Search results for " segregation"
showing 10 items of 84 documents
The grass is always greener on the other side of the fence: the effect of misperceived signalling in a network formation process
2007
Social and economic networks are becoming increasingly popular in the last ten years, because of both the application of game theory to the network formation processes4, and the study of stochastic processes that fit the statistical properties of real world social networks.5 In the very recent years there have also been attempts to combine the contribution of these two streams of research, trying to find strategic models whose equilibria resemble the empirical data.6 A well known source of debate in the game theoretical approach is the incompatibility between stability and efficiency: in most of the models Nash equilibria are actually not the network architectures that maximize the overall …
Improved performance in flexible organic solar cells by using copolymeric phase-separation modulators
2018
One of the main problems related to the low performance of the organic solar cells (OSCs), concerns the low mobility of the materials constituting the heterojunction. Indeed, the poor charge transport in the active layer is the principal cause of a competition between separation and recombination of the photogenerated carriers. In this regard, a major obstacle to enhance OSCs efficiency is developing strategies to optimize the exciton dissociation and, consequently, the charge collection at the electrodes. Donor and acceptor systems must be well mixed on the length scale of 5 – 20 nm (exciton diffusion length) to meet the criteria for efficient exciton dissociation. In addition, the network…
Controlling the Phase Segregation in Mixed Halide Perovskites through Nanocrystal Size
2019
Mixed halide perovskites are one of the promising candidates in developing solar cells and light-emitting diodes (LEDs), among other applications, because of their tunable optical properties. Nonetheless, photoinduced phase segregation, by formation of segregated Br-rich and I-rich domains, limits the overall applicability. We tracked the phase segregation with increasing crystalline size of CsPbBr3–xIx and their photoluminescence under continuous-wave laser irradiation (405 nm, 10 mW cm–2) and observed the occurrence of the phase segregation from the threshold size of 46 ± 7 nm. These results have an outstanding agreement with the diffusion length (45.8 nm) calculated also experimentally f…
Mass Segregation in the Open Cluster NGC 2422
2003
UBVRI photometry of the open cluster NGC2422 (age ~10 8 yr) down to a limiting magnitude V ≃ 19 is used to study the cluster spatial distribution and the luminosity and mass functions. From the Color-Magnitude Diagram (CMD), we obtained a list of candidate cluster members based on a photometric criterion. Using a comparison field region and an iterative procedure, a correction for contaminating field stars has been inferred in order to obtain the luminosity and the mass functions in the M=0.4 -3.5 M ⊙ range. By analyzing the spatial distribution, we infer that a non-negligible number of cluster stars lie outside our investigated region. We estimate a correction to the mass function of the …
A new self-compatibility haplotype in the sweet cherry 'Kronio', S5' attributable to a pollen-part mutation in the SFB gene
2008
‘Kronio’ is a Sicilian cultivar of sweet cherry (Prunus avium), nominally with the incompatibility genotype S 5 S 6 , that is reported to be naturally self-compatible. In this work the cause of its self-compatibility was investigated. Test selfing confirmed self-compatibility and provided embryos for analysis; PCR with consensus primers designed to amplify S-RNase and SFB alleles showed that the embryos were of two types, S 5 S 5 and S 5 S 6 , indicating that S 6 pollen failed, but S 5 succeeded, perhaps because of a mutation in the pollen or stylar component. Stylar RNase analysis indicated active S-RNases for both S 5 and S 6 . The S-RNase alleles were cloned and sequenced; and sequences …
Jacqueline Woodson’s narrative style in The Other Side: An African American picture book for children
2012
The Other Side (2001) is a children’s story with multicultural characters and themes that can be regarded as an aesthetic exploration of the human experience in the process of the acquisition of knowledge. Following the Black Arts Movement, Jacqueline Woodson’s work portrays many of the issues that are present in the real world but seldom appear in children’s literature, such as racial division or interracial relationships. Using the metaphor of a fence, this African American author reveals issues of loneliness and friendship, inclusion and exclusion, and the overcoming of prejudice and segregation through the wisdom of Clover and Annie, an African American and a white girl, who become frie…
Segregati e connessi. ‘Nuovi migranti’: profilo sociolinguistico e costruzione dei dati
2021
Recent migrations show unprecedented characteristics in terms of migratory routes, migrants’ individual profiles and needs (also linguistic) and the conditions of isolation and segregation in the arrival contexts.
A distributional approach for measuring wage discrimination and occupational discrimination separately
2011
Numerous statistical methodologies regarding the study of discrimination are based on the well-known Blinder-Oaxaca (1973) decomposition. This divides the wage differential between men and women into one part, which can be explained by differences in individual characteristics, and another part, which is interpreted as discrimination. This decomposition ignores any distributional issues in evaluating discrimination, thus permitting, undesirably, compensation between positively and negatively discriminated women. Jenkins (1994) has criticized this aspect, instead preferring a distributional approach. Del Rio et al. (2010), using a distributional approach, which hinges on the deprivational a…
Jessie Bernard. Paradossi dei matrimoni felici e della maternità incondizionata
2022
Questo volume introduce per la prima volta in Italia il pensiero di Jessie Bernard, la cui produzione scientifica sui temi del genere e del femminile – dal matrimonio alla maternità, dalla segregazione alla mobilità professionale – ha fornito un importante contribuito alla rivoluzione femminista, proponendo un’analisi articolata del “sistema coniugale americano” e dei condizionamenti operanti sulle famiglie bianche e su quelle di colore in tema di maternità. Il pensiero di Jessie Bernard non si situa in una lotta ideologica, ma nell’esperienza di una studiosa che ha “scalato le montagne” dell’irrisione coniugale, della sufficienza accademica e del sospetto femminista. Una riflessività – que…
Adaptive radiation along a thermal gradient: preliminary results of habitat use and respiration rate divergence among whitefish morphs.
2014
Adaptive radiation is considered an important mechanism for the development of new species, but very little is known about the role of thermal adaptation during this process. Such adaptation should be especially important in poikilothermic animals that are often subjected to pronounced seasonal temperature variation that directly affects metabolic function. We conducted a preliminary study of individual lifetime thermal habitat use and respiration rates of four whitefish (Coregonus lavaretus (L.)) morphs (two pelagic, one littoral and one profundal) using stable carbon and oxygen isotope values of otolith carbonate. These morphs, two of which utilized pelagic habitats, one littoral and one …