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| 3. |
- Hultman, Glenn, 1947-, et al.
(författare)
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Avslutande reflektioner och slutsatser.
- 2004
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Ingår i: Lärande och förändring i organisationer. Om pedagogik i arbetslivet.. - Lund : Studentlitteratur. - 9144035152 - 9789144035154 ; , s. 295-305
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- I fokus för denna antologi står frågor om lärande, förändring och ledarskap inom olika typer av verksamhet. Syftet är att bidra till en bred genomlysning av dessa begrepp utifrån såväl teoretiska som empiriska analyser. Vi vill härigenom försöka utmana vanligt förekommande uppfattningar om lärande, förändring och ledarskap. Framställningen baseras i stor utsträckning på egna studier som genomförts under de senaste åren. Dessa studier har i samtliga fall utgått från människors dagliga arbete i olika lokala verksamheter - inom företag, hälso- och sjukvård, omsorgsverksamhet och skola. De studier som redovisas speglar därmed också vardagen på arbetsplatser inom olika sektorer av svenskt arbetsliv. I flera av studierna har det också varit möjligt att studera dessa verksamheter över längre tid och på så sätt belysa de studerade processernas drivkrafter och inre dynamik. Boken kan användas som kurslitteratur vid universitet och högskolor samt som fördjupningslitteratur i anslutning till ledar- eller personalutbildningar. Den vänder sig också till forskare, politiker, företrädare för arbetsmarknadens parter samt praktiskt verksamma med intresse för frågor om lärande, kompetensutveckling och förändringsprocessser i organisationer.
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| 4. |
- Kakanakova-Georgieva, Anelia, 1970-, et al.
(författare)
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Epitaxial growth of AlN layers on SiC substrates in a hot-wall MOCVD system
- 2002
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Ingår i: Phys. Stat. Sol. (c), Vol. 0, Issue 1. - : Wiley. ; , s. 205-208
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Konferensbidrag (refereegranskat)abstract
- In this study we report the successful growth of AlN and AlN/GaN on SiC substrates in a MOCVD process based on a hot-wall susceptor design. Different features of AlN growth are established depending on the total reactor pressure, temperature, off-cut SiC substrate orientation and V-to-III gas-flow ratio. The feasibility of the hot-wall MOCVD concept is demonstrated by the performance of AlN/GaN structures with state-of-the-art properties with strong potential for further optimization. A narrower X-ray rocking curve over the asymmetric 10.4 than the symmetric 00.2 reflection clearly underlines the high overall crystal quality of the GaN layers on AlN buffers grown in this type of MOCVD reactor.
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| 5. |
- Kakanakova-Georgieva, A, et al.
(författare)
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Implementation of hot-wall MOCVD in the growth of high-quality GaN on SiC
- 2003
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Ingår i: Materials Science Forum, Vols. 433-436. - : Trans Tech Publications. ; , s. 991-994
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Konferensbidrag (refereegranskat)abstract
- This paper reports on the growth of high-quality GaN layers on SiC substrates by hotwall MOCVD. Use of AlN buffer with a thickness exceeding 50 nm is employed for the GaN deposition and it is found to encompass most of the misfit defects. A narrower X-ray rocking curve over asymmetric than over symmetric reflection is measured - full width at a half maximum (FWHM) of 350 arcsec vs. FWHM of 490 arcsec for 10.4 and 00.2 peaks, respectively, indicating high overall quality of the film. The free exciton photoluminescence emission peak has rather narrow FWHM of 5 meV. The typical thickness of the GaN layers is about 2 mum and they are completely depleted according to the capacitance-voltage profiling, which corresponds to estimated residual doping of less than 5x10(14) cm(-3). Only in some cases when the GaN layer is not depleted, deep level transient spectroscopy is performed and two deep traps with activation energies of 0.26 and 0.59 eV below the conduction band are measured.
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| 6. |
- Kakanakova-Georgieva, Anelia, 1970-, et al.
(författare)
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Sublimation epitaxy of AlN on SiC : Growth morphology and structural features
- 2004
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Ingår i: Journal of Crystal Growth. - : Elsevier BV. - 0022-0248 .- 1873-5002. ; 273:1-2, s. 161-166
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Tidskriftsartikel (refereegranskat)abstract
- In order to study the development of individual AlN crystallites, sublimation epitaxy of AlN was performed on 4H-SiC, off-axis substrates in an inductively heated setup. Growth process variables like temperature, extrinsic nitrogen pressure and time were changed in an attempt to favor the lateral growth of individual AlN crystallites and thus open possibilities to prepare continuous patterns. Scanning and transmission electron microscopy and cathodoluminescence were used to obtain plan-view and cross-sectional images of the grown patterns and to study their morphology and structural features. The growth at 1900°C/200mbar results in AlN pattern consisting of individual single wurzite AlN crystallites with plate-like shape aligned along [1 1̄ 0 0] direction. The only defects these AlN crystallites contain are threading dislocations, some of which are terminated by forming half-loops. Because of the uniform distribution of the crystallites and their high structural perfection, this AlN pattern could represent interest as a template for bulk AlN growth. Alternative growth approaches to AlN crystallite formation are possible resulting in variation of the final AlN pattern structure. From a viewpoint of obtaining continuous patterns, the more favorable growth conditions involve applying of increased extrinsic gas pressure, 700 mbar in our case. © 2004 Elsevier B.V. All rights reserved.
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| 7. |
- Levlin, Erik, 1951-, et al.
(författare)
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Effects of phosphorus recovery requirements on Swedish sludge management
- 2002
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Ingår i: Water Science and Technology. - : IWA Publishing. - 0273-1223 .- 1996-9732. ; 46:4-5, s. 435-440
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Tidskriftsartikel (refereegranskat)abstract
- Expected requirements of phosphorus recovery, restrictions on sludge disposal on landfill, and difficulties in obtaining consensus on sludge use on agricultural land has led to several development works in Sweden to change sludge management methods. Especially sludge fractionation has gained interest including following steps to recover products and separate transfer of toxic substances into a small stream. Commercial systems are offered based on technology by Cambi/KREPRO and BioCon and other companies and many other methods are under development. Iron salts are widely used in Sweden as precipitation agents for phosphorus removal and this technology has some disadvantages for phosphorus recovery compared with the use of biological phosphorus removal. The amount of chemicals needed for a KREPRO or a BioCon system was calculated for a treatment plant which has an addition of iron salt resulting in 1,900 mole Fe per tonne DS. The result was compared with the chemical consumption of recovery systems installed at plants with lower use of iron for precipitation. The chemical consumption in equivalents per tonne DS was found to be 5,000 + 6,000 * (molar ratio iron to phosphorus).
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| 8. |
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Lärande och förändring i organisationer. Om pedagogik i arbetslivet
- 2004
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Samlingsverk (redaktörskap) (övrigt vetenskapligt/konstnärligt)abstract
- I fokus för denna antologi står frågor om lärande, förändring och ledarskap inom olika typer av verksamhet. Syftet är att bidra till en bred genomlysning av dessa begrepp utifrån såväl teoretiska som empiriska analyser. Vi vill härigenom försöka utmana vanligt förekommande uppfattningar om lärande, förändring och ledarskap. Framställningen baseras i stor utsträckning på egna studier som genomförts under de senaste åren. Dessa studier har i samtliga fall utgått från människors dagliga arbete i olika lokala verksamheter - inom företag, hälso- och sjukvård, omsorgsverksamhet och skola. De studier som redovisas speglar därmed också vardagen på arbetsplatser inom olika sektorer av svenskt arbetsliv. I flera av studierna har det också varit möjligt att studera dessa verksamheter över längre tid och på så sätt belysa de studerade processernas drivkrafter och inre dynamik.Boken kan användas som kurslitteratur vid universitet och högskolor samt som fördjupningslitteratur i anslutning till ledar- eller personalutbildningar. Den vänder sig också till forskare, politiker, företrädare för arbetsmarknadens parter samt praktiskt verksamma med intresse för frågor om lärande, kompetensutveckling och förändringsprocessser i organisationer.
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| 11. |
- Persson, Per, et al.
(författare)
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Structural defects in electrically degraded 4H-SiC PiN diodes
- 2002
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Ingår i: Materials Science Forum, Vols. 389-393. ; , s. 423-426
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Konferensbidrag (refereegranskat)abstract
- Triangular structural defects, occasionally generated during long term operation of 4H-SiC pin diodes, are known to negatively affect the forward characteristics of the diode. We have used synchrotron white beam X-ray topography, scanning electron microscopy, in situ cathodo luminescence and transmission electron microscopy for characterizing the structure and formation mechanisms of such defects. It is shown from high-resolution images that the defect results from glide slip on the (0001) basal plane. The defect consists of a stacking fault bound by two partial dislocations with Burgers vectors 1/3<11 (1) over bar0> and 1/3<01 (1) over bar0>. The fault is a means for stress relaxation in the epilayer, near the contact layer using an existing dislocation as a nucleation source.
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| 12. |
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| 13. |
- Tonkonogi, Michail, et al.
(författare)
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The role of phosphorylcreatine in the regulation of mitochondrial respiration in human skeletal muscle.
- 2001
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Ingår i: Journal of Physiology. - 0022-3751 .- 1469-7793. ; 537:3, s. 971-978
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Tidskriftsartikel (refereegranskat)abstract
- 1. The role of phosphorylcreatine (PCr) and creatine (Cr) in the regulation of mitochondrial respiration was investigated in permeabilised fibre bundles prepared from human vastus lateralis muscle. 2. Fibre respiration was measured in the absence of ADP (V0) and after sequential additions of submaximal ADP (0.1 mm ADP, Vsubmax), PCr (or Cr) and saturating [ADP] (Vmax). 3. Vsubmax increased by 55% after addition of saturating creatine (P< 0.01; n = 8) and half the maximal effect was obtained at 5 mm [Cr]. In contrast, Vsubmax decreased by 54% after addition of saturating phosphorylcreatine (P< 0.01; n = 8) and half the maximal effect was obtained at 1 mm [PCr]. Vmax was not affected by Cr or PCr. 4. Vsubmax was similar when PCr and Cr were added simultaneously at concentrations similar to those in muscle at rest (PCr/Cr = 2) and at low-intensity exercise (PCr/Cr = 0.5). At conditions mimicking high-intensity exercise (PCr/Cr = 0.1), Vsubmax increased to 60% of Vmax (P< 0.01) vs. rest and low-intensity exercise). 5. Eight of the subjects participated in a 16 day Cr supplementation programme. Following Cr supplementation, V0 decreased by 17% (P< 0.01) vs. prior to Cr supplementation), whereas ADP-stimulated respiration (with and without Cr or PCr) was unchanged. 6. For the first time evidence is given that PCr is an important regulator of mitochondrial ADP-stimulated respiration. Phosphorylcreatine decreases the sensitivity of mitochondrial respiration to ADP whereas Cr has the opposite effect. During transition from rest to high-intensity exercise, decreases in the PCr/Cr ratio will effectively increase the sensitivity of mitochondrial respiration to ADP. The decrease in V0 after Cr supplementation indicates that intrinsic changes in membrane proton conductance occur.
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