427 research outputs found
Other-regarding behaviour: Testing guilt- and reciprocity-based models
We analyse two types of belief-dependant models of social preferences: guilt aversion and reciprocity. In particular, we test the relevance of their input variables (second-order beliefs and general dispositions for guilt/reciprocity). The data confirm the predictions of belief-dependant models. Both second-order beliefs and a participant's sensitivity to guilt/reciprocity are relevant for the decisions taken. Second-order beliefs appear to have an inverse U-shaped effect on the extent of kind behaviour.social preferences, other-regarding behaviour, belief-dependent models, experiments, trust game, guilt aversion, beliefs, psychological game theory, emotions, reciprocity
Deepening inside the homonyms of 'Wildbacher' by means of SSR markers
Sixteen accessions of the grapevine cultivar 'Wildbacher' coming from different European repositories and from Styrian and Italian private vineyards were analysed by genetic fingerprinting with SSR markers. Five different molecular profiles were found, confirming that the name 'Wildbacher' is commonly used as a homonym. Several new genotypes could be linked to the previous list of the 'Wildbacher' family. In particular, in Italian commercial vineyards two main 'Wildbacher' varieties defined by A and B genetic profiles were found. They correspond to the two reference genotypes from Styria, 'Wildbacher Blau' ('Blauer Wildbacher)' and 'Wildbacher SpƤtblau'. In both countries 'Wildbacher Blau' represents the most spread and better performing type and it is earlier ripening compared to 'Wildbacher SpƤtblau'. They were morphologically and genetically very similar to each other and they shared at least one allele at each of the 11 SSR loci analyzed for cultivar identification. Three different other 'Wildbacher' genotypes from a German collection were identified as individual cultivars. While 'RotblƤttriger' (genotype C) and 'FrĆ¼hblau' from Germany (genotype D) showed some genetic similarity with A and B genotypes, E 'Wildbacher', coming from Hungary, proved to have a distinct genetic profile. Close relationship to the key variety (for the development of European diversity) 'Heunisch' is indicated by sharing one allele at all loci investigated so far. There exist some indications that the second parent is an extinct wild vine. Evaluation of morphological parameters resulted in some differences among all five genotypes.
Fluktuacije ulova nekih pelagiÄnih vrsta riba u Mediteranu
U radu su analizirani 63 godine dugaÄki podaci o ulovu tune (Thunnus thynnus) i srdele (Sardina pilchardus) u Mediteranu, metodom spektralne (Fourierove) analize i kros korelacjom. Analiza je pokazala da ulov tune sadrži cikliÄne komponente od 2.6, 3.65, 5.64, 7.75, 10.34 and 15.5 i verovatno 31 godinu, dok su u ulovu srdele najizraženije bile amplitude od 2.44, 3.65, 6.2, 7.75 i 10.34 godina. Prema tome, oba su vremenska niza bila koherentna u ciklusima od 3.65, 7.75 i 10.34 godina. TakoÄe je ustanovljeno da je ulov tune koherentan sa indeksom severoatlantske oscilacije (NAO) i to u periodima od 2, 3.35, 4.43, 6.89, 10.34 i verovtno 31 godina. Ovo ukazuje da klimatski ciklusi utiÄu na fluktuacije populacije ove ribe. Nadalje, uporeÄenje fluktuacija ulova tune u zapadnom i istoÄnom Mediteranu je pokazalo da su one potpuno sinhrone
Privredni ribolov na Dunavu u Srbiji
U radu se daje pregled slatkovodnog ribarstva sa aspekta upravljanja, ekspolatacije ribljih resursa, tržiÅ”ta ribom, legislative koja ureÄuje delatnost ribarstva, kao i problemi sektora ribarstva u Srbiji. Istraživanje i analiza privrednog ribolova na Dunavu kroz Srbiju (588 km toka) sprovedeno je prikupljanjem podataka ribarske statistike za period od 1948. do 2010. godine, njihovim unoÅ”enjem u elektronsku bazu i analiziranjem uz koriÅ”Äenje razliÄitih metoda. StatistiÄki podaci ukljuÄuju ukupan ulov, ulov rekreativnog i privrednog ribolova, ulov privredno znaÄajnih vrsta i alohtonih vrsta. KoriÅ”Äenjem anketnog upitnika za ribare dobijeni su podaci o demografskoj strukturi ribara koji se bave ribarenjem kao osnovnom delatnoÅ”Äu, o sastavu ulova, koliko je ribarstvo perspektivna privredna grana i koji su problemi i potencijalna reÅ”enja.
VeÄina ribara pripada starosnoj grupi koja je u opsegu od 45 do 50 godina. Privredni ribolov je važna ekonomska delatnost i predstavlja osnovni izvor prihoda za veÄinu ribara. TržiÅ”te slatkovodnom ribom je neureÄena oblast koja zavisi od liÄnog zalaganja i odgovornosti pojedinca koji ima interes u prodaji ribe. Ribarstvo na Dunavu u Srbiji je veÄ dugi niz godina u procesu tranzicije ka tržiÅ”noj ekonomiji.
DugoroÄne fluktuacije hidroloÅ”kih podataka (vodostaj) uporeÄivane su sa fluktuacijama godiÅ”njeg ulova ribe iz Dunava kako bi se uoÄila eventualna meÄusobna zavisnost i uporedili njihovi trendovi.
Rezultati ovog istraživanja treba da posluže kao pregled stanja sektora sa svim postojeÄim nedostacima koje treba ispraviti u cilju Å”to uspeÅ”nijeg upravljanja ribarstvom na Dunavu i ostalim rekama u Srbiji gde je zastupljen privredni ribolov
Complete Genome Sequences of Mycobacterium smegmatis Phages Chewbacca, Reptar3000, and Riparian, Isolated in Las Vegas, Nevada
Here, we present the complete genome sequences of Mycobacterium smegmatis phages Chewbacca, Reptar3000, and Riparian, isolated from soil in Las Vegas, NV. The phages were isolated and annotated by undergraduate students enrolled in the Phage Discovery course offered by the School of Life Sciences at the University of Nevada, Las Vega
On the Amplitude of Convective Velocities in the Deep Solar Interior
We obtain lower limits on the amplitude of convective velocities in the deep
solar convection zone based only on the observed properties of the differential
rotation and meridional circulation together with simple and robust dynamical
balances obtained from the fundamental MHD equations. The linchpin of the
approach is the concept of gyroscopic pumping whereby the meridional
circulation across isosurfaces of specific angular momentum is linked to the
angular momentum transport by the convective Reynolds stress. We find that the
amplitude of the convective velocity must be at least 30 m s in the
upper CZ () and at least 8 m s in the lower CZ () in order to be consistent with the observed mean flows. Using the base
of the near-surface shear layer as a probe of the rotational influence, we are
further able to show that the characteristic length scale of deep convective
motions must be no smaller than 5.5--30 Mm. These results are compatible with
convection models but suggest that the efficiency of the turbulent transport
assumed in advection-dominated flux-transport dynamo models is generally not
consistent with the mean flows they employ.Comment: 16 pages, 4 figures, accepted to the Astrophysical Journa
Calibrating Convective properties of Solar-like Stars in the Kepler Field of View
Stellar models generally use simple parametrizations to treat convection. The
most widely used parametrization is the so-called "Mixing Length Theory" where
the convective eddy sizes are described using a single number, \alpha, the
mixing-length parameter. This is a free parameter, and the general practice is
to calibrate \alpha using the known properties of the Sun and apply that to all
stars. Using data from NASA's Kepler mission we show that using the
solar-calibrated \alpha is not always appropriate, and that in many cases it
would lead to estimates of initial helium abundances that are lower than the
primordial helium abundance. Kepler data allow us to calibrate \alpha for many
other stars and we show that for the sample of stars we have studied, the
mixing-length parameter is generally lower than the solar value. We studied the
correlation between \alpha and stellar properties, and we find that \alpha
increases with metallicity. We therefore conclude that results obtained by
fitting stellar models or by using population-synthesis models constructed with
solar values of \alpha are likely to have large systematic errors. Our results
also confirm theoretical expectations that the mixing-length parameter should
vary with stellar properties.Comment: 16 pages, 4 figures, accepted for publication in ApJ
Trouble at the top: The construction of a tenant identity in the governance of social housing organizations
The project of citizen governance has transformed the social housing sector in England where 20,000 tenants now sit as directors on the boards of housing associations, but the entrance of social housing tenants to the boardroom has aroused opposition from the chief executives of housing companies and triggered regulatory intervention from government inspectors. This paper investigates the cause of these tensions through a theoretical framework drawn from the work of feminist philosopher Judith Butler. It interprets housing governance as an identificatory project with the power to constitute tenant directors as regulated subjects, and presents evidence to suggest that this project of identity fails to completely enclose its subject, allowing tenant directors to engage in āidentity workā that threatens the supposed unity of the board. The paper charts the development of antagonism and political tension in the board rooms of housing companies to present an innovative account of the construction and contestation of identities in housing governance
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