Search results for "Solid"
showing 10 items of 3575 documents
Switch in Relative Stability between cis and trans 2-Butene on Pt(111) as a Function of Experimental Conditions: A Density Functional Theory Study
2018
International audience; The adsorption of cis and trans 2-butenes on Pt(111) has been studied as a function of hydrogen coverage OH by means of calculations based on density functional theory (DFT) with the inclusion of dispersion forces. All hydrogen coverages have been considered, from 0 to 1.00 monolayer (ML). For each case, the di-sigma and pi adsorption geometries of the olefins have been compared at a surface coverage of theta(C4H8) = 0.11 ML. Calculations of the Gibbs free energies of these systems have identified the most stable 2-butene isomer (cis or trans) as a function of coverage, temperature, and pressure. In particular, focus was placed on two sets of conditions, namely, one …
Pilsonis 31 stundā. Nabadzība : Mācību resursi
2020
1. NODARBĪBA. Problēma: Kā es varu palīdzēt nabadzīgajiem? EKONOMIKA: privāts atbalsts, bezpeļņas organizācijas. ĒTIKA: draudzība, iejūtība. PILSONĪBA: sabiedriska organizācija, aktīva līdzdalība sabiedriskajā dzīvē.
Malignant epithelial/exocrine tumors of the pancreas
2020
Summary Pancreatic malignant exocrine tumors represent the most important cause of cancer-related death for pancreatic neoplasms. The most common tumor type in this category is represented by pancreatic ductal adenocarcinoma (PDAC), an ill defined, stroma-rich, scirrhous neoplasm with glandular differentiation. Here we present the relevant characteristics of the most important PDAC variants, namely adenosquamous carcinoma, colloid carcinoma, undifferentiated carcinoma, undifferentiated carcinoma with osteoclast-like giant cells, signet ring carcinoma, medullary carcinoma and hepatoid carcinoma. The other categories of malignant exocrine tumors, characterized by fleshy, stroma-poor, circumsc…
Simulations on the mechanism of CNT bundle growth upon smooth and nanostructured Ni as well as θ-Al2O3 catalysts
2011
Abstract In the current study, we have performed ab initio DFT calculations on the gradually growing 2D periodic models of capped single-wall carbon nanotubes (SW CNTs) upon their perpendicular junctions with the Ni(111) substrate, in order to understand the peculiarities of the initial stage of their growth on either smooth or nanostructured catalytic particles. Appearance of the adsorbed carbon atoms upon the substrate follows from the dissociation of CVD hydrocarbon molecules, e.g., CH4: (CH4)ads → (CH)ads+3Hads and (CH)ads → Cads+Hads. (Since the effective growth of CNTs upon Ni nanoparticles occur inside the nanopores of amorphous alumina, we have also simulated analogous surface react…
A Territorial-driven approach to capture the transformative momentum of the Social Economy especially from the agricultural cooperatives
2021
In the last few lustrums, the literature has searched for more precise methods to assess the socio-economic importance of the Social and Solidarity Economy (SSE). On that basis, this article offers a new way of assessing the SSE impact, enhancing the understanding of the SSE potential for socio-economic transformation. An evolutionary micro–meso–macro and territorial theoretical framework is developed, utilizing, along with the assistance of a qualitative methodology, studies on the transformation promoted by the SSE on the sugar cane cluster of Veracruz (Mexico). The main results of the article are that the SSE boost beneficiaries, while the protagonists of the transformation c…
Passive sampling in monitoring of nonylphenol ethoxylates and nonylphenol in aquatic environments
2012
The present practices for determining the concentration levels of various pollutants are in many respects insufficient and for this reason, there is an urgent need especially to develop more cost-effective sampling methods. In this study, a novel passive sampling tool (the Chemcatcher®) for monitoring nonylphenol ethoxylates (NPEOs) and nonylphenol (NP) in aqueous media was tested. These environmentally harmful substances have been widely used in different household and industrial applications and they affect aquatic ecosystems, for example, by acting as endocrine disrupting compounds. The highest accumulation of NPEOs and NP in laboratory-scale tests was obtained when using an SDB-XC (stan…
La economía social y solidaria como alternativa económica. Bienes comunes y democracia
2014
El presente artículo trata de enmarcar la economía social y solidaria en el seno del actual debate producto de la crisis económica vigente, haciendo especial hincapié en las cuestiones relacionadas con los bienes comunes y la gestión democrática. La crisis presente ha puesto de manifiesto la necesidad de proponer modelos socio-económicos alternativos que aúnen democracia, compromiso social y sostenibilidad del medio ambiente. La economía social y solidaria, sin ser un programa homogéneo, está contribuyendo a proponer respuestas a algunos de los problemas actuales en materia de desempleo e integración social, revalorizando en los procesos económicos, no sólo los intercambios mercantiles, sin…
Size-confinement of CsH2PO4 in anodic alumina membranes for thin film electrolyte solid acid fuel cell
2007
Going global : ay-liikkeen menestysresepti globaalissa ajassa?
2008
Piranilidena atvasinājumu optiskās un pastiprinātas spontānās emisijas īpašības PVK matricā
2015
Organiskie materiāli ir daudzsološi dažādiem moderniem pielietojumiem, tai skaitā optiski ierosinātiem organiskajiem cietvielu lāzeriem, kuriem vajadzīgi materiāli ar augstu pastiprināšanās koeficientu un zemām ierosmes enerģijām. Vairumā organisko sistēmu šie parametri ir limitēti krāsvielu molekulu kristalizācijas dēļ. Tādēļ savienojumi ar samazinātu kristalizēšanos būtu ļoti noderīgi. Šajā darbā tika pētītas plānās kārtiņas ar jauniem plaši zināmās krāsvielas DCM atvasinājumiem PVK polimēra matricā dažādās koncentrācijās. Kārtiņām tika uzņemti fotoluminiscences spektri un veikti pastiprinātas spontānās emisijas (PSE) mērījumi. Tika novērota spēcīga koncentrācijas ietekme uz emisijas spek…