Search results for "vety"
showing 5 items of 55 documents
Biometaanin ja -vedyn tuotantopotentiaali Suomessa
2010
Globaali tarve edistää kestävää kehitystä, vähentää ympäristökuormitusta ja hidastaa ilmastonmuutosta edellyttää mm. materiaalivirtojen tehokasta hallintaa ja paluuta uusiutuvien ja kierrätettävien resurssien käyttöön. Biokaasuteknologia tarjoaa yhden ratkaisun, yhdistäen jätteiden käsittelyn ja energian tuotannon. Kiinnostus biokaasuteknologian käyttöön on lisääntynyt viime vuosina myös Suomessa. Suunnitteilla on useita biokaasulaitoksia. Lisäksi useat tahot ovat tehneet selvityksiä biokaasun hyödyntämiseksi. Tämän työn tavoitteena oli selvittää biokaasuprosessin raaka-aineeksi soveltuvien erilaisten biomassojen määrät ja sijainnit Suomessa. Tavoitteena oli myös selvittää näiden jakeiden m…
VUV-diagnostics of low temperature hydrogen plasmas
2015
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, …