| 1. |
|
|
| 2. |
|
|
| 3. |
|
|
| 4. |
|
|
| 5. |
- Walker, R. P., et al.
(författare)
-
European project to develop a UV/VUV free-electron laser facility on the ELETTRA storage ring
- 1999
-
Ingår i: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. - 0168-9002. ; 429:1, s. 179-184
-
Tidskriftsartikel (refereegranskat)abstract
- Sincrotrone Trieste, collaborating with various institutions, has recently begun a 3-year project to develop a UV/VUV free-electron laser on the ELETTRA storage ring. The main features and novel technical aspects of the project are described, including the design of the optical cavity and undulator, the electron beam characteristics and a first assessment of the predicted laser performance. Preliminary calculations suggest that the combined effects of a higher quality, higher energy electron beam, together with the use of a helical undulator, should significantly enhance FEL performance levels, as compared to present day values.
|
|
| 6. |
- Clarke, Robert, et al.
(författare)
-
Lowering blood homocysteine with folic acid based supplements : Meta-analysis of randomised trials
- 1998
-
Ingår i: British Medical Journal. - : BMJ. - 0959-8146. ; 316:7135, s. 894-898
-
Forskningsöversikt (refereegranskat)abstract
- Objective: To determine the size of reduction in homocysteine concentrations produced by dietary supplementation with folic acid and with vitamins B-12 or B-6. Design: Meta-analysis of randomised controlled trials that assessed the effects of folic acid based supplements on blood homocysteine concentration. Multivariate regression analysis was used to determine the effects on homocysteine concentrations of different doses of folic acid and of the addition of vitamin B-12 or B-6. Subjects: Individual data on 1114 people included in 12 trials. Findings: The proportional and absolute reductions in blood homocysteine produced by folic acid supplements were greater at higher pretreatment blood homocysteine concentrations (P < 0.001) and at lower pretreatment blood folate concentrations (P < 0.001). After standardisation to pretreatment blood concentrations of homocysteine of 12 μmol/l and of folate of 12 nmol/l (approximate average concentrations for Western populations), dietary folic acid reduced blood homocysteine concentrations by 25% (95% confidence interval 23% to 28%; P < 0.001), with similar effects in the range of 0.5-5 mg folic acid daily. Vitamin B-12 (mean 0.5 mg daily) produced an additional 7% (3% to 10%) reduction in blood homocysteine. Vitamin B-6 (mean 16.5 mg daily) did not have a significant additional effect. Conclusions: Typically in Western populations, daily supplementation with both 0.5-5 mg folic acid and about 0.5 mg vitamin B-12 would be expected to reduce blood homocysteine concentrations by about a quarter to a third (for example, from about 12 μmol/l to 8-9 μmol/l). Large scale randomised trials of such regimens in high risk populations are now needed to determine whether lowering blood homocysteine concentrations reduces the risk of vascular disease.
|
|
| 7. |
- Marques, F. M., et al.
(författare)
-
Neutrons from the breakup of C-19
- 1996
-
Ingår i: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - 0370-2693. ; 381:4, s. 407-412
-
Tidskriftsartikel (refereegranskat)abstract
- Neutrons arising from the breakup of a 30 MeV/nucleon C-19 beam on a tantalum target have been measured using the 98 element array DEMON. A narrow, forward peaked neutron angular distribution, with a corresponding momentum spread considerably smaller than those measured simultaneously for N-21, O-22 and F-24 was observed for charged fragments with Z
|
|
| 8. |
|
|
| 9. |
|
|
