Search results for "Additive"
showing 10 items of 297 documents
Boosting Long-Term Stability of Pure Formamidinium Perovskite Solar Cells by Ambient Air Additive Assisted Fabrication
2021
Due to the high industrial interest for perovskite-based photovoltaic devices, there is an urgent need to fabricate them under ambient atmosphere, not limited to low relative humidity (RH) conditions. The formamidinium lead iodide (FAPI) perovskite α-black phase is not stable at room temperature and is challenging to stabilize in an ambient environment. In this work, we show that pure FAPI perovskite solar cells (PSCs) have a dramatic increase of device long-term stability when prepared under ambient air compared to FAPI PSCs made under nitrogen, both fabricated with N-methylpyrrolidone (NMP). The T80 parameter, the time in which the efficiency drops to 80% of the initial value, increases f…
Hedysarum coronarium-Based Green Composites Prepared by Compression Molding and Fused Deposition Modeling
2022
In this work, an innovative green composite was produced by adding Hedysarum coronarium (HC) flour to a starch-based biodegradable polymer (Mater-Bi®, MB). The flour was obtained by grinding together stems, leaves and flowers and subsequently sieving it, selecting a fraction from 75 μm to 300 μm. Four formulations have been produced by compression molding (CM) and fused deposition modeling (FDM) by adding 5%, 10%, 15% and 20% of HC to MB. The influence of filler content on the processability was tested, and rheological, morphological and mechanical properties of composites were also assessed. Through CM, it was possible to obtain easily homogeneous samples with all filler amounts.…
Performance analysis of binary DPSK modulation schemes over Hoyt fading channels
2009
This paper presents a performance analysis of differential phase shift keying (DPSK) modulation schemes over Hoyt fading channels. Based upon the theory of DPSK modulation and a recently derived formula for the probability density function (PDF) of the differential phase between two Hoyt vectors contaminated by additive white Gaussian noise (AWGN), the bit error probability (BEP) for DPSK systems with noncoherent demodulation over Hoyt channels is analyzed. In the analysis, the correlation between adjacent bits is taken into account. The obtained theoretical results are fully validated first by reducing them to the corresponding known solutions for the Rayleigh fading distribution being a s…
Consequences of linking charged and uncharged monomers to binary copolymers studied in dilute solution. Part II: Non-additivity effects in the viscom…
2017
Abstract Copolymers of ethylene oxide (EO) and N,N-dimethyl aminoethyl methacrylate (R) or [2-(methacryloyloxy)ethyl] trimethylammonium iodide (R+) were studied in dilute solution: P ( EO p – b – R n ) ( I ) , P(Rn(1−f) – ran – R+n f) ( II ) , and P ( EO p – b – R n + ) ( III ) ; n and p give the numbers of monomers and f is the degree of charging. For II (variable f) and III (variable n) the effects of charging on the intrinsic viscosities [η] are well described by Boltzmann sigmoids. The deviation of [ η ] from [ η ] add (calculated from the corresponding homopolymer data, assuming additivity of the individual contributions) are quantified by σ = [ η ] / [ η ] add - 1 measuring the segreg…
Thermo- and photo-oxidative stability and improved processability of polyamide stabilized with a new functional additive
2005
During processing polyamides can undergo thermo-mechanical degradation due to the mechanical stress and to the high temperature applied to the melt. Degradation can occur also during the polyamides lifetime due to many driving forces, like temperature, ultraviolet radiations, etc. The mechanisms of degradation are not well understood and the stabilization with usual stabilizers, like phenol antioxidants, is not so efficient as for other classes of polymers. The aim of this work is the study of the effects of the addition of a new multifunctional additive on the processing and on the thermo- and photo-stabilization of polyamide-6. This additive is able to prevent the thermo-mechanical degrad…
Influence of alginate emulsion-based films structure on its barrier properties and on the protection of microencapsulated aroma compound
2009
In recent years the use of natural polymers coming from renewable sources has greatly increased due to the over-solid packaging waste and dwindling petroleum reserves. Biopolymer films, which contain both lipid and polysaccharide ingredients to form complex packaging enable us to obtain edible films with good mechanical and water barrier properties as emulsified alginate edible films. Moreover, these can be considered to encapsulate active molecules as flavours. The aim of this work is to better understand the influence of the composition and the structure of the film matrix on its barrier properties and thus on its capacity to protect encapsulated active substances. Granulometry, Different…
La linguistica vista dalle Alpi. Teoria, lessicografia e multilinguismo
2019
Il volume raccoglie contributi che hanno come principale tema di ricerca la multiforme realtà linguistica dell’ambiente alpino. Essi indagano fenomeni linguistici di lingue standard e di minoranza appartenenti ai gruppi romanzo e germanico. Il libro si compone di quatto sezioni: modelli teorici, valenza e lessicografia, linguistica delle varietà e multilinguismo e le lingue nel Trentino-Alto Adige. The contributions of this book deal with the diverse linguistic situation of the Alps by focusing on phenomena of standard and minority languages which belong to the Romance and Germanic group. They address four main topics which correspond to the four sections of the book: linguistic theory, val…
Production, oxidation traits and health of dairy ewes fed diets supplemented with fungus myceliated grains.
2019
Mushrooms contain many bioactive compounds, mainly poly- and oligosaccharides, known to have benefits for human health. Polysaccharides from mushrooms exhibited immunomodulatory, antibacterial, antiviral, and antifungal properties, as well as antitumor activity. Furthermore, some mushrooms showed to have potent antioxidant properties due to the presence of phenolic acids, flavonoids, polysaccharides, carotenoids, ascorbic acid, and tocopherols. These beneficial properties of mushrooms bioactive compounds indicate their potential use as performance-enhancing natural feed additives for livestock animals. In this regard, the use of mushrooms and mushroom-derived products has largely been inves…
The expression of additivity in the Alps: German auch, Italian anche and their counterparts in Gardenese Ladin
2019
Additive particles (e.g. English also) usually operate on a constituent (‘domain of association’) signaling that it has to be added to a list of items already introduced in the context or inferable. In addition, they can also exhibit a more grammatical function acting as a focused constituent itself or a modal particle. In the present contribution, we aim to provide a classification of the usage patterns and main grammatical functions of the additive item also in the standard languages spoken in the alpine region of Trentino-South Tyrol, i.e. German (auch) and Italian (anche) and in a regional language, Gardenese Ladin (belonging to the Rhaeto-romance group), which displays two forms: nce a…
Analiza etykiet produktów żywnościowych dostępnych w obrocie handlowym w Polsce pod kątem obecności barwników
2016
Barwniki spożywcze są nieodzownym elementem produkcji. Ich zawartość w artykułach żywnościowych jest ściśle limitowana obostrzeniami prawnymi. Ograniczenia zawartości poszczególnych barwników lub nawet zakaz ich stosowania w niekutych krajach związany jest z potencjalnym zagrożeniem dla zdrowia konsumenta. Celem przeprowadzonych badań była ocena występowania barwników w różnych kategoriach produktów spożywczych dostępnych w obrocie handlowym na terenie Opolszczyzny, w oparciu o składy podane na opakowaniach. Materiał badawczy stanowiło 197 produktów spożywczych różnych marek przyporządkowanych do 8 kategorii. Analizę składu artykułów spożywczych dokonano w oparciu o informacje zawarte przez…