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- Aamodt, K., et al.
(författare)
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The ALICE experiment at the CERN LHC
- 2008
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Ingår i: Journal of Instrumentation. - 1748-0221. ; 3:S08002
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Forskningsöversikt (refereegranskat)abstract
- ALICE (A Large Ion Collider Experiment) is a general-purpose, heavy-ion detector at the CERN LHC which focuses on QCD, the strong-interaction sector of the Standard Model. It is designed to address the physics of strongly interacting matter and the quark-gluon plasma at extreme values of energy density and temperature in nucleus-nucleus collisions. Besides running with Pb ions, the physics programme includes collisions with lighter ions, lower energy running and dedicated proton-nucleus runs. ALICE will also take data with proton beams at the top LHC energy to collect reference data for the heavy-ion programme and to address several QCD topics for which ALICE is complementary to the other LHC detectors. The ALICE detector has been built by a collaboration including currently over 1000 physicists and engineers from 105 Institutes in 30 countries, Its overall dimensions are 16 x 16 x 26 m(3) with a total weight of approximately 10 000 t. The experiment consists of 18 different detector systems each with its own specific technology choice and design constraints, driven both by the physics requirements and the experimental conditions expected at LHC. The most stringent design constraint is to cope with the extreme particle multiplicity anticipated in central Pb-Pb collisions. The different subsystems were optimized to provide high-momentum resolution as well as excellent Particle Identification (PID) over a broad range in momentum, up to the highest multiplicities predicted for LHC. This will allow for comprehensive studies of hadrons, electrons, muons, and photons produced in the collision of heavy nuclei. Most detector systems are scheduled to be installed and ready for data taking by mid-2008 when the LHC is scheduled to start operation, with the exception of parts of the Photon Spectrometer (PHOS), Transition Radiation Detector (TRD) and Electro Magnetic Calorimeter (EMCal). These detectors will be completed for the high-luminosity ion run expected in 2010. This paper describes in detail the detector components as installed for the first data taking in the summer of 2008.
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| 3. |
- Dahlblom, Kjerstin, et al.
(författare)
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Home alone : children as caretakers in León, Nicaragua
- 2009
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Ingår i: Children and society. - : Wiley. - 0951-0605 .- 1099-0860. ; 23:1, s. 43-56
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Tidskriftsartikel (refereegranskat)abstract
- This article seeks to explore and understand the life situations of sibling caretakers in poor areas in León, Nicaragua. The every day lives for caretakers were studied through observations and interviews with children, informants and parents. The children themselves were satisfied and proud to be trusted as caretakers and felt useful in contributing to their families' livelihood. However, in a life course perspective the caretaking role implies a narrowing of life options. Early on they seem to acquire essential life skills but as they grow older many are at risk of falling behind due to their marginalised situation and lack of basic education.
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| 5. |
- Herrera Rodríguez, Andrés, 1966-
(författare)
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Heaven can wait : studies on suicidal behaviour among young people in Nicaragua
- 2006
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In developed countries, suicidal behaviour is recognised as a significant public health problem among young people, but there are few studies from developing countries on this subject. The present thesis aims at estimating the extent of the problem and at exploring factors related to suicidal behaviour among young people in a developing country, Nicaragua, using a combined quantitative and qualitative approach. Three studies were conducted between 1999 and 2006. In the first study, all hospital admitted suicide attempt cases in the area of León were assessed over a three year period. Secondly, a qualitative study using individual in-depth interviews was conducted with eight girls aged between 12 and 19 admitted to hospital after attempting suicide. Thirdly, a study using the Attitudes Towards Suicides (ATTS) questionnaire was conducted in a community based sample of 278 young people aged 15-24 years to assess own suicidal behaviours, attitudes towards suicide as well as exposure to suicidal behaviour among significant others. The hospital surveillance showed that suicide attempt rates were highest among females in the age group 15-19 years with a female rate three times that of males (302.9 versus 98.9 per 100,000 inhabits per year). Drug intoxication and pesticides were the most commonly used methods for the attempts. A consistent seasonal variation with peaks in May-June and September-October was found in each of the three years, possibly related to exam periods in schools. Findings in the qualitative approach led to a tentative model for pathways to suicidal behaviour based on four main categories: Structuring conditions, triggering events, emotions and action taken. Dysfunctional families, lack of confidential and trustworthy contacts and interpersonal conflicts followed by emotions of shame and anger were some important components in the model. The community studies showed that suicidal expressions (life-weariness, death wishes, suicidal ideation, suicide plans and suicide attempts) were common among young people where more than 44.8% of males and 47.4% of females reported some kind of suicidal expression. Gender differences were small. Exposure to suicidal behaviour among others was associated with higher levels of self-reported suicidal behaviour. The attitude study showed that boys had less pro-preventive attitudes than girls, possibly indicating their higher risk for completed suicide. Exposure to suicidal behaviour and own suicidal behaviour showed an association with specific patterns of attitudes. The findings should be taken into consideration when planning for prevention of suicidal behaviour among young people in a developing country like Nicaragua.
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| 6. |
- Herrera Rodríguez, Andrés, et al.
(författare)
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Pathways to suicidal behaviour among adolescent girls in Nicaragua
- 2006
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Ingår i: Social Science and Medicine. - : Elsevier BV. - 0277-9536 .- 1873-5347. ; 62:4, s. 805-814
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Tidskriftsartikel (refereegranskat)abstract
- Adolescent girls are the most frequent suicide attempters worldwide. However, there is little knowledge about pathways leading to suicidal behaviour among young people, in particular in low-income countries. This study explores the motives and processes related to suicidal behaviour among young girls in Nicaragua. Individual in-depth interviews were conducted with eight girls aged between 12 and 19 admitted to hospital after attempting suicide. The audio-taped interviews lasted 2–4 h and were transcribed, translated into English and coded for content. Grounded theory and content analysis were used to construct a theory of the mechanisms behind their suicidal behaviour. A tentative model exploring pathways to suicidal behaviour is described with four main categories: structuring conditions, triggering events, emotions and actions taken. The model illustrates the dialectic interplay between structure and actions taken. Actions taken were categorized as problem solving or various forms of escape where failure with either of these strategies resulted in a suicide attempt. Dysfunctional families, absent fathers and lack of integration into society were some of the structuring conditions that lead to emotional distress. Abuse, deaths in the family, break-up with boyfriends or suicide among friends acted as triggering events. A striking finding was the obvious narrative competence of the girls. Our findings indicate that suicide prevention programmes for young people must offer support from professionals, independent of their family and social networks. Institutions in the community in contact with young people with suicidal behaviour must develop communicative skills to offer a trusting environment mobilising the resources that young people have.
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