Search results for "VET"
showing 10 items of 4076 documents
Pannelli traslucidi preassemblati “a secco” e precompressi realizzati con vetromattoni “modificati”
2011
L’articolo illustra le problematiche connesse al progetto di un pannello preassemblato a secco e precompresso realizzato impiegando vetromattoni “modificati”, energeticamente efficienti. Tra le 21 nuove configurazioni del vetromattone individuate è stata indagata per via analitico-sperimentale quella più efficiente dal punto di vista energetico, al fine di valutarne la resistenza meccanica e conoscere lo stato deformativo che si genera nel giunto adesivo tra conchiglie di vetro e “cintura termica”.Per realizzare un taglio termico tra le due conchiglie di vetro e consentire l’inserimento di una o più lastre all’interno dell’intercapedine del vetromattone è stata, infatti, progettata una “cin…
Studio funzionale di vettori lentivirali ricombinanti, contenenti l'isolatore cromatinico di riccio di mare sns5.
2011
Vettori polimerici della poliaspartammide coniugati a bisfosfonati per il direzionamento di farmaci alle ossa.
2011
Measurement of the H2(p,γ)He3 S factor at 265–1094 keV
2021
Recent astronomical data have provided the primordial deuterium abundance with percent precision. As a result, big bang nucleosynthesis may provide a constraint on the universal baryon to photon ratio that is as precise as, but independent from, analyses of the cosmic microwave background. However, such a constraint requires that the nuclear reaction rates governing the production and destruction of primordial deuterium are sufficiently well known. Here, a new measurement of the 2H(p,γ)3He cross-section is reported. This nuclear reaction dominates the error on the predicted big bang deuterium abundance. A proton beam of 400–1650 keV beam energy was incident on solid titanium deuteride targe…
Thermodynamically driven self-assembly of pyridinearene to hexameric capsules
2019
Pyridinearene macrocycles have previously shown unique host–guest properties in their capsular dimers including endo complexation of neutral molecules and exo complexation of anions. Here, we demonstrate for the first time the formation of hydrogen bonded hexamer of tetraisobutyl-octahydroxypyridinearene in all three states of matter – gas phase, solution and solid-state. Cationic tris(bipyridine)ruthenium(II) template was found to stabilize the hexamer in gas phase, whereas solvent molecules do this in condensed phases. In solution, the capsular hexamer was found to be the thermodynamically favoured self-assembly product and transition from dimer to hexamer occurred in course of time. The …
Role of Weak Hydrogen Bonds and Halogen Bonds in 5-Halo-1,3-dimethyluracils and Their Cocrystals : A Combined Experimental and Computational Study
2016
Seven single crystals containing either N,N-dimethyluracil (DMHU) or one of its 5-halogenated derivatives (DMXU; X = F, Cl, Br, I) were prepared using N,N-dimethylformamide as the crystallization solvent. Single crystal X-ray diffraction and quantum chemical calculations carried out at the spin component scaled local MP2 level of theory were then used to study the intramolecular halogen and nonconventional hydrogen bonds present in the structures. The results were compared to and contrasted with the previously reported data for uracil and its halogenated derivatives. In particular, the intermolecular interactions in DMIU were compared to the halogen and hydrogen bonds in 5-iodouracil that, …
Vetīvers Chrysopogon zizaniodes kā modeļsuga ūdenstilpju fitoremediācijas pētījumiem Latvijas apstākļos
2019
Fitoremediācija ir iedarbīga vides piesārņojuma attīrīšanas tehnoloģija. Darba mērķis bija novērtēt vetīvera Chrysopogon zizanioides izmantošanu ūdenstilpju fitoremediācijas pētījumiem Latvijas apstākļos, salīdzinot tā morfoloģiskos parametrus un uzkrātos elementus dzinumos un saknēs brīvā dabā ūdenstilpēs un siltumnīcas apstākļos augušam vetīveram. C. zizanioides uzrādīja elementu (Fe, Mn, Zn, Cu, Pb, Ni un Cr) uzkrāšanas pazīmes, bet savstarpējas sakarības starp barības šķīdumā un biomasā esošo elementu koncentrāciju nenovēroja. Plostu vetīvers uzrādīja mazāko dzinumu un sakņu sauso masu, tomēr uzkrāto elementu koncentrācija plosta variantiem vairākumā gadījumu bija lielāka. Šīs pazīmes l…
Short-term responses of Rana arvalis tadpoles to pH and predator stress: adaptive divergence in behavioural and physiological plasticity?
2022
Environmental stress is a major driver of ecological and evolutionary processes in nature. To cope with stress, organisms can adjust through phenotypic plasticity and/or adapt through genetic change. Here, we compared short-term behavioural (activity) and physiological (corticosterone levels, CORT) responses of Rana arvalis tadpoles from two divergent populations (acid origin, AOP, versus neutral origin, NOP) to acid and predator stress. Tadpoles were initially reared in benign conditions at pH 7 and then exposed to a combination of two pH (acid versus neutral) and two predator cue (predator cue versus no predator cue) treatments. We assessed behavioural activity within the first 15 min, an…
Virtaaman vaikutus turvetuotantoalueelta lähtevän veden ainepitoisuuksiin ja kuormitukseen
2016
Suurten virtaamien vaikutus turvetuotantoalueilta purkautuvan veden laatuun sekä ainekuormitukseen on herättänyt paljon keskustelua viime vuosina. Ajantasaista tutkimustietoa vesienkäsittelymenetelmien tehosta suurten virtaamien aikana on kuitenkin vähän saatavilla. Virtaaman vaikutusta turvetuotantoalueelta lähtevän veden laatuun, ainekuormitukseen sekä erilaisten vesienkäsittelymenetelmien puhdistustehoon arvioitiin 36 turvetuotantoalueen päästötarkkailutuloksista vuosilta 2008–2013. Tutkielmassa tarkasteltiin neljää keskeistä veden laadun kuvaajaa, fosforia, typpeä, kiintoainetta ja happea kuluttavaa orgaanista ainesta (CODMn). Ennakko-olettamuksena oli, että vedenlaatu ja vesienkäsittel…
Regional Farmers’ Perception and Societal Issues in Vineyards Affected by High Erosion Rates
2021
We explore the current situation in a viticultural region in Eastern Spain from a holistic and multifaceted research approach, which allowed us to understand the biophysical conditions, economic cost, social impact, and perception of the farmers’ community to the use of catch crops. A survey of the perception of the farmers, and an assessment of the biophysical impact of catch crops (CC) and tillage (C = Control plot) on soil organic matter, bulk density, infiltration capacity (single ring infiltrometer), and runoff generation and soil erosion (rainfall simulation experiments) was carried out. Two representative fields as study sites were selected in Les Alcusses valley, within Els Alforins…