Search results for "REE"

Silseskwioksany i ich zastosowanie w syntezie materiałów polimerowych

2015

Artykuł stanowi przegląd literatury dotyczącej syntezy oraz charakterystyki materiałów polimerowych zawierających silseskwioksany (POSS). Przedstawiono metody otrzymywania hybrydowych materiałów polimerowych z udziałem funkcjonalizowanych POSS na drodze click chemistry, polikondensacji, poliaddycji, metatezy z otwarciem pierścienia ipolimeryzacji rodnikowej zarówno konwencjonalnej, jak i kontrolowanej (ATRP).

Prolonged stigma and flower lifespan in females of the gynodioecious plant Geranium sylvaticum

2017

In gynodioecious plants females need a reproductive advantage over hermaphrodites to be maintained in the same population. Generally, three main proximate causes for a female advantage are considered: inbreeding avoidance, different resource allocation patterns, and differences in ecological interactions. A mechanism potentially causing a female advantage that is rarely discussed is a difference in floral longevity between the genders. Females may have a longer stigma lifespan than hermaphrodites, which can affect pollination. Stigma and flower lifespan are rarely documented in gynodioecious species, although it is a common observation in dioecious species that female plants flower longer t…

Evaluation of the impact of a small marina on intertidal assemblages

2009

Polysarcosine-Based Lipids: From Lipopolypeptoid Micelles to Stealth-Like Lipids in Langmuir Blodgett Monolayers.

2016

Amphiphiles and, in particular, PEGylated lipids or alkyl ethers represent an important class of non-ionic surfactants and have become key ingredients for long-circulating (“stealth”) liposomes. While poly-(ethylene glycol) (PEG) can be considered the gold standard for stealth-like materials, it is known to be neither a bio-based nor biodegradable material. In contrast to PEG, polysarcosine (PSar) is based on the endogenous amino acid sarcosine (N-methylated glycine), but has also demonstrated stealth-like properties in vitro, as well as in vivo. In this respect, we report on the synthesis and characterization of polysarcosine based lipids with C14 and C18 hydrocarbon chains and their end g…

The effect of inbreeding rate on fitness, inbreeding depression and heterosis over a range of inbreeding coefficients

2014

Understanding the effects of inbreeding and genetic drift within populations and hybridization between genetically differentiated populations is important for many basic and applied questions in ecology and evolutionary biology. The magnitudes and even the directions of these effects can be influenced by various factors, especially by the current and historical population size (i.e. inbreeding rate). Using Drosophila littoralis as a model species, we studied the effect of inbreeding rate over a range of inbreeding levels on (i) mean fitness of a population (relative to that of an outbred control population), (ii) within‐population inbreeding depression (reduction in fitness of offspring fro…

Preparation of tungstophosphoric acid/cerium-doped NH2-UiO-66 Z-scheme photocatalyst: a new candidate for green photo-oxidation of dibenzothiophene a…

2021

International audience; The goal of this study was to introduce an effective visible-light induced photocatalytic system with a good ability for photocatalytic oxidative desulfurization (PODS) and denitrogenation (PODN) using molecular oxygen (O2) as an oxidant. In this regard, tungestophosphoric acid (PW12) was supported onto cerium-doped NH2-UiO-66 (PW12/Ce-NUiO-66) and employed for the photo-oxidation of dibenzothiophene (DBT) and quinoline (Qu). Herein, using cerium (Ce) as a “mediator” facilitated the separation of charge carriers, while NH2-UiO-66 remarkably enhanced the surface area with plentiful adsorption sites and shifted the adsorption edge of PW12to the visible region. The sum …

On the Porosity of Free Boundaries in Degenerate Variational Inequalities

2000

Abstract In this note we consider a certain degenerate variational problem with constraint identically zero. The exact growth of the solution near the free boundary is established. A consequence of this is that the free boundary is porous and therefore its Hausdorff dimension is less than N and hence it is of Lebesgue measure zero.

An Ethical Investments Evaluation for Portfolio Selection

2004

The Socially Responsible Investing (SRI) is an assets allocation, whose aim is to maximize not only the portfolio expected return but the benefits for a consumer who as a whole operates according to the ethical principles. The wealth of a market economy is to cross the different ethical identities of families, of enterprises, of banks, in order to improve the allocation of the resources for a sustainable development. In this paper, we aim at describing the portfolio selection realized on the basis of the ethical principles - positive /negative, inclusionary/exclusionary - of an investor. The first part of this paper describes Socially Responsible Investing (SRI) and ethical funds market in …

Spatial representations of future in Homeric Greek

2015

The aim of this paper is to investigate the space-time mapping of the future in Homeric Greek. It is widely accepted that the spatial adverbs πρόσσω ‘in front’ and ὀπίσσω ‘behind’ in the Homeric poems are used to portray temporal events located in a sequence of aligned entities that follow one after the other on the same path (Dunkel, 1983, p. 66). In such a temporal sequence, or Time-rp model, those adverbs are associated respectively to past and future events in a bipartite spatial representation of time, without involving a deictic ego-experiencer. After analyzing data from the Homeric poems in a cognitive linguistic perspective, it is found that some temporal uses of the preposition πρό…

Atsaukšana un conteksts karjeras specifiska vārdu krājuma mācīšanai vidusskolas angļu valodas stundās

2022

Mūsdienās pateicoties globalizācijai angļu valoda kļūst aizvien svarīgāka lai spētu pilnībā piedalīties mācību un darba vidē. Šajās vidēs personām vajadzētu zināt ne tikai atbilstošu daudzumu angļu valodas ikdienas saziņai, bet arī izmantot vārdu krājumu, kas ir specifisks dotajai nozarei. Daži no veidiem kā efektīvāk mācīt vārdu krājumu ir atsaukšana un konteksta pavedieni. Diplomdarba mērķis bija izpētīt atsaukšanas un konteksta efektivitāti un karjerai specificēta vārdu krājuma svarīgumu skolēniem. Par pētījuma metodi tika izvēlēts atsevišķa gadījuma pētījums, kura laikā tika veikti praktiski uzdevumi un tika secināts, ka lai gan atsaukšana un konteksta pavedieni var būt efektīvas metode…