Search results for "spheres"
showing 9 items of 329 documents
Classical nucleation theory for the crystallization kinetics in sheared liquids
2019
While statistical mechanics provides a comprehensive framework for the understanding of equilibrium phase behavior, predicting the kinetics of phase transformations remains a challenge. Classical nucleation theory (CNT) provides a thermodynamic framework to relate the nucleation rate to thermodynamic quantities such as pressure difference and interfacial tension through the nucleation work necessary to spawn critical nuclei. However, it remains unclear whether such an approach can be extended to the crystallization of driven melts that are subjected to mechanical stresses and flows. Here, we demonstrate numerically for hard spheres that the impact of simple shear on the crystallization rate…
The power of the gift: a perspective of political aesthetics
2019
According to Aristotle (Polit. 1253a) man is a “political animal” and his aim is to live in the community. Guided by this Aristotelian premise, I would like to dwell on the relevance of a relationship among individuals as the foundation of a civil society and the building of a political space. Following the Aristotelian perspective, the relationship among people acquires a political value in reference to the Greek word polis (city). Consequently, the adjective “political” indicates an idea wider than usually acknowledged and may refer to space, objects, and overall relationships among people. According to the natural model originally advocated by Aristotle, the urban space acquires a politi…
On the Bride’s side? Fra politica della dislocazione ed etica del posizionamento
2016
This paper aims at critically exploring the network geographies underlying the production, distribution and consumption of the Italian docu-film "On the Bride’s side". Through a successful crowdfunding campaign and hundreds of screenings throughout Europe, the docu- film has given rise to a wide diasporic public sphere. It is here that mainstream practices and alternative imaginations combine each other and unveil the complex and contested production of the cultural field
Two-Step Crystallization Kinetics in Colloidal Hard-Sphere Systems
2005
The crystallization kinetics of colloidal hard spheres was studied using a special Bragg spectrometer with high sensitivity. In contrast with the classical scenario we observe a two-step nucleation process: the number of crystallites increases slowly at early times, followed by a dramatic reduction at intermediate times, prior to undergoing a rapid increase at late times. We explain these results in terms of a polydispersity limited growth of crystallites, where the crystallization at early times is governed by local fractionation processes, leading to a long delay prior to final crystallization.
X-Raying the Dark Side of Venus - Scatter from Venus Magnetotail?
2016
This work analyzes the X-ray, EUV and UV emission apparently coming from the Earth-facing (dark) side of Venus as observed with Hinode/XRT and SDO/AIA during a transit across the solar disk occurred in 2012. We have measured significant X-Ray, EUV and UV flux from Venus dark side. As a check we have also analyzed a Mercury transit across the solar disk, observed with Hinode/XRT in 2006. We have used the latest version of the Hinode/XRT Point Spread Function (PSF) to deconvolve Venus and Mercury X-ray images, in order to remove possible instrumental scattering. Even after deconvolution, the flux from Venus shadow remains significant while in the case of Mercury it becomes negligible. Since s…
Emulsion-based synthesis of PLGA-microspheres for the in vitro expansion of porcine chondrocytes.
2007
Abstract The in vitro cell expansion of autologous chondrocytes is of high interest in regenerative medicine since these cells can be used to treat joint cartilage defects. In order to preserve chondrocyte phenotype, while optimizing adhesion on microspheres, several processing parameters for the microsphere synthesis were varied. In this study three different polylactide-co-glycolides were used with differing lactide–glycolide ratios (85:15 and 50:50) and differing inherent viscosities. An emulsion route was established, where the polymer was dissolved in chloroform and then injected into a stirred polyvinyl alcohol–water solution at different polymer concentrations and different stirring …
Decline in Coccolithophore Diversity and Impact on Coccolith Morphogenesis Along a Natural CO2 Gradient
2014
A natural pH gradient caused by marine CO2 seeps off Vulcano Island (Italy) was used to assess the effects of ocean acidification on coccolithophores, which are abundant planktonic unicellular calcifiers. Such seeps are used as natural laboratories to study the effects of ocean acidification on marine ecosystems, since they cause long-term changes in seawater carbonate chemistry and pH, exposing the organisms to elevated CO2 concentrations and therefore mimicking future scenarios. Previous work at CO2 seeps has focused exclusively on benthic organisms. Here we show progressive depletion of 27 coccolithophore species, in terms of cell concentrations and diversity, along a calcite saturation …
Aesthetic Perspectives on Culture, Politics, and Landscape. Appearances of the “Political”
2022
This book investigates how we are involved in politically informed structures and how they appear to us. Following different approaches in contemporary aesthetics and cultural philosophy, such as everyday aesthetics, atmosphere and aestheticization, the authors explore how embedded powers in politics, education, democracy, and landscape are analyzed through aesthetics.
Spheres of Influence on Students' Ethical Decision Making
2014
Our study contributes to the literature that explores whether age, gender, and various spheres of influence (religious principles, family values, educational training, workplace environment and peer interactions) affect perceptions of individual ethical behavior. We administered a business ethics survey to undergraduate students at a public undergraduate university in West Virginia. All respondents were asked to agree or disagree with twenty business ethics behavioral vignettes using a 4-point Likert type scale. In addition to these responses, we collected demographic information including gender, age, marital status, and academic major. Respondents were also asked to rank their personal sp…