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The Prager musikalisches Album (1838) and the nineteenth-century salon as cultural practice
Bunzel, Anja
2023 - anglický
This article deals with a collection of songs and piano pieces, the Prager musikalisches Album, published in 1838, asking two central questions. Drawing on different concepts of the musical work (Werkbegriff), I explore whether the album can be considered a work rather than a loose collection of multiple works. Within the musicological discourse there have been many attempts at defining these terms, ranging from quite narrow categorisations based on aspects of instrumentation, musical form, or stylistic matters to more open approaches encompassing the communicative process and viewing the history of genre as cultural history. Drawing on the latter, I suggest that the Prager musikalisches Album is a prime example of collective authorship, which opens up a second question, namely that of authorship. Authorship may embrace aspects of agency that exceed the realms of the person who penned a musical, literary, or artistic work. Indeed, it may be shaped by performers, audiences, presses/ salespeople, dedicatees, critics, patrons, and anyone else who has an impact on any given work at the time of its creation and/or publicization. By taking this perspective, I suggest that the Prager musikalisches Album is both reflective and representative of nineteenth-century salon culture, within whose context the album was embedded. Offering a holistic analysis of the album and its context, I use this article as a springboard to advocate for a musical historiography that takes into account the full breadth of musical culture, and which embraces, besides composers and poets, a number of other cultural agents that are often overlooked within more traditional music-historical considerations.
Klíčová slova:
nineteenth-century salon; genre; work; Prague; authorship
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
The Prager musikalisches Album (1838) and the nineteenth-century salon as cultural practice
This article deals with a collection of songs and piano pieces, the Prager musikalisches Album, published in 1838, asking two central questions. Drawing on different concepts of the musical work ...
Effect of aging on mechanical properties of 3D printed samples using stereolithography
Drechslerová, V.; Falta, J.; Fíla, T.; Dvořák, R.; Kytýř, Daniel
2023 - anglický
This paper focuses on stereolithography (an additive manufacturing technology working on the principle of curing liquid resins layer by layer using ultraviolet radiation) and the effect of aging on the mechanical properties of the material and printed samples. The aging of the material could be a problem for its subsequent use as the stability of the mechanical properties would not be maintained and unwanted deterioration of the material could occur. As part of the research, sets of samples were printed and subjected to different aging methods and subsequently subjected to quasi-static and dynamic uni-axial load tests. From the data obtained, the basic mechanical properties of the material were calculated and compared with each other. The aim of this paper was to investigate whether aging process causes significant changes in the mechanical properties of the materials used, which could have a consequential impact on their use in different industries.
Klíčová slova:
stereolithography; aging; mechanical properties
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Effect of aging on mechanical properties of 3D printed samples using stereolithography
This paper focuses on stereolithography (an additive manufacturing technology working on the principle of curing liquid resins layer by layer using ultraviolet radiation) and the effect of aging on ...
Computed tomography system with strict real-time synchronization for in-situ 3D analysis of periodically vibrating objects
Rada, Václav; Fíla, Tomáš; Zlámal, Petr; Koudelka_ml., Petr; Šleichrt, Jan; Macháček, Michael; Vavřík, Daniel; Kytýř, Daniel
2023 - anglický
In the contribution, we present a laboratory system capable of X-ray computed tomography (XCT) scanning of an periodically moving or oscillating object. The system is an in-house developed XCT setup with electromagnetic voice coil actuator mounted on top of the rotary stage of the setup. The strict synchronization of the components, the rotary stage, the electromagnetic actuator movement and the detector readout is accomplished with use of the detector hardware trigger and hard real-time Linux operating system. Cylindrical sample manufactured from epoxy resin with metal particles to enable movement tracking is scanned in a stationary position and during periodical movement induced by the vibration stage. The volumetric data of the scans is compared and the results of this contribution represent an important step towards identification of defects through modal analysis of in-situ harmonically vibrating object.
Klíčová slova:
computed tomography; hardware trigger; harmonic motion; realtime synchronization
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Computed tomography system with strict real-time synchronization for in-situ 3D analysis of periodically vibrating objects
In the contribution, we present a laboratory system capable of X-ray computed tomography (XCT) scanning of an periodically moving or oscillating object. The system is an in-house developed XCT setup ...
Analysis suggestion for vehicle scanning method
Bayer, Jan
2023 - anglický
An analytical approach is suggested that can be conveniently applied in the framework of the Vehicle scanning method (VSM). It assumes that the modal parameters of a bridge will be imported from a finite element (FE) program into MATLAB, where the structural response caused by a moving mass and a moving spring mass is solved using coupling equations and numerical integration. A mathematical formulation of the solution is presented together with a short numerical case study that compares the results to a traditional closed form solution. It is shown that when comparing both forms of analysis the suggested approach is more accurate in the case of slow velocities of the passing sprung mass. Other advantages are that the method allows for the mass of the vehicle or (tractor) towing vehicle and a damping \nto be included in the calculation. The user-friendly preprocessing in commercial FE programs can also be considered an advantage.
Klíčová slova:
moving vehicle; vehicle scanning method; natural frequency; finite element analysis
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Analysis suggestion for vehicle scanning method
An analytical approach is suggested that can be conveniently applied in the framework of the Vehicle scanning method (VSM). It assumes that the modal parameters of a bridge will be imported from a ...
A short study on self-balancing of vertical rotors mounted in passive contactless bearings
Zapoměl, Jaroslav; Kozánek, Jan
2023 - anglický
Energy losses and wear of the support elements of high-speed rotors can be reduced by mounting the rotors in stable passive contactless bearings, the operation of which is based on magnetic levitation. The goal of the conducted research was to investigate applicability of selfbalancing device added to vertical rotors supported by bearings showing low stiffness and damping, which is a specific property of passive magnetic bearings. This paper deals with applicability and efficiency of self-balancing devices added to vertical rotors supported by bearings having very low stiffness and damping, which corresponds to the properties of magnetic frictionless bearings.
Klíčová slova:
self-balancing of rotors; passive contactless bearings; the influence of external damping
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
A short study on self-balancing of vertical rotors mounted in passive contactless bearings
Energy losses and wear of the support elements of high-speed rotors can be reduced by mounting the rotors in stable passive contactless bearings, the operation of which is based on magnetic ...
Dynamic tensile experiments of hard rubber on instron test machine under finite deformations
Šulc, Petr; Pešek, Luděk; Bula, Vítězslav; Šnábl, Pavel
2023 - anglický
This paper deals with the first experimental tests of hard rubbers under tensile harmonic loading on the axial-torsional servohydraulic Instron 8852 test machine. The objective of these experiments on cylindrical rubber specimens on this machine is to obtain stress-strain curves of rubber specimens, first considering uniaxial finite longitudinal strains for a single load cycle. Next, the hysteresis loops and their skeleton curves are compared for two selected strain measures as a function of their conjugate stress. It is shown how to obtain the dependence between elongation in the axial direction and constriction in the radial direction, which is used to determine the Cauchy stress in this configuration.
Klíčová slova:
uniaxial harmonic loading; finite deformation; second Piola-Kirchhoff stress; hysteresis loop; Green-Lagrange strain tensor
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Dynamic tensile experiments of hard rubber on instron test machine under finite deformations
This paper deals with the first experimental tests of hard rubbers under tensile harmonic loading on the axial-torsional servohydraulic Instron 8852 test machine. The objective of these experiments on ...
Structural analysis of polysaccharides from mushroom hericium Erinaceus mftccb 134
Bleha, R.; Čopíková, J.; Sushytskyi, Leonid; Vannucci, Luca; Sinica, A.; Jozífek, M.; Jablonský, I.; Klouček, P.
2023 - anglický
The aim of this research was the structural characterisation of polysaccharides isolated from fruiting bodies of the cultivating medicinal mushroom Hericium erinaceus MFTCCB 134. Cold and hot water extracts (CWE, HWE) were obtained and purified, and followed by alkali extraction from the reminder solids. The composition and structure of the fractions were analysed by FTIR spectroscopy, and neutral sugars/linkage analyses were determined by GC/FID and GC/MS, respectively. Galactose, fucose and glucose were found in purified CWE,\nwhile glucose predominated in purified HWE.
Klíčová slova:
Hericium erinaceus; polysaccharides; mushrooms
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Structural analysis of polysaccharides from mushroom hericium Erinaceus mftccb 134
The aim of this research was the structural characterisation of polysaccharides isolated from fruiting bodies of the cultivating medicinal mushroom Hericium erinaceus MFTCCB 134. Cold and hot water ...
Enhanced growth rate of diamond films at low temperature in focused microwave plasma system
Babčenko, Oleg; Bydžovská, Irena; Fait, Jan; Shagieva, Ekaterina; Ondič, Lukáš; Kromka, Alexander
2023 - anglický
The low temperature (< 500 °C) diamond film deposition on fused silica in two different focused microwave plasma systems, i.e. a multimode clamshell cavity (MCC) and a rotational ellipsoid cavity (REC) reactor, was investigated. During the experiments, the methane to hydrogen ratio, in the hydrogen-rich process gas mixture, varied from 1 % to 15 % for MCC and from 1 % to 9 % for REC. The grown films were analyzed by scanning electron microscopy and Raman shift measurements. The outcomes of the study and enhanced diamond growth at low temperatures is advantageous for overcoating of fused silica as well as thermally sensitive substrates, e.g. optical elements, photonic crystals, sensors, etc.
Klíčová slova:
well-faceted diamonds; low temperature deposition; high growth rate; low non-diamond content; focused plasma
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Enhanced growth rate of diamond films at low temperature in focused microwave plasma system
The low temperature (...
Self-balancing of vertical disc rotors supported by contactless bearings
Zapoměl, Jaroslav; Kozánek, Jan; Košina, Jan
2023 - anglický
Article discusses the self-balancing of the vertical disc rotors supported by contactless bearings on principle of diamagnetic levitation. There are three possibilities of contactless supports: permanent magnet levitation with the help of bismuth, graphite and pyrolitic graphite.
Klíčová slova:
self balancing; vertical disc rotors; contactless bearings
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Self-balancing of vertical disc rotors supported by contactless bearings
Article discusses the self-balancing of the vertical disc rotors supported by contactless bearings on principle of diamagnetic levitation. There are three possibilities of contactless supports: ...
Effect of the long-term storage methods on the stability of cartilage biomechanical parameters
Žaloudková, Blanka; Sekorová, Š.; Kopecká, B.; Kytýř, Daniel
2023 - anglický
Long-term stability of the tissue product in terms of mechanical parameters is a key factor for its expiration date. For the investigation of storage effects on the cartilage tissues the experimental mechanical loading test combined with XCT scanning for the irregular shape inspection was performed. The samples were preserved according to three different protocols using the deep-freezing and two types of saline solution preservation. The stability of the biomechanical parameters was tested within annual intervals. All samples were subjected to uni-axial compression loading using the in-house developed compact table top loading device in displacement-driven mode. Based on the measurements, the results are represented in the form of stress-strain curves and quantified as elastic modulus and ultimate compression stress. It can be concluded that no significant difference was found in neither the mechanical properties of the samples nor in the effects of each preservational method.
Klíčová slova:
stability study; cartilage; biomechanical characterisation; compression loading; XCT imaging
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Effect of the long-term storage methods on the stability of cartilage biomechanical parameters
Long-term stability of the tissue product in terms of mechanical parameters is a key factor for its expiration date. For the investigation of storage effects on the cartilage tissues the experimental ...
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