263 research outputs found
Hvordan kan rammer og begrensninger for friimprovisasjon pĂĽvirke forutsetningen for kreative prosesser?
Masteroppgave i utøvende musikk- Universitetet i Agder 201
Escape angles in bulk chi(2) soliton interactions
We develop a theory for non-planar interaction between two identical type I
spatial solitons propagating at opposite, but arbitrary transverse angles in
quadratic nonlinear (or so-called chi(2)) bulk media. We predict quantitatively
the outwards escape angle, below which the solitons turn around and collide,
and above which they continue to move away from each other. For in-plane
interaction the theory allows prediction of the outcome of a collision through
the inwards escape angle, i.e. whether the solitons fuse or cross. We find an
analytical expression determining the inwards escape angle using Gaussian
approximations for the solitons. The theory is verified numerically.Comment: V1: 4 pages, 4 figures. V2: Accepted for publication in Physical
Review E. 5 pages, 4 figures. Fig. 2 changed to be for fixed soliton width
and to show soliton power. New simple relations in terms of power and pahse
mismatch are include
Faktoreksponering i det norske fondsmarkedet : en empirisk studie av aktive aksjefond og systematiske risikofaktorer
Denne utredningen analyserer aktivt forvaltede norske aksjefond i perioden 1983-2014.
FormĂĽlet med oppgaven er ĂĽ se om faktorer fra utvalgte flerfaktormodeller kan forklare
avkastningen til fondene. Herunder om noen oppnĂĽr meravkastning etter justering for
faktorene, eller om eventuell meravkastning kun skyldes eksponering mot systematiske
risikofaktorer. Motivasjonen for denne tilnĂŚrmingen er manglende litteratur pĂĽ omrĂĽdet for
det norske markedet. Studier pü faktorene har blitt gjennomført av NÌs et al. (2008), men de
fokuserte pü Oslo Børs generelt og ikke pü aksjefond spesielt.
Innledningsvis analyseres fondene ved bruk av CAPM og Fama og French sin
trefaktormodell, men hovedfokus ligger pĂĽ femfaktormodellen. Denne bestĂĽr av faktorene;
markedet, størrelse, bok/pris, momentum og likviditet.
Vi finner at fondene som oppnĂĽr meravkastning i CAPM, mister denne ved justering for de
fire øvrige faktorene. Likevel ser vi at noen fü fond oppnür meravkastning i
femfaktormodellen. Dette skyldes i hovedsak negativ eksponering mot størrelsesfaktoren.
Generelt observerer vi at svĂŚrt mange fond er signifikant positivt eksponert mot
størrelsesfaktoren og mange er negativt eksponert mot likviditetsfaktoren. De øvrige faktorene
er mindre fremtredende. Totalt sett kan mye av avkastningen til fondene forklares av
eksponering mot de fem faktorene.
Videre undersøkes det om fond med ulik forvaltningskapital eller ulike forvaltningskostnader
har forskjellig eksponering mot faktorene. Vi ser ogsĂĽ nĂŚrmere pĂĽ noen fond som fremstĂĽr
som mer indeksnÌre enn de andre, for ü undersøke om vi har sükalte skapindeksfond i vürt
utvalg.
Resultatene viser at forvaltningskapital er tilnĂŚrmet uten betydning for faktoreksponeringen
til fondene, men at forvaltningskostnader spiller en større rolle. Vi finner at fond med høye
kostnader er mindre indeksnĂŚre. De investerer ogsĂĽ mer i smĂĽ selskaper, og justert for dette
oppnĂĽr de ikke meravkastning. I analysen av de mest indeksnĂŚre fondene finner vi at enkelte
fond har svÌrt høy korrelasjon med indeks, selv om de er vesentlig dyrere enn indeksfond.nhhma
Low temperature lignocellulose pretreatment: effects and interactions of pretreatment pH are critical for maximizing enzymatic monosaccharide yields from wheat straw
BACKGROUND: The recent development of improved enzymes and pentose-using yeast for cellulosic ethanol processes calls for new attention to the lignocellulose pretreatment step. This study assessed the influence of pretreatment pH, temperature, and time, and their interactions on the enzymatic glucose and xylose yields from mildly pretreated wheat straw in multivariate experimental designs of acid and alkaline pretreatments. RESULTS: The pretreatment pH was the most significant factor affecting both the enzymatic glucose and xylose yields after mild thermal pretreatments at maximum 140°C for 10 min. The maximal enzymatic glucose and xylose yields from the solid, pretreated wheat straw fraction were obtained after pretreatments at the most extreme pH values (pH 1 or pH 13) at the maximum pretreatment temperature of 140°C. Surface response models revealed significantly correlating interactions of the pretreatment pH and temperature on the enzymatic liberation of both glucose and xylose from pretreated, solid wheat straw. The influence of temperature was most pronounced with the acidic pretreatments, but the highest enzymatic monosaccharide yields were obtained after alkaline pretreatments. Alkaline pretreatments also solubilized most of the lignin. CONCLUSIONS: Pretreatment pH exerted significant effects and factor interactions on the enzymatic glucose and xylose releases. Quite extreme pH values were necessary with mild thermal pretreatment strategies (T ⤠140°C, time ⤠10 min). Alkaline pretreatments generally induced higher enzymatic glucose and xylose release and did so at lower pretreatment temperatures than required with acidic pretreatments
Use of Peptide Arrays for Identification and Characterization of LIR Motifs
This is a post-peer-review, pre-copyedit version of an article published in Methods in Molecular Biology. The final authenticated version is available online at: http://dx.doi.org/10.1007/978-1-4939-8873-0_8The mammalian ATG8 proteins (LC3A-C/GABARAP, GABARAPL1, and GABARAPL2) are small ubiquitin-like proteins critically involved in macroautophagy. Their processed C-termini are posttranslationally conjugated to a phosphatidylethanolamine moiety, enabling their insertion into the lipid bilayers of both the inner and outer membranes of the forming autophagosomes. The ATG8s bind a diverse selection of proteins including cargo receptors for selective autophagy, members of the core autophagy machinery, and other proteins involved in formation, transport, and maturation (fusion to lysosomes) of autophagosomes. Protein binding to the ATG8s is in most cases mediated by short, conserved sequence motifs known as LC3-interacting regions (LIRs). Here, we present a protocol for identifying putative LIR motifs in a whole protein sequence using peptide arrays generated by SPOT synthesis on nitrocellulose membranes. The use of two-dimensional peptide arrays allows for further identification of specific residues critical for LIR binding
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