| 1. |
|
|
| 2. |
- Blanco, A, et al.
(författare)
-
Progress in timing Resistive Plate Chambers
- 2004
-
Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - 0168-9002 .- 1872-9576. ; 535:1-2, s. 272-276
-
Tidskriftsartikel (refereegranskat)abstract
- Timing RPCs are Resistive Plate Chambers made with glass and metal electrodes separated by precision spacers. Typical gas gaps are a few hundred micrometers wide. Such counters were introduced in 1999 and have since reached timing accuracies below 50 ps sigma with efficiencies above 99% for MIPs. Applications in high-energy physics have already taken place with several more under study. Some recent developments include the extension of the counting rate capability by over one order of magnitude, to 25 kHz/cm(2), with time resolutions below 100 ps sigma. A prototype RPC-based Positron Emission Tomograph yielded a reconstructed point-source resolution of 0.6 mm FWHM and a modified timing RPC design, featuring 50 mum pitch anode strips, allowed to reach extremely good position resolution for hard X-rays in digital readout mode. An analytically solvable model has allowed us to clarify the basic factors influencing the time resolution.
|
|
| 3. |
|
|
| 4. |
- Helstrom, L, et al.
(författare)
-
Abortion rate and contraceptive practices in immigrant and native women in Sweden
- 2003
-
Ingår i: Scandinavian journal of public health. - : SAGE Publications. - 1403-4948 .- 1651-1905. ; 31:6, s. 405-410
-
Tidskriftsartikel (refereegranskat)abstract
- Aim: The aim of this study was to analyse whether immigrant women request induced abortion more frequently than Swedish-born women and, if so, to study possible explanations, including contraceptive practices and attitudes. Methods: All women who requested induced abortion during a period of one year were included in the study. The 1,289 women, of whom 36% were born outside Sweden, were interviewed by a nurse-midwife who, using a structured protocol, gathered information on socioeconomic factors, reasons for abortion, experience of contraceptive methods, and family planning counselling. The proportion of women with non-Swedish origin in the study population was compared with the official demographic statistics of the corresponding area. Results: The number of women born outside Sweden who requested induced abortion was larger than expected from their proportion in the population. The immigrant women originated from 77 countries and four continents, the largest subgroup, 11%, coming from Iran. Immigrant women had less experience of contraceptive use, more previous pregnancies and more induced abortions than women born in Sweden. In a multivariate analysis, immigrant status and educational level were found to be independent risk factors for repeat abortion. Conclusion: Immigrant status seems to be an independent risk factor for induced abortion. The immigrant women originated from a wide range of cultures. There is no reason to believe that the women in this heterogeneous group should have any cultural factor in common that could explain their higher proneness to seek induced abortion. The most probable cause is that immigrant status is associated more often with low education, weak social network, poverty, unemployment, and being outside common pathways to healthcare.
|
|
| 5. |
|
|
