| 1. |
- Koptioug, Andrei, 1956-, et al.
(författare)
-
Effect of External Magnetic Fields and Resonance Radio frequency Radiation on Radical Reactions
- 1990
-
Ingår i: Physica. B, Condensed matter. - : Esevier. - 0921-4526 .- 1873-2135. ; 164:1-2, s. 200-204
-
Tidskriftsartikel (refereegranskat)abstract
- It is well known that an external magnetic field can affect the rate of singlet-triplet transitions in a radical pair and hence its recombination probability in liquid. Resonance radiofrequency (RF) radiation induces quantum beats in the kinetics of radical pair recombination. At high RF field amplitudes the singlet-triplet transitions in radical pairs can be efficiently suppressed.
|
|
| 2. |
- Bokhorst, Stef, et al.
(författare)
-
Changing Arctic snow cover : A review of recent developments and assessment of future needs for observations, modelling, and impacts
- 2016
-
Ingår i: Ambio. - : Springer Science and Business Media LLC. - 0044-7447 .- 1654-7209. ; 45:5, s. 516-537
-
Forskningsöversikt (refereegranskat)abstract
- Snow is a critically important and rapidly changing feature of the Arctic. However, snow-cover and snowpack conditions change through time pose challenges for measuring and prediction of snow. Plausible scenarios of how Arctic snow cover will respond to changing Arctic climate are important for impact assessments and adaptation strategies. Although much progress has been made in understanding and predicting snow-cover changes and their multiple consequences, many uncertainties remain. In this paper, we review advances in snow monitoring and modelling, and the impact of snow changes on ecosystems and society in Arctic regions. Interdisciplinary activities are required to resolve the current limitations on measuring and modelling snow characteristics through the cold season and at different spatial scales to assure human well-being, economic stability, and improve the ability to predict manage and adapt to natural hazards in the Arctic region.
|
|
| 3. |
- Field, Christopher B., et al.
(författare)
-
Summary for Policymakers
- 2014
-
Ingår i: Climate Change 2014: Impacts, Adaptation, and Vulnerability. Part A: Global and SectoralAspects.. - 9781107415379 ; , s. 1-32
-
Bokkapitel (refereegranskat)
|
|
| 4. |
- Gorkina, Alexandra L, et al.
(författare)
-
Transparent and conductive hybrid graphene/carbon nanotube films
- 2016
-
Ingår i: Carbon. - : Elsevier. - 0008-6223 .- 1873-3891. ; 100, s. 501-507
-
Tidskriftsartikel (refereegranskat)abstract
- Carbon nanomaterials (carbon nanotubes (CNTs) and graphene) are promising materials for optoelectronic applications, including flexible transparent and conductive films (TCFs) due to their extraordinary electrical, optical and mechanical properties. However, the performance of CNT- or graphene-only TCFs still needs to be improved. One way to enhance the optoelectrical properties of TCFs is to hybridize CNTs and graphene. This approach leads to creation of a novel material that exhibits better properties than its individual constituents. In this work, the novel hybrid CNT-graphene nanomaterial was fabricated by graphene oxide deposition on top of CNT films. The graphene oxide was then reduced by thermal annealing at ambient atmosphere or in H2 atmosphere. At the final step the CNT-graphene hybrids were chemically doped using gold(III) chloride. As a result, we show that the hybrids demonstrate excellent optoelectrical performance with the sheet resistance as low as 73 Ω/□ at 90% transmittance.
|
|
| 5. |
- Koptioug, Andrei, 1956-, et al.
(författare)
-
Quantum beats in singlet-triplet transitions of radical pairs induced by a radio-frequency field
- 1990
-
Ingår i: Chemical Physics Letters. - Amsterdam : Elsevier Science. - 0009-2614 .- 1873-4448. ; 165:2-3, s. 142-145
-
Tidskriftsartikel (refereegranskat)abstract
- This Letter reports on the experimental observation of quantum beats stimulated by a resonance radio-frequency field in the recombination luminescence of radical-ion pairs. The beat frequency for solutions of p-terphenyl in squalane increases linearly with rf-field amplitude in the range 1 to 10 G in a rotating frame. The beat frequency corresponds to the theoretically calculated one, with amplitude twice as low as the theoretical one. This is attributed to contributions from the recombination of spin-uncorrelated radical-ion pairs
|
|
| 6. |
- Koptyug, Andrey, 1956-, et al.
(författare)
-
Spin-locking in concentration-narrowed OD ESR spectra
- 1989
-
Ingår i: Chemical Physics. - Amsterdam : Elsevier. - 0301-0104 .- 1873-4421. ; 138:1, s. 173-178
-
Tidskriftsartikel (refereegranskat)abstract
- The effect of spin- locking under the action of a resonance rf field of large amplitude has been observed in the optically detected ESR spectra (OD ESR) of radical-ion pairs both in strong and weak magnetic fields. "Hampering" of singlet-tgriplet transitions occurs for concentrations of aromatic acceptors in non polar solutions at room temperature from 10e-4 to 1 M. It is proposed that in spite of strong concentration narrowing OD ESR signals are inhomogeneously broadened. This can be due to neutral molecule- radical-anion aggregate formation.
|
|
