| 1. |
- Ciesla, K, et al.
(författare)
-
DSC studies of gamma irradiation influence on gelatinisation and amylose-lipid complex transition occurring in wheat starch.
- 2003
-
Ingår i: Radiation Physics and Chemistry. - 0969-806X. ; 68:5, s. 933-940
-
Tidskriftsartikel (refereegranskat)abstract
- Differential scanning calorimetry studies are presented dealing with the influence of gamma irradiation (carried out in the solid state) on the structure of amylose–lipid complex in wheat starch. Suspensions of the control and the wheat starch irradiated with a 30 kGy gamma rays (characterised by starch-to-water ratio of 1:1 and ca. 1:4) were examined during several courses of heating and cooling at rates of 2.5 and 10°C min−1. Differences were observed between enthalpy and temperature of gelatinisation and amylose–lipid complex transition as well as retrogradation taking place in the suspensions and gels of the control and the irradiated starch. The influence of the preceding heating and cooling on further transformations of the amylose–lipid complex differs for the control and the irradiated samples.
|
|
| 2. |
- Ciesla, K, et al.
(författare)
-
Influence of gamma radiation on potato starch gelatinization studied by differential scanning calorimetry
- 2002
-
Ingår i: Radiation Physics and Chemistry. - 0969-806X. ; 64:2, s. 137-148
-
Tidskriftsartikel (refereegranskat)abstract
- The paper presents a study of the influence of the conditions applied during differential scanning calorimetry (DSC) Measurements (concentration and heating rate) oil the possible detection of the differences between gelatinization occuring in both non-irradiated and irradiated potato starch with a dose of 20kGy. Differences in gelatinization of irradiated and non-irradiated potato starch during DSC analysis was attributed to the radiation induced destruction of crystalline ordering. This was confirmed by studies of the samples irradiated to very high doses (446 and 600 kGy). and by comparing with the effect of grinding. Changes of starch properties caused by radiodepolymerization-contrary to those caused by grinding influences gelatinization behaviour much more than the WAXS crystallinity in solid state. (C) 2002 Elsevier Science Ltd. All rights reserved.
|
|
| 3. |
- Lundstrom, T., et al.
(författare)
-
The reaction of OH with H at elevated temperatures
- 2002
-
Ingår i: Radiation Physics and Chemistry. - 0969-806X .- 1879-0895. ; 64:1, s. 29-33
-
Tidskriftsartikel (refereegranskat)abstract
- The temperature dependence of the rate constant for the reaction between OH radicals and H atoms has been determined in Ar-saturated solutions at pH 2. The reaction was studied in the temperature range 5-233°C. The rate constants at 20°C and 200°C are 9.3×109 and 3.3×1010dm3mol-1s-1, respectively. The activation energy was found to be 8.2±0.4kJmol-1 (2.0±0.1kcalmol-1). This value is lower than that expected for a diffusion controlled reaction. © 2002 Elsevier Science Ltd. All rights reserved.
|
|
| 4. |
- Lundström, Tim, et al.
(författare)
-
The reaction of hydrogen atoms with hydrogen peroxide as a function of temperature
- 2001
-
Ingår i: Radiation Physics and Chemistry. - 0969-806X .- 1879-0895. ; 61:2, s. 109-113
-
Tidskriftsartikel (refereegranskat)abstract
- The temperature dependence for the reaction of H atoms with H2O2 at pH 1 has been determined using pulse radiolysis technique. The reaction was studied in the temperature range 10-120°C. The rate constant at 25°C was found to be 5.1 ± 0.5 × 107 dm3 mol-1 s-1 and the activation energy was found to be 10.7 ± 0.5 kJ mol-1. © 2001 Published by Elsevier Science Ltd.
|
|
| 5. |
- Schuch, R, et al.
(författare)
-
High resolution studies of electron-ion recombination
- 2003
-
Ingår i: Radiation Physics and Chemistry. - 0969-806X. ; 68:1-2, s. 51-56
-
Tidskriftsartikel (refereegranskat)abstract
- The formation of atoms by recombination of free electrons with ions is a fundamental process and plays a central role in astro-physical and fusion plasmas. It can be seen as time-inverse photo-ionization, auto-ionization, or electron-impact ionization. Here, we show how these processes can be measured with cooler-storage rings, such as CRYRING at MSL, with very high accuracy. The status of theoretical modeling is briefly reviewed and anomalies are uncovered. We discuss some examples of recombination for ions where strong dielectronic recombination resonances occur. With cooler-storage rings, these resonances can today be measured with meV accuracy, and from the spectra of the dielectronic resonances, very accurate values for energy splittings and resonance strengths are derived. These allow crucial tests of relativistic, correlation, and QED effects in these systems.
|
|
| 6. |
|
|
| 7. |
|
|
| 8. |
- Hirade, T, et al.
(författare)
-
The effect of gamma-irradiation on positronium formation in polyethylene
- 2001
-
Ingår i: Radiation Physics and Chemistry. - 0969-806X .- 1879-0895. ; 60:4-5, s. 541-544
-
Tidskriftsartikel (refereegranskat)abstract
- The effect of gamma -irradiation on positronium (Ps) formation, especially the decrement of Ps formation at room temperature, was studied in linear poly(ethylene). We found that chemical changes, such as oxidation, cross-linking, or radicals created by gamma -irradiation of similar to 50 kGy do not affect Ps formation very much. The decrement of Ps formation was probably caused by a temporary change of physical structure by irradiation that disappears by anneals in the temperature range from room temperature to 120 degreesC, gradually. (C) 2001 Elsevier Science Ltd. All rights reserved.
|
|
| 9. |
- Malmqvist, Klas
(författare)
-
Accelerator-based ion beam analysis - an overview and future prospects
- 2004
-
Ingår i: Radiation Physics and Chemistry. - : Elsevier BV. - 0969-806X. ; 71:3-4, s. 817-827
-
Tidskriftsartikel (refereegranskat)abstract
- The use of energetic ion beams for the analysis of materials has been developed throughout the last four decades and has now evolved into a mature and powerful analytical set of tools applicable in great variety of fields. This paper summarises this development with a special emphasis on the use of nuclear microprobes. The main techniques used for ion beam analysis will be described, suitable applications given and some on-going and future development indicated.
|
|
| 10. |
|
|
