93,192 research outputs found
Mangani-pargasite, NaCa2(Mg4Mn3+)(Si6Al2)O22(OH)2, a new mineral species of the amphibole supergroup
No full textMangani-pargasite, ideally NaCa2(Mg4Mn3+)(Si6Al2)O22(OH)2, is a new mineral species of the calcium amphibole subgroup of the amphibole supergroup. The type specimen was found on the mine dump of the Långban Fe-Mn-(Ba-As-Pb-Sb) deposit in Värmland, Sweden. Crystal chemical analyses resulted in the empirical chemical formula: A(Na0.90Pb0.07K0.03)Σ1.00B(Ca1.93Mn2+0.07)Σ2.00C(Mg4.25Mn3+0.39Al0.26 Fe3+0.10)Σ5.00T(Si6.35Al1.65)Σ8.00O22W(OH)2. In order to complete the description of this newly approved (IMA 2018-151) mineral we report here additional data to those published in papers by Jonsson and Hålenius (2010) and Hålenius and Bosi (2012). Mangani-pargasite is biaxial positive, with a=1.635(5), b=1.645(5), g=1.660(5) and the measured optic angle 2V is 85(5)°. The dispersion is weak (r>v), and the optic orientation is: Y||b; Z^c=25(3)°. Mangani-pargasite is red to brownish red with weak pleochroism; X=pale reddish brown, Y=pale reddish brown and Z=pale brownish red; X≈Y>Z. The unit-cell parameters are a=9.9448(5), b=18.0171(9), c=5.2829(3) Å, b=105.445(3)°, V=912.39(9) Å3, Z=2, space group C2/m. The ten strongest reflections in the X-ray powder diffraction pattern [d-values in Å, I, (h k l)] are: 8.420, 29, (110); 3.368, 17, (131), 3.279, 49, (240); 3.141, 100, (310); 2.817, 44, (33 0); 2.698, 21, (151); 2.389, 18, (350); 1.904, 29, (510); 1.650, 22, (461) and 1.448, 46, (661)
Det kr\ue4vs ett ekonomiskt paradigmskifte f\uf6r att tackla klimatkrisen
No full textI dagens ekonomiska ber\ue4kningar \uf6verskattas kostnaderna f\uf6r klimat\ue5tg\ue4rder, vilket skapar en klimatpolitisk bromskloss. Det bristf\ue4lliga fokuset p\ue5 kortsiktigt kostnadseffektiva utsl\ue4ppsminskningar g\uf6r att den nationella omst\ue4llningen sannolikt b\ue5de f\uf6rdyras och f\uf6rdr\uf6js, skriver Max Jonsson och Hampus Andr\ue9
Author accepted manuscript: Putting Action into Testing: Enacted Retrieval Benefits Long-Term Retention more than Covert Retrieval.
No full textKubik V, Jonsson F, de Jonge M, Arshamian A. Author accepted manuscript: Putting Action into Testing: Enacted Retrieval Benefits Long-Term Retention more than Covert Retrieval. Quarterly journal of experimental psychology (2006). 2020
Letter from Lloyd Berkner to Erik Jonsson
No full textLloyd Berkner, President of the GRCSW/SCAS, is discussing details with Erik Jonsson, GRCSW/SCAS co-founder, concerning President John F. Kennedy's impending visit to Dallas in November 1963. The document is found in Series 18, Box 5, Folder 21 of the GRCSW/SCAS Collection
Intervention study on the phases of the moon with a 3D-model : Younger students´ understanding about the moon phases in primary school
No full textInterventionsstudien undersökte förståelse om månens faser i årskurs 2. Inom området finns det mycket forskning om digitala 3D-modeller som visar en positiv effekt på elevers förståelse om astronomiska fenomen. Däremot finns det inte lika mycket forskning om fysiska modeller, därav vill vi undersöka om en fysisk 3D-modell kan stödja eleverna i deras förståelse om månens faser och se om den hjälper till att förhindra elevers missuppfattningar som tidigare forskning nämner att elever kan ha. Studiens frågeställningar är: (1) Hur kan tillämpning av en fysisk 3D-modell stödja elevers förståelse av månens faser i åk F-3? samt (2) Vilka tecken på förståelse av månens faser visar elever före och efter en intervention? I interventionen arbetade eleverna med en 3D-modell som representerade solen, månen och jorden. Under genomförandet var de indelade i grupper om 3–4 personer där de demonstrera och diskutera frågor om månens faser. Det teoretiska ramverket för studien är conceptual change. Interventionen inkluderade ett för- och eftertest för att synliggöra kognitiva processer och elevers konceptuella förändring. Bearbetning och analys av datamaterialet har genomförts utifrån en tematisk analys samt conceptual change teorin. I studien visade eleverna flera tecken på förståelse för månens faser i tillämpningen av 3D-modellen. Exempelvis demonstrerade de olika månfaser och vart månen skulle vara placerad i förhållande till jorden och solen. Trots visad förståelse vid arbetet med 3D-modellen gick det att urskilja missuppfattningar i eftertestet
Cathodoluminescence read-out of the structural phase of gallium nanoparticles
No full textWe report on a method of phase identification of gallium nanoparticles via their cathodoluminescence when excited by a scanning electron beam. This feature can be used for high-density phase change memory element
How are empowering leadership, self-efficacy and innovative behavior related to nurses' agency in distributed leadership in Denmark, Italy and Israel?
No full textAim: The purpose of the study was to introduce the concept of distributed leadership to international nursing management by conducting a cross-national investigation of its relationships with empowering nursing leadership, nurses' work self-efficacy and nurses' innovative behaviour. Background: Distributed leadership theory suggests that when more people lead processes together, innovation will be superior to solo leadership. However, we need knowledge about how nurse managers may enhance nurses' distributed leadership agency (DLA), and whether such results are generalizable across countries. Method: The cross-national survey with an overall purposeful sampling method used questionnaire data from hospital nurses from Israel (n = 239), Italy (n = 226) and Denmark (n = 709). We used validated scales measuring Empowering Leadership, Self-efficacy, Innovative Work Behavior and DLA. Results: The results from all three countries showed that empowering leadership and work self-efficacy were positively related to DLA, which, in turn, was also related to more innovation. Conclusion: The results may imply that nursing managers can increase workplace innovativeness by adopting an empowering leadership style that supports nurses' self-efficacy and distributes leadership tasks. Implications for Nursing Management: The cross-country robustness of the results may encourage further research in distributed leadership in nurse management, notably with a focus on causal mechanisms
Optimization of optical size control in gallium nanoparticle growth
No full textWe report on a systematic study of the influence of irradiating optical power on the size of gallium nanoparticles grown from an atomic beam. A minimum median diameter is found to be 45 nm
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