1,579 research outputs found
Evaluation and Credentialing in Digital Music Communities
An examination of the use of digital badges as a reward for both casual online music evaluators and professional musicians. Professional and amateur musicians alike use social media as a platform for showcasing and promoting their music. Social media evaluation practicesârating, ranking, voting, âliking,â and âfriendingâ by ordinary users, peers, and criticsâhave become essential promotional tools for musicians. In this report, H. Cecilia Suhr examines one recent development in online music evaluation: the use of digital badges to aid in assessment and evaluation. Digital badges have emerged in recent years as a potential credentialing method in informal learning environments. Suhr explores online music communities' use of digital badges as a reward for both casual music evaluators and musicians. Suhr examines the intersection of evaluation and gamification in Spotify's âHit or Notâ game, in which players assess a song's hit potential and receive digital badges as rewards, and considers the implications of turning music evaluation into a game. She then explores in detail the development of peer and professional critics on Indaba Music, a cloud-based collaboration platform where musicians earn badges through participating in contests. Suhr considers the emerging challenges and shortcomings of contest-based virtual communities and the value of badges, as perceived by Indaba musicians. She investigates to what extent digital badges can effectively represent and credit musicians' accomplishments and merits; describes the challenges, benefits, and shortcomings of digital badges as an evaluation mechanism; and compares the use of digital badges in assessing creativity to their use in learning and credentialing institutions
Evaluation and Credentialing in Digital Music Communities
An examination of the use of digital badges as a reward for both casual online music evaluators and professional musicians.Professional and amateur musicians alike use social media as a platform for showcasing and promoting their music. Social media evaluation practicesârating, ranking, voting, âliking,â and âfriendingâ by ordinary users, peers, and criticsâhave become essential promotional tools for musicians. In this report, H. Cecilia Suhr examines one recent development in online music evaluation: the use of digital badges to aid in assessment and evaluation. Digital badges have emerged in recent years as a potential credentialing method in informal learning environments. Suhr explores online music communities' use of digital badges as a reward for both casual music evaluators and musicians.Suhr examines the intersection of evaluation and gamification in Spotify's âHit or Notâ game, in which players assess a song's hit potential and receive digital badges as rewards, and considers the implications of turning music evaluation into a game. She then explores in detail the development of peer and professional critics on Indaba Music, a cloud-based collaboration platform where musicians earn badges through participating in contests. Suhr considers the emerging challenges and shortcomings of contest-based virtual communities and the value of badges, as perceived by Indaba musicians. She investigates to what extent digital badges can effectively represent and credit musicians' accomplishments and merits; describes the challenges, benefits, and shortcomings of digital badges as an evaluation mechanism; and compares the use of digital badges in assessing creativity to their use in learning and credentialing institutions
Influence of Pure Dephasing on Emission Spectra from Single Photon Sources
We investigate the light-matter interaction of a quantum dot with the
electromagnetic field in a lossy microcavity and calculate emission spectra for
non-zero detuning and dephasing. It is found that dephasing shifts the
intensity of the emission peaks for non-zero detuning. We investigate the
characteristics of this intensity shifting effect and offer it as an
explanation for the non-vanishing emission peaks at the cavity frequency found
in recent experimental work.Comment: Published version, minor change
Setting up and modelling of overflowing fed-batch cultures of Bacillus subtilis for the production and continuous removal of lipopeptides
This work is related to the setup of overflowing exponential fed-batch
cultures (O-EFBC) derived from carbon limited EFBC dedicated to the production
of mycosubtilin, an antifungal lipopeptide belonging to the iturin family.
O-EFBC permits the continuous removal of the product from the bioreactor
achieving a complete extraction of mycosubtilin. This paper also provides a
dynamical Monod-based growth model of this process that is accurate enough to
simulate the evolution of the specific growth rate and to correlate it to the
mycosubtilin specific productivity. Two particular and dependant phenomena
related to the foam overflow are taken into account by the model: the outgoing
flow rate of a broth volume and the loss of biomass. Interestingly, the biomass
concentration in the foam was found to be lower than the biomass concentration
in the bioreactor relating this process to a recycling one. Parameters of this
model are the growth yield on substrate and the maximal specific growth rate
estimated from experiments led at feed rates of 0.062, 0.071 and 0.086 h --1.
The model was extrapolated to five additional experiments carried out at feed
rates of 0.008, 0.022, 0.040, 0.042 and 0.062 h --1 enabling the correlation of
the mean specific growth rates with productivity results. Finally, a feed rate
of 0.086 h --1 corresponding to a mean specific growth rate of 0.070 h --1
allowed a specific productivity of 1.27 mg of mycosubtilin g --1 of dried
biomass h --1
Risk assessment and mapping of extreme floods in non-dyked communities along the Elbe and Mulde Rivers
International audienceAssessing and mapping damage risk of floods for large river basins is still in its infancy. Damage risk is understood to be the combination of flood hazard and the vulnerability of communities to a flood of a particular return period. Risk is calculated and mapped for two communities in which dykes are not located for flood protection: Meissen on the Elbe River and Döbeln in the Mulde catchment. Different methodologies for the computation of flood depth and inundation extent of varying flood return periods (hazard) are compared. Exposure and relative damage to the flooding (vulnerability) based on land-use coverages of different scale are also compared and discussed. A property asset coverage completes the data requirements for the construction of the risk maps. Recommendations for continued research on risk assessments of large river basins conclude the study
Antibubbles - Experimentelle ZugÀnge
So als hĂ€tte man bei einer gewöhnlichen Seifenblase die Materialien Luft und Wasser vertauscht, bestehen Antibubbles aus einer Wasserkugel, die durch eine dĂŒnne Luftschicht vom umgebenden Wasser getrennt ist. Diese fragilen, schillernden âPerlenâ, die jeder mit etwas Ăbung herstellen kann, werfen eine Reihe physikalischer Fragen auf, von denen sich einige mit schulischen Mitteln beantworten lassen. Weil die Totalreflexion den Einblick in das Innere der Antibubbles einschrĂ€nkt, bleibt ihre genaue Beschaffenheit weitgehend im Verborgenen. Dennoch gelingt mit mechanischen und optischen Methoden gewissermaĂen ein Blick durchs SchlĂŒsselloch, der AufschlĂŒsse ĂŒber ihren Aufbau und ihre Dynamik liefert
Antibubbles - Experimentelle ZugÀnge
So als hĂ€tte man bei einer gewöhnlichen Seifenblase die Materialien Luft und Wasser vertauscht, bestehen Antibubbles aus einer Wasserkugel, die durch eine dĂŒnne Luftschicht vom umgebenden Wasser getrennt ist. Diese fragilen, schillernden âPerlenâ, die jeder mit etwas Ăbung herstellen kann, werfen eine Reihe physikalischer Fragen auf, von denen sich einige mit schulischen Mitteln beantworten lassen. Weil die Totalreflexion den Einblick in das Innere der Antibubbles einschrĂ€nkt, bleibt ihre genaue Beschaffenheit weitgehend im Verborgenen. Dennoch gelingt mit mechanischen und optischen Methoden gewissermaĂen ein Blick durchs SchlĂŒsselloch, der AufschlĂŒsse ĂŒber ihren Aufbau und ihre Dynamik liefert
Combinatorial sputter synthesis of single-phase La(XYZ)O perovskite thin film libraries: a new platform for materials discovery
Compositionally complex perovskites provide the opportunity to develop stable
and active catalysts for electrochemical applications. The challenge lies in
the identification of single-phase perovskites with optimized composition for
high electrical conductivity. Leveraging a recently discovered effect of
self-organized thin film growth during reactive sputtering, La-Co-Mn-O and
La-Co-Mn-Fe-O perovskite (ABO3) thin film materials libraries are synthesized.
These show phase-pure La-perovskites over a wide range of chemical composition
variation for the B-site elements for deposition temperatures equal to or
higher than 300C. It is demonstrated that this approach enables the
discovery and tailoring of chemical compositions for desired optical bandgap
and electrical conductivity, and thereby opens the path for the targeted
development of e.g. new high-performance electrocatalysts
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