s)

In this paper, I present a short excerpt from an 18-hour-long Bru life history recorded in 1989 in the Central Vietnamese Highlands among the Bru/Vân Kiều of Quảng Trị. The excerpt sheds light on the circumstances of Christian evangelization among the Bru through the recollections of a Bru man who was not Christian himself but was in contact with the key protagonists of the events, the missionaries and the evangelized Bru people. The interview reveals on how the evangelized and non-evangelized viewed the evangelists. What were the ways of promoting evangelization? Were the Bru impressed by the world of the evangelizers? How did the Bru conceive of the evangelizers? How convincing did they find their arguments? Beside its immanent value, this intercultural encounter has a significance beyond itself insofar as it is situated in and reflective of the icy political and ideological milieu of the Vietnam War in the 1960s–1970s, the impacts of which were still lingering when the recording was made.

About When We Collide: A Generative and Collaborative Sound Installation

The idea for When We Collide sprang from Douglas Hofstader’s metaphor of creativity as the meeting between records and record players, appearing in his 1979 book "Gödel, Escher, Bach: An Eternal Golden Braid". In our case, the records are soundfiles, whilst the record player is a generative system. The player analyses, selects, mixes, transforms, and spatialises the material created by the composers (monophonic and quadraphonic soundfiles). The system negotiates between algorithms that tend towards monotony (in terms of loudness, spatialisation, and frequency spectrum) and algorithms that tend towards variability (in terms of soundfiles, transformations, and scenes). In a nutshell, the installation is a space where sonic ideas collide and co-exist.

Azo-dimethylaminopyridine-functionalized Ni(II)-porphyrin as a photoswitchable nucleophilic catalyst

We present the synthesis and the photochemical and catalytic switching properties of an azopyridine as a photoswitchable ligand, covalently attached to a Ni(II)-porphyrin. Upon irradiation with 530 nm (green light), the azopyridine switches to the cis configuration and coordinates with the Ni2+ ion. Light of 435 nm (violet) isomerizes the ligand back to the trans configuration, which decoordinates for steric reasons. This so-called record player design has been used previously to switch the spin state of Ni2+ between singlet and triplet. We now use the coordination/decoordination process to switch the catalytic activity of the dimethylaminopyridine (DMAP) unit. DMAP is a known catalyst in the nitroaldol (Henry) reaction. Upon coordination to the Ni2+ ion, the basicity of the pyridine lone pair is attenuated and hence the catalytic activity is reduced. Decoordination restores the catalytic activity. The rate constants in the two switching states differ by a factor of 2.2, and the catalytic switching is reversible.

The Soul of the Phonograph: Media-Technologies, Auditory Experience, and Literary Modernism in the Age of COVID-19

The unpredictable duration of the COVID-19 pandemic necessitates renewed reflection on our collective reliance on video platforms such as Zoom and YouTube for telecommunication and music listening purposes, which have virtually filled the gap left by widely cancelled live performances. The affectively close relationship we forge with these services today echoes a recurrent theme in literary modernism: the tendency to endow early mechanical sound reproduction machines such as the phonograph and the record player with quasi-human subjectivity, emotions, and agency. This historical topos, in turn, anticipates posthumanism’s fascination with the seamless interface between machine-intelligence and its human users. Thinking about these cultural continuities may help the Humanities articulate the crucial role of media technologies and literary discourses under exceptional circumstances.

Azo-dimethylaminopyridine functionalized Ni(II)-Porphyrin as a Photoswitchable Nucleophilic Catalyst

We present the synthesis and the photochemical and catalytic switching properties of an azopyridine as a photoswitchable ligand, covalently attached to a Ni(II)-porphyrin. Upon irradiation with 530 nm (green light), the azopyridine switches to the cis configuration and coordinates with the Ni2+ ion. Light of 435 nm (violet) isomerizes the ligand back to the trans configuration, which decoordinates for steric reasons. This so-called record player design has been used previously to switch the spin state of Ni2+ between singlet and triplet. We now use the coordination/decoordination process to switch the catalytic activity of the dimethylaminopyridine (DMAP) unit. DMAP is a known catalyst in the nitroaldol (Henry) reaction. Upon coordination to the Ni2+ ion, the basicity of the pyridine lone pair is attenuated and hence the catalytic activity is reduced. Decoordination restores the catalytic activity. The rate constants in the two switching states differ by a factor of 2.2, and the catalytic switching is reversible.

The Golden Decade of Black Business

This chapter examines black business activities in Chicago in the 1920s. Robert S. Abbott, Jesse Binga, and Anthony Overton dominated the business activities of the Black Metropolis with their control over finance and information like no others in their community and very much like the business titans found throughout other major Chicago economic enclaves. Business was national king at this time and their collective presence provided a significant part of the foundation of making the Black Metropolis a reality. The economic influence of the 1920s built to such a crescendo that other interests and activities were virtually submerged to it as an epicenter. In fact, one internal memorandum of the NAACP concluded the following: “There are so many diversified interests in Chicago that the N.A.A.C.P. really suffers greatly from indifference on the part of the people.” These diversified interests were related to economics and the emergence of a consumers'society—working for extra money from which to increase spending and buying; spending for recreation and leisure rather than just for necessity; buying property, automobiles, and the new technological devices such as the refrigerator and record player; and investing in oil exploration, stocks, bonds, and real estate.