| 1. |
- Eriksson, Mikael, et al.
(författare)
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STATUS OF THE MAX IV LIGHT SOURCE PROJECT
- 2006
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Ingår i: European Particle Accelerator Conference 2006, Edinburgh, UK.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 2. |
- Hörnqvist, Magnus, et al.
(författare)
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En öppen stad, en ej befästad
- 2005
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Ingår i: Fronesis. - 1404-2614. ; :18, s. 8-19
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Vår tid är urbanitetens epok. Människor vill komma till staden. Utflyttningen från landsbygd till stad tycks vara en social omvandlingsprocess utan ände. I dagens Sverige bor 84 procent av befolkningen i städer. På tvåhundra år har förhållandet mellan stad och landsbygd nästan vänts i sin motsats. Någon gång under 1930-talets början passerade antalet stadsboende landsbygdens befolkning. Det som hände i Sverige för 70 år sedan händer i dag på global nivå. Under 2005 beräknas antalet människor som bor i en stad någonstans i världen passera det antal som bor på landsbygden. Och det är inte i Nord som den största tillväxten av stadsbefolkningar sker, utan i Syd. Bilden av Syd som det rurala, jordbrukshushållande och efterblivna – i kontrast till bilden av Nord som det urbana, industriella och i utveckling stadda – känns allt mer förfelad. Det är i Syd som de verkligt stora städerna formligen exploderar fram. Men denna omkastning innebär inte en utvecklingsväg som följer det sätt på vilket storstäder i Nord växte fram. Det paradoxala för storstäderna i Syd är att det inte alltid är industrialiseringen som driver fram urbaniseringen. Stor- eller megastäderna i Syd närs av en bräcklig informell sektor. Denna utveckling av en "informaliserad" sektor på arbetsmarknaden – med lågbetalda och osäkra tjänstearbeten – är inte något som enbart sker i Syd. Det som tycks karaktärisera västvärldens metropoler är just framväxten av denna typ av arbeten, samtidigt som industrijobben är på tillbakagång. Samtidigt blir storstäderna allt viktigare för de globala ekonomiska flödena – och självmedvetenheten om detta faktum hos städernas makthavare växer i samma utsträckning. Städer konkurrerar med andra städer om att attrahera kapital och arbetskraft. Staden blir ett varumärke som ska säljas in på städernas marknad, med hjälp av stadsmiljöer som passar en framväxande kreativ klass.
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| 3. |
- Wallén, Erik, et al.
(författare)
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Status of the MAX IV light source project
- 2007
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Ingår i: 9th International Conference on Synchrotron Radiation Instrumentation (SRI 2006). - 9780735403734 ; 879, s. 34-37
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Konferensbidrag (refereegranskat)abstract
- The MAX IV light source project is presented. The MAX IV light source will consist of three low emittance storage rings and a 3 GeV injector linac. The three storage rings will be operated at 700 MeV, 1.5 GeV, and 3.0 GeV, which make it possible to cover a large spectral range from IR to hard X-rays with high brilliance undulator radiation from insertion devices optimised for each storage ring. The preparation of the injector linac to serve as a short pulse source and the major sub-systems of the facility are also presented.
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| 4. |
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| 5. |
- Boman, Magnus, et al.
(författare)
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Human Grid : En förstudie
- 2007. - 2
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Vi har granskat förutsättningarna och möjligheterna att implementera Human Grid: en så kallad mellanprogramvara för att integrera samarbetsfrämjande IT-lösningar som redan idag finns i datorer och telefoner, med hänsyn tagen till formella och informella sociala nätverk.
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| 6. |
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Borgerlighet
- 2007
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Ingår i: Fronesis. - 1404-2614. ; :24
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Annan publikation (refereegranskat)abstract
- Lyxkonsumtion, Stureplansbrats, medelklass och överklass diskuteras allt mer. Samtidigt har den partipolitiska borgerligheten tagit över regeringsmakten. Men vad innebär det att tala om borgerlighet i dagens Sverige? Vilka tillhör denna sociala kategori och vad utmärker den? I Fronesis nr 24 dissekeras gårdagens såväl som dagens borgerlighet.
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| 7. |
- Briscoe, W. J., et al.
(författare)
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Nuclear physics program at MAX-lab
- 2009
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Ingår i: Chinese Physics C. - : IOP Publishing. - 0899-9996 .- 1674-1137. ; 33:12, s. 1159-1166
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Konferensbidrag (refereegranskat)abstract
- The upgrade of the MAX-lab Injector and the construction of MAX III, provided the opportunity for upgrading the tagged-photon facility and thus lead to the possibility of more extensive program in nuclear physics research This upgrade increased the injected electron energy to all eventual maximum of 250 MeV and allows for the extraction of electrons from the MAX I ring operated in the stretcher mode The first stretched bean was delivered in September 2005. The tagged-photon facility was commissioned in parallel with the commissioning of new experimental equipment. The PAC approved experimental program is current in progress, including measurement of pion photoproduction below the Delta(1232) The efforts at the tagged photon-facility are pursed within all international collaboration with around fifty members
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| 8. |
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| 9. |
- Dencker, Magnus, et al.
(författare)
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Bileaflet blood cysts on the mitral valve in an adult.
- 2009
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Ingår i: Journal of the American Society of Echocardiography. - : Elsevier BV. - 1097-6795 .- 0894-7317. ; 22:9, s. 5-1085
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Tidskriftsartikel (refereegranskat)abstract
- Blood cysts within the heart are very rare entities in adults. The authors present possibly the first ever case in which blood cysts were found on both mitral valve leaflets. A 65-year-old woman was referred for transthoracic echocardiography because of vague chest discomfort. Transthoracic echocardiography displayed echo-free cysts on the tips of both mitral valve leaflets. Subsequent transesophageal echocardiography confirmed this finding. The blood cysts were successfully surgically removed.
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| 10. |
- Farzaneh, Farokh, et al.
(författare)
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von Langenbeck procedures at 14 months or Wardill at 18 months for primary repair of cleft palate in adult Swedish patients with bilateral complete cleft lip and palate: A study of facial growth.
- 2009
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Ingår i: Scandinavian journal of plastic and reconstructive surgery and hand surgery / Nordisk plastikkirurgisk forening [and] Nordisk klubb for handkirurgi. - : Informa UK Limited. - 1651-2073 .- 0284-4311. ; 43:4, s. 214-24
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Tidskriftsartikel (refereegranskat)abstract
- We compared facial growth in patients with bilateral complete cleft lip and palate (BCLP) in whom the palate had been repaired by the von Langenbeck procedure at the age of 14 months (L-14), or by the Wardill procedure at 18 months (W-18). A total of 151 unaffected subjects were used as a reference group. Thirty-six adult patients, 26 in the L-14 group, and 10 in the W-18 group, were investigated clinically and with lateral skull radiography, and they also filled out a questionnaire about their dental condition. Multiple linear regression was used to analyse the effect of surgical strategy, sex, and the presence of a velopharyngeal flap on several dependent variables indicating sagittal and vertical jaw relations, and inclination of incisors. The BCLP group was characterised by a pre-normal basal relation (ss-n-sm), retroclined upper (ILs/NL) and lower (ILi/ML) incisors, maxillary retrognathism (s-n-ss) in men, larger maxillary plane angle (NSL/NL) in women, larger mandibular plane (NSL/ML) and intermaxillary vertical relation (NL/ML) in men, and smaller anterior facial height (n-gn) and upper anterior facial height (n-sp). In the BCLP group, differences in outcomes could be explained only by sex. The sagittal jaw base relation (ss-n-sm) was significantly smaller in men than in women, whereas the total anterior facial height (n-gn) was greater in men. Lateral crossbite was found in about 75% of patients. About 70% were satisfied with their dental condition. The choice of surgical strategy had no significant influence on the variables measured on facial morphology.
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| 11. |
- Farzaneh, Farokh, et al.
(författare)
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von Langenbeck procedures at 8 months or Wardill at 18 months for primary repair of cleft palate in adult Swedish patients with unilateral complete cleft lip and palate: A study of facial growth.
- 2008
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Ingår i: Scandinavian Journal of Plastic and Reconstructive Surgery and Hand Surgery. - : Informa UK Limited. - 1651-2073 .- 0284-4311. ; 42:2, s. 67-76
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of this study was to compare facial growth in patients with unilateral complete cleft lip and palate (UCLP) in whom the palate was repaired with the von Langenbeck procedure at 8 months (L-8), or the Wardill procedure at 18 months (W-18). A total of 151 unaffected subjects were used as a reference series. Sixty-one adult patients, 34 in the L-8 group and 27 in the W-18 group, were investigated clinically and with lateral skull radiography and also filled out a questionnaire about their dental condition. Multiple linear regression was used to analyse the effects of the surgical strategy, sex, and the presence of a velopharyngeal flap on several dependent variables indicating sagittal jaw relations, vertical jaw relations, and inclination of incisors. The UCLP group was characterised by a short (n-sp) and retrusive maxilla (s-n-ss) and a retrusive mandible for women (s-n-sm), larger maxillary inclination (NSL/NL), more retroclined lower incisors (IL(I)/ML), shorter upper facial heights (n-sp) and normal total face height (n-gn) than the reference group. In the UCLP group there were significant differences between men and women in mandibular prognathism (s-n-sm), maxillary/mandibular relations (ss-n-sm), maxillary inclination (NSL/NL), total anterior facial height (n-gn), and upper anterior facial height (n-sp). Lateral crossbite was found in 20% of the UCLP group. The prevalence was similar in the L-8 and W-18 groups. Almost 80% of the patients in the UCLP group considered that their dental condition was good. The choice of surgical strategy had no significant influence on the variables measured on facial morphology.
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| 12. |
- Fissum, Kevin, et al.
(författare)
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The Coherent Bremsstrahlung Beam at MAX-lab Facility
- 2008
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Ingår i: Charged and Neutral Particles Channeling Phenomena Channeling 2008 : Proceedings of the 51st Workshop of the INFN ELOISATRON Project - Proceedings of the 51st Workshop of the INFN ELOISATRON Project. - : WORLD SCIENTIFIC. ; , s. 49-61
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Konferensbidrag (refereegranskat)abstract
- The linearly polarized photon beam for photonuclear researches has been produced at MAX-lab facility on the base of coherent bremsstrahlung process of electrons in a diamond crystal. Test experiments have been performed at electron energies 143.9 and 192.7 MeV with a diamond crystal 0.1 mm thick. The measured coherent bremsstrahlung spectra demonstrate typical features to be observed at higher electron energies. The polarization ~35% was obtained at coherent peak energy of ~60 MeV. The experiments have shown that produced polarized photon beam can be used for photonuclear investigations at energy range up to 60 MeV. To extend the energy range it is necessary to increase maximal energy of the electron beam up to 250 MeV.
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| 13. |
- Ganenko, V., et al.
(författare)
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Production of linearly polarized photon beam at MAX-lab
- 2009
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Ingår i: Voprosy Atomnoj Nauki i Techniki. - 1562-6016. ; :3, s. 95-102
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Tidskriftsartikel (refereegranskat)abstract
- Spectra of coherent bremsstrahlung from the diamond crystal in the laboratory MAX-lab on the accelerator MAX-I are measured at the energy of the electronic beam 144 MeV. First in the laboratory MAX-lab a source of the polarized photon radiation was created. Photon spectra were compared with theoretical calculations, that allow to estimate a magnitude of photon polarization, which is sufficient, for performing the nuclear experiments in the intermediate energy range.
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| 14. |
- Golubev, Pavel, et al.
(författare)
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Pion Emission in H-2,C-12,Al-27(gamma,pi+) Reactions at Threshold
- 2008
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Ingår i: Nuclear Physics, Section A. - : Elsevier BV. - 0375-9474 .- 1873-1554. ; 806:1-4, s. 216-229
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Tidskriftsartikel (refereegranskat)abstract
- The very first data from MAX-lab in Lund, Sweden on pion photoproduction at threshold energies are presented. The decrease of the total π+ yield in γ+12C, 27Al reactions below 200 MeV as well as the dσ/dΩ cross-section data essentially follow the predictions of an intranuclear-cascade model with an attractive potential for the pion–nucleus interaction. However, View the MathML source, cross-section data at 176 MeV show deviations which call for refinements of the model and possibly also for the inclusion of coherent pion-production mechanisms.
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| 15. |
- Hansen, Niklas, et al.
(författare)
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Predicting burnout from demands and resources : A comparison between private and public hospitals
- 2007
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Ingår i: XIIIth European Congress of Work and Organizational Psychology.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Burnout among health-care employees is an issue that has received considerable research attention, and numerous studies have found burnout to be predicted by various work-related demands and resources. However, despite the fact that health-care systems in many countries include public as well as private hospitals, our knowledge is limited when it concerns differences in the burnout process between health-care staff in hospitals with different ownership. Data from nurses at three Swedish acute care hospitals – a privatized for-profit, a publicly owned non-profit stock company, and a traditional public administration unit – were used to test (a) if burnout levels differed between hospitals with different ownership and (b) if demands and resources were differently related to nurses’ burnout in the three hospitals. Preliminary results indicate that the burnout level in the public hospital was lower compared to the private and the public companies. Certain demands, such as workload and role conflict, were consistently associated with burnout across hospitals. There were also important differences between private and public hospitals. While the results have immediate implications for hospital managements and efforts to improve employee work environment, they may also provide important insights for political decisions concerning the advantages and disadvantages of public and private ownership of acute care hospitals.
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| 16. |
- Hansen, Niklas, et al.
(författare)
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Predicting nurse burnout from demands and resources in three acute care hospitals under different forms of ownership : A cross-sectional questionnaire survey.
- 2009
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Ingår i: International Journal of Nursing Studies. - : Elsevier BV. - 0020-7489. ; 46:1, s. 95-106
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Tidskriftsartikel (refereegranskat)abstract
- Background: Health care organizations have changed dramatically over the last decades, with hospitals undergoing restructurings and privatizations.Objectives: The aim of this study is to enhance the understanding of the origin and prevalence of burnout in health care by investigating factors in the psychosocial work environment and comparing three Swedish emergency hospitals with different types of ownership.Design: A cross-sectional design was used.Participants: We selected a total sample of 1800 registered nurses from three acute care hospitals, one private for-profit, one private non-profit and one publicly administered. A total of 1102 questionnaires were included in the analyses.Settings: The examined ownership types were a private for-profit, a private non-profit and a traditional publicly administered hospital. All were situated in the Stockholm region, Sweden.Methods: Data were collected by questionnaires using validated instruments, in accordance with the Job Demands–Resources Model and Maslach’s Burnout Inventory. Descriptive statistics, correlation analyses, multivariate covariance analyses and multiple regression analyses were conducted.Results: The results showed that the burnout levels were the highest at the private for-profit hospital and lowest at the publicly administered hospital. However, in contrast to expectations the demands were not higher overall at the for-profit organization or lowest at the public administration unit, and overall, resources were not better in the private for-profit or worse at the publicly administered hospital. Multiple regression analyses showed that several of the demands included were related to higher burnout levels. Job resources were linked to lower burnout levels, but not for all variables.Conclusions: Profit orientation in health care seems to result in higher burnout levels for registered nurses compared to a publicly administered hospital. In general, demands were more predictive of burnout than resources, and there were only marginal differences in the pattern of predictors across hospitals.
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| 17. |
- Hansen, Niklas, et al.
(författare)
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Utbrändhet i vården : Betydelsen av krav och resurser på tre sjukhus med olika driftsformer
- 2008
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Ingår i: Arbetsmarknad & Arbetsliv. - Karlstad : Karlstads universitet, Arbetsvetenskap. - 1400-9692 .- 2002-343X. ; 14:3, s. 11-30
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Tidskriftsartikel (refereegranskat)abstract
- Hälso- och sjukvården har de senaste decennierna förändrats dramatiskt med bland annat bolagiseringar och privatiseringar. Samtidigt visar statistik på stora ohälsotal inom vårdsektorn. Studien syftar därför till att bidra till förståelsen av uppkomsten och utbredningen av utbrändhet i sjukvården. Detta görs dels genom att beakta faktorer i den psykosociala arbetsmiljön, dels genom att jämföra tre akutsjukhus i Stockholmsregionen som har olika typer av driftsform: traditionell förvaltningsdriven, bolagiserad och privat vinstdriven.
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| 18. |
- Hasselstrom, H. A., et al.
(författare)
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A 3-year Physical Activity Intervention Program Increases the Gain in Bone Mineral and Bone Width in Prepubertal Girls but not Boys: The Prospective Copenhagen School Child Interventions Study (CoSCIS)
- 2008
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Ingår i: Calcified Tissue International. - : Springer Science and Business Media LLC. - 1432-0827 .- 0171-967X. ; 83:4, s. 243-250
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to evaluate the effect of increasing the amount of time spent in physical education classes on bone mineral accrual and gain in bone size in prepubertal Danish children. A total of 135 boys and 108 girls, aged 6-8 years, were included in a school-based curriculum intervention program where the usual time spent in physical education classes was doubled to four classes (180 min) per week. The control group comprised age-matched children (62 boys and 76 girls) recruited from a separate community who completed the usual Danish school curriculum of physical activity (90 min/week). Dual-energy X-ray absorptiometry was used to evaluate bone mineral content (BMC; g), bone mineral density (g/cm(2)), and bone width at the calcaneus and distal forearm before and after 3 years of intervention. Anthropometrics and Tanner stages were evaluated on the same occasions. General physical activity was measured with an accelerometer worn for 4 days. In girls, the intervention group had a 12.5% increase (P = 0.04) in distal forearm BMC and a 13.2% increase (P = 0.005) in distal forearm scanned area compared with girls in the control group. No differences were found between the intervention and control groups in boys. Increasing the frequency of physical education classes for prepubertal children is associated with a higher accrual of bone mineral and higher gain in bone size after 3 years in girls but not in boys.
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| 19. |
- Hasselstrom, H., et al.
(författare)
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Peripheral bone mineral density and different intensities of physical activity in children 6-8 years old: The Copenhagen School Child Intervention Study
- 2007
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Ingår i: Calcified Tissue International. - : Springer Science and Business Media LLC. - 1432-0827 .- 0171-967X. ; 80:1, s. 31-38
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Tidskriftsartikel (refereegranskat)abstract
- This study aimed to evaluate the association between objectively measured habitual physical activity and calcaneal and forearm bone mineral density (BMD, g/cm(2)), one mechanically more loaded and one less loaded skeletal region, in children aged 6-8 years. BMD was measured in 297 boys and 265 girls by peripheral dual-energy X-ray absorptiometry in the forearm and calcaneus. An accelerometer registered the level of physical activity during 4 days (2 weekdays and the weekend). Weight, height, and skinfold thickness were measured. In order to establish thresholds (count center dot min(-1)) for bone-stimulating physical activity, we evaluated different definitions of vigorous physical activity. The boys had 3.2% higher distal forearm bone mineral content (BMC, P < 0.001) and 4.5% higher distal forearm BMD (P < 0.001) than the girls. They also carried out 9.7% more daily physical activity and spent 14.6-19.0% more time in vigorous physical activity (all P < 0.05) compared to the girls. In contrast, the girls had 3.8% higher calcaneal BMC (P < 0.01) and 2.5% higher calcaneal BMD (P < 0.05) than the boys. Both calcaneal and forearm BMD were significantly related to total time of daily physical activity as well as with intense physical activity above all the chosen cut-off points (all P < 0.05). The beta value for mean count center dot min(-1) physical activity was significantly lower than that for all the chosen cut-off points of vigorous activity both for calcaneal and distal forearm BMD. This study suggests that both habitual daily physical activity and amount of vigorous physical activity in children aged 6-8 years are associated with appendicular BMD.
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| 20. |
- Hasselstrom, H., et al.
(författare)
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Sex differences in bone size and bone mineral density exist before puberty. The Copenhagen School Child Intervention Study (CoSCIS)
- 2006
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Ingår i: Calcified Tissue International. - : Springer Science and Business Media LLC. - 1432-0827 .- 0171-967X. ; 79:1, s. 7-14
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Tidskriftsartikel (refereegranskat)abstract
- Background: The aim of this study was to provide normative data of bone mineral density (BMD; g/cm(2)) of the forearm and the calcaneus, evaluated by peripheral dual X ray absorbtiometry (DXA), in children aged 6 to 7 years of age and to evaluate the association with anthropometrics and sex. Materials and methods: 368 boys and 326 girls with a mean age of 6.7 +/- 0.4 years participated. BMD was measured by DXA in the forearms and the os calcanei, with average values presented in this report. Measurements of weight, height, skinfolds, the width of distal radius and ulna, and the femur condyles were collected and body composition estimated from skinfolds measurements. Results: There was no difference in calcaneus BMD when comparing boys and girls, whereas the boys had 4.5% (0.013 g/cm(2)) higher forearm BMD than the girls (P < 0.001). Calcaneal BMD (mean 0.318 g/cm(2)) was 11% higher than forearm BMD (mean 0.283 g/cm(2)). Linear relationship was found between calcaneus BMD and weight (partial r = 0.50), Fat free mass (FFM) (partial r = 0.50), Fat mass (FM) (partial r = 0.45), % body fat (partial r = 0.29) and knee width (partial r = 0.46), all P < 0.000 respectively. Adjusted for weight the relationship between calcaneus BMD and FFM, FM, %body fat and knee width disappeared. There were significant relationships between the forearm BMD and weight (partial r = 0.37), FFM (partial r = 0.39), FM (partial r = 0.28), %body fat (partial r = 0.14) and wrist width (partial r = 0.24), all P < 0.000 respectively. Adjusted for body weight, the relationship remained between forearm BMD and FFM (r = 0.10), FM (R = -0.10) and % body fat (r = -0.12), all P < 0.000 respectively. Children measured in the spring had 3.5% (P < 0.01) higher calcaneus BMD than children measured in the winter. Conclusion: Seven year old boys have higher BMD in the forearm but not in the calcaneus in comparison with girls of a similar age. Body weight is the best predictor of calcaneus BMD, accounting for 25% of the variance whereas body weight and FFM are the best predictors of forearm BMD, each accounting for 17% of the variance, respectively.
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| 21. |
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| 22. |
- Karlsson, Martin, et al.
(författare)
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Measurement of the differential cross section for the two-body photodisintegration of He-3 at theta(LAB)=90 degrees using tagged photons in the energy range 14-31 MeV
- 2009
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Ingår i: Physical Review C (Nuclear Physics). - 0556-2813. ; 80:4
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Tidskriftsartikel (refereegranskat)abstract
- The two-body photodisintegration of He-3 has been investigated using tagged photons with energies from 14-31 MeV at MAX-lab in Lund, Sweden. The two-body breakup channel was unambiguously identified by the (nonsimultaneous) detection of both protons and deuterons. This approach was made feasible by the overdetermined kinematic situation afforded by the tagged-photon technique. Proton-and deuteron-energy spectra were measured using four silicon surface-barrier detector telescopes located at a laboratory angle of 90 degrees with respect to the incident photon-beam direction. Average statistical and systematic uncertainties of 5.7% and 6.6% in the differential cross section were obtained for 11 photon-energy bins with an average width of 1.2 MeV. The results are compared to previous experimental data measured at comparable photon energies as well as to the results of two recent Faddeev calculations which employ realistic potential models and take into account three-nucleon forces and final-state interactions. Both the accuracy and precision of the present data are improved over those obtained in the previous measurements. The data are in good agreement with most of the previous results, and favor the inclusion of three-nucleon forces in the calculations.
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| 23. |
- Morrow, S A, et al.
(författare)
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High-resolution study of the C-12(gamma,p gamma')B-11 reaction using a HpGe detector to resolve excited states of B-11 through the observation of their gamma-ray decays
- 2006
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Ingår i: Physical Review C: covering nuclear physics. ; 73
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Tidskriftsartikel (refereegranskat)abstract
- Relative populations of states in 11B following the 12C(,p)11B reaction have been measured with high resolution using a 70% HpGe detector to observe decay rays from the residual nucleus. The triplet of states near 7 MeV in 11B are resolved and the measured populations compared to previous data. The analysis includes a consideration of -proton angular correlations, which was not made in the previous measurement. The new and previous results corrected for angular correlation effects agree reasonably well with calculations that include one- and two-body nuclear currents, pion exchange, and currents, under the assumption that the photons are mainly absorbed on exchanged pions.
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| 24. |
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| 25. |
- Nilsson, Björn, et al.
(författare)
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Near-threshold measurement of the He-4(gamma,n) reaction
- 2005
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Ingår i: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier BV. - 0370-2693. ; 626:1-4, s. 65-71
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Tidskriftsartikel (refereegranskat)abstract
- A near-threshold He-4(gamma, n) cross-section measurement has been performed at MAX-lab. Tagged photons from 23 < Ey < 42 MeV were directed toward a liquid He-4 target, and neutrons were detected by time-of-flight in two liquid-scintillator arrays. Seven-point angular distributions were measured for eight photon energies. The results are compared to experimental data measured at comparable energies and Recoil-Corrected Continuum Shell Model, Resonating Group Method, and recent Hyperspherical-Harmonic Expansion calculations. The angle-integrated cross-section data are peaked at a photon energy of about 28 MeV, in disagreement with the value recommended by Calarco, Berman, and Donnelly in 1983.
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| 26. |
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| 27. |
- Olsson, Fredrik, et al.
(författare)
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Consensus and opinions; quality and churn
- 2006. - 1
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Konferensbidrag (refereegranskat)abstract
- The role of the web user is under transformation from merely being an information consumer to also being a content provider, ``from information age to participation age'', in the words of Sun CEO Scott McNealy. This increase in participation is most obviously manifested by the growth of online communities, weblogs (blogs), and various forms of cooperative and participatory publication of information. One main factor in the shift towards participation is the advent of authoring tools for wikipedias and blogs. Such tools have decreased the threshold for publishing material online considerably --- it is no longer necessary to have knowledge about the technical workings of the web to be able to use it for making information available to a massive number of potential readers. (Although the lion's share of information produced will probably remain in text form in the foreseeable future, it should be noted that other modalities, such as podcasts, screencasts, films and images, are increasingly attracting interest.) The dynamic nature of blogs and wikipedias poses new challenges to the field of information access and refinement; new theories, methods, and tools for alleviating the burden of digesting information on behalf of the readers are clearly needed. This paper presents some issues on readership and participation we are currently considering.
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| 28. |
- Reiter, A., et al.
(författare)
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Measurement and simulation of the neutron response of the Nordball liquid scintillator array
- 2006
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - : Elsevier BV. - 0167-5087 .- 0168-9002. ; 565:2, s. 753-762
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Tidskriftsartikel (refereegranskat)abstract
- The response of the liquid scintillator array Nordball to neutrons in the energy range 1.5 < T-n < 10 MeV has been measured by time of flight using a Cf-252 fission source. Fission fragments were detected by means of a thin-film plastic scintillator. The measured differential and integral neutron detection efficiencies agree well with predictions of a Monte Carlo simulation of the detector which models geometry accurately and incorporates the measured, non-linear proton light output as a function of energy. The ability of the model to provide systematic corrections to photoneutron cross-sections, measured by Nordball at low energy, is tested in a measurement of the two-body deuteron photodisintegration cross-section in the range E-gamma = 14-18 MeV. After correction the present H-2 (gamma, n)p measurements agree well with a published evaluation of the large body of H-2(gamma, p)n data. (c) 2006 Elsevier B.V. All rights reserved.
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| 29. |
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| 30. |
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Staden
- 2005
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Ingår i: Fronesis. - 1404-2614. ; :18
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Annan publikation (refereegranskat)abstract
- Mer än halva mänskligheten bor nu i städer. I Fronesis nr 18 granskas stadens roll i en globaliserad kapitalism, och dess roll för flödena av människor och ekonomiska värden. Det handlar om framväxten av en nyliberal stadspolitik, byggd på nya klass- och könsorättvisor, nya gränser och kontroll.Den nyliberala staden och dess alternativI år beräknas världens stadsbefolkning överskrida antalet människor som bor på landsbygden. Det som hände i Sverige för 70 år sedan händer i dag på global nivå. Föreställningen om Syd som ruralt och jordbruksdominerat, i motsats Nord som antas vara urbant och industriellt, förefaller inte längre giltig. Det är inte i Nord som den största tillväxten av stadsbefolkningar sker, utan i Syd.Fronesis nr 18 har tema Staden. Det handlar om de växande städernas roll i den globaliserade kapitalismen. Om vilka mekanismer som länkar samman staden med de globala flödena av människor, varor och kapital. Om framväxten av en nyliberal stadspolitik, vars kärna ligger i att marknadsföra städerna för att attrahera kapital och ”rätt” arbetskraft, samtidigt som det skapas nya gränser och kontrollformer. Och om hur nya klass- och könsorättvisor växer fram som ett resultat av denna politikDet tycks som om de snabbast växande städerna i dagens Syd närs av en bräcklig informell sektor, med en explosionsartad ökning av slumområden i dess spår. Mike Davis skriver om den globala urbana befolkningsutvecklingens betydelse för Syd när det gäller demokrati, utveckling och välfärd.Tudelningen av städer i Nord behandlas i en rad texter av bland andra geograferna Saskia Sassen och Neil Smith och arkitekten Lars Mikael Raattamaa. Som regionala tillväxtmotorer och noder i ett globalt ekonomiskt nätverk tycks storstäderna allt mer frigöra sig från sina nationella kopplingar, för att likt medeltidens stadsstäder leva sina egna liv. Politikens syfte blir att attrahera och hålla kvar välutbildade och tillväxtgenererande grupper, vilket samtidigt förutsätter en ökning av lågbetalda och osäkra tjänstearbeten.Dalia Mukhtar-Landgren skriver om Malmö kommuns handlingsplan Välfärd för alla och hur diskursen kring ”problemstaden” både reflekterar och reproducerar befintliga ojämlikheter.Vi introducerar även kulturgeografen David Harveys teorier om pengarnas, tidens och rummets betydelse för den urbana utvecklingen. Ekonomen Massimo De Angelis skriver om behovet av allmänningar och diskuterar hur staden kan grunda sig på andra principer än marknadsutbytet.
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| 31. |
- Tajarobi, Farhad, 1971, et al.
(författare)
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The Impact of Dose and Solubility of Additives on the Release from HPMC Matrix Tablets-Identifying Critical Conditions
- 2009
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Ingår i: Pharmaceutical Research. - : Springer Science and Business Media LLC. - 1573-904X .- 0724-8741. ; 26:6, s. 1496-1503
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Tidskriftsartikel (refereegranskat)abstract
- Purpose. The dissolution of HPMC matrix tablets containing different amounts of highly soluble(mannitol) or poorly soluble (dicalcium phosphate, DCP) was studied to deduce the parameters criticalto release robustness.Methods. The release of HPMC and additives was studied using a modified USP II method at two paddlestirring rates, 50 and 125 rpm, at HPMC content varying from 15% to 100%.Results. At HPMC contents between 30% and 35% a critical point was identified and found crucial to therelease from the HPMC/mannitol tablets. Below this point the matrix rapidly disintegrated in a non robustmanner. At higher HPMC contents the mannitol release became increasingly diffusion controlled withmaintained matrix integrity. The release robustness was lower for HPMC/DCP than HPMC/mannitoltablets at high HPMC contents, however, lacking critical points. The critical point was interpreted as thepercolation threshold for HPMC and differences explained in terms of water transport into the matrix.Conclusion. The release robustness was lower for formulations with additives of low solubility having anerosion controlled release than for additives with higher solubility and a diffusion controlled release.However, for additives creating a steep osmotic pressure gradient, an HPMC content above thepercolation threshold becomes vital for maintaining the release robustness.
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| 32. |
- Torkildsen, Janne von Koss, et al.
(författare)
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Brain dynamics of word familiarization in 20-month-olds: Effects of productive vocabulary size
- 2009
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Ingår i: Brain and Language. - : Elsevier BV. - 1090-2155 .- 0093-934X. ; 108:2, s. 73-88
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Tidskriftsartikel (refereegranskat)abstract
- The present study investigated the brain mechanisms involved during young children's receptive familiarization with new words, and whether the dynamics of these mechanisms are related to the child's productive vocabulary size. To this end, we recorded event-related potentials (ERPs) from 20-month-old children in a pseudoword repetition task. Results revealed distinct patterns of repetition effects for children with large and small productive vocabularies. High producers showed evidence of recognizing the novel words already after three presentations, while the low producers needed five presentations to display a recognition effect. The familiarization process was manifested in the modulations of two components, the N200-400 and a later fronto-central component, which appeared to increase in amplitude until a certain level of encoding was reached and then decrease with further repetition. These findings suggest a relation between the onset of the productive vocabulary spurt and the rate of receptive word familiarization. (C) 2008 Elsevier Inc. All rights reserved.
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| 33. |
- Torkildsen, Janne von Koss, et al.
(författare)
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Productive Vocabulary Size Predicts Event-related Potential Correlates of Fast Mapping in 20-Month-Olds
- 2008
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Ingår i: Journal of Cognitive Neuroscience. - : MIT Press - Journals. - 1530-8898 .- 0898-929X. ; 20:7, s. 1266-1282
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Tidskriftsartikel (refereegranskat)abstract
- Although it is well documented that children undergo a productive vocabulary spurt late in the second year, it is unclear whether this development is accompanied by equally significant advances in receptive word processing. In the present study, we tested an electrophysiological procedure for assessing receptive word learning in young children, and the impact of productive vocabulary size for performance in this task. We found that 20-month-olds with high productive vocabularies displayed an N400 incongruity effect to violations of trained associations between novel words and pictures, whereas 20-month-olds with low productive vocabularies did not. However, both high and low producers showed an N400 effect for common real words paired with an incongruous object. These findings indicate that there may be substantial differences in receptive fast mapping efficiency between typically developing children who have reached a productive vocabulary spurt and typically developing children who have not yet reached this productive spurt.
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