5,661 research outputs found
"Meidän oma Yrjö" : Eemil Nestor Setälä ja Yrjö Wichmann yhteistyökumppaneina
No full textE. N.
Setälä ja Yrjö Wichmann työskentelivät kollegoina sekä Helsingin
Yliopistossa että useissa tieteellisissä seuroissa suomen ja sen
sukukielten tutkimuksen arvostettuina edustajina. Varsinkin uransa
alkutaipaleella he olivat perheystäviä ja yhteistyökumppaneita,
kuitenkin niin, että Setälällä oli aina selvä johtoasema. Sen suomin
valtuuksin hän ohjasi ja määräsi Wichmannia ja muitakin nuorempia
kollegoitaan omasta näkökulmastaan tarkoituksenmukaisiin työtehtäviin ja
luottamustoimiin, jotka saattoivat olla hyvinkin työläitä ja
pitkäkestoisia. Artikkelissa ei kuvata Setälän ja Wichmannin
tieteellisen tutkimustyön sisältöjä eikä sen tuloksia. Sen sijaan
käsitellään heidän tieteenalansa yleistä tilannetta ja kuvataan heidän
työskentelyään tieteellisinä kollegoina 1800-luvun lopun ja 1900-luvun
ensimmäisten vuosikymmenten aikana. Artikkeli perustuu esitelmään, joka
pidettiin Suomalais-Ugrilaisen Seuran järjestämässä Yrjö Wichmann
-seminaarissa Helsingissä 19.10.2018.</p
THE MOUSE HOMOLOG TO THE RAS-RELATED YEAST GENE YPT1 MAPS ON CHROMOSOME-11 CLOSE TO THE WOBBLER (WR) LOCUS
No full textWICHMANN H, Jockusch H, GUENET JL, GALLWITZ D, KAUPMANN K. THE MOUSE HOMOLOG TO THE RAS-RELATED YEAST GENE YPT1 MAPS ON CHROMOSOME-11 CLOSE TO THE WOBBLER (WR) LOCUS. MAMMALIAN GENOME. 1992;3(8):467-468
Iterated Function System and diffusion in the presence of traps
No full textThe escape probability ξx from a site x of a one-dimensional disordered lattice with trapping is treated as a discrete dynamical evolution by random iterations over nonlinear maps parametrized by the right and left jump probabilities. The invariant measure of the dynamics is found to be a multifractal. However the measure becomes uniform over the support when the disorder becomes weak for any nonzero trapping probability. Possible implications of our findings to diffusion processes are brought out briefly
Umwelt und Gesundheit
No full textFehr R, Kobusch A-B, Wichmann H-E. Umwelt und Gesundheit. In: Hurrelmann K, ed. Gesundheitswissenschaften: Handbuch für Lehre, Forschung und Praxis. Weinheim [u.a.]: Beltz; 1993: 295-314
Umwelt und Gesundheit
No full textFehr R, Hornberg C, Wichmann H-E. Umwelt und Gesundheit. In: Hurrelmann K, Razum O, eds. Handbuch Gesundheitswissenschaften. Vol 5. Weinheim: Beltz; 2012: 573-608
Fracture behaviour of fumed silica/epoxy nanocomposites
No full textThe paper shows the results of ail experimental programme oriented to the manufacturing and characterisation of nanocomposites based on epoxy resin modified with fumed silica nanaparticles (0. 1, 0.3 and 0.5 vol.%) with different surface treatments (unmodified, AMEO and GLYMO). The resulting degree of dispersion and the interfacial adhesion were investigated by TEM and SEM. Previous tensile and fracture toughness properties are discussed together with new results on the fatigue behaviour under mode 1 loading. The fracture toughness K(Ic), turned out to be significantly increased and a positive trend towards the improvement in the crack propagation threshold under fatigue was observe
Influence of surface treatment on mechanical behaviour of fumed silica/epoxy resin nano-composites
No full textThe present paper shows the potential of fumed silica as nano-reinforcements in polymers, by considering the limitations and challenges one has to face dealing with nanoparticles in general. The dominating effect of the manufacturing route and surface properties of fumed silica influencing the resulting degree of dispersion and the interfacial adhesion were investigated by electron microscopy (TEM, SEM). The resulting (fracture-) mechanical properties of the fumed silica/epoxy composites were investigated for volume contents of 0.5 vol% and below. Independent of the surface modification, static and dynamic modulus decreased slightly by adding the fumed silica. Hence, the fracture toughness K-Ic turned out to be significantly increased (54%) adding only 0.5 vol% of surface modified fumed silica
Basal Ganglia Neurons in Healthy and Parkinsonian Primates Generate Recurring Sequences of Spikes
No full textThese data are the source data for the manuscript entitled "Basal Ganglia Neurons in Healthy
and Parkinsonian Primates Generate Recurring Sequences of Spikes", authored by Adriana Galvan
and Thomas Wichmann (Emory University, Atlanta, GA).
The data are interspike interval measurements generated from electrophysiological recordings
of spontaneous spiking activities of single neurons in the basal ganglia of awake monkeys, before
and after rendering them parkinsonian by treatment with MPTP. THe animals were not engaged in any
task or other structured activity.
The data format is a one-column listing of successive interspike intervals, and are presented in
milliseconds. The data are structured into different folders:
GPe normal - data collected in the external pallidal segment, under normal conditions
GPe MPTP - data collected in the external pallidal segment, under parkinsonian conditions
STN normal - data collected in the subthalamic nucleus, under normal conditions
STN MPTP - data collected in the subthalamic nucleus, under parkinsonian conditions
GPi normal - data collected in the internal pallidal segment, under normal conditions
GPi MPTP - data collected in the internal pallidal segment, under parkinsonian conditions
A 'Read Me' file is included, containing these explanations.
For questions, please contact the corresponding author, Dr. Thomas Wichmann ([email protected])
“The Intersection between Justice and Home Affairs and the European Neighbourhood Policy: Taking Stock of the Logic, Objectives and Practices.” CEPS Working Document No. 275, October 2007
No full textThis paper claims that the European Neighbourhood Policy (ENP) of the EU, and in particular the elements related to justice and home affairs (JHA), is a complex, multilayered initiative that incorporates different logics and instruments. To unravel the various layers of the policy, the paper proceeds in three steps: firstly, it lays out some facts pertaining to the origins of the ENP, as its ‘origins’ arguably account for a number of the core tensions. It then presents the underlying logic and objectives attributed to JHA cooperation, which can be derived from the viewpoints voiced during policy formulation. The paper goes on to argue that despite the existence of different logics, there is a unifying objective, which is to ‘extra-territorialise’ the management of ‘threats’ to the neighbouring countries. The core of the paper presents the various policy measures that have been put in place to achieve external ‘threat management’. In this context it is argued that the ’conditionality-inspired policy instruments’, namely monitoring and benchmarking of progress, transfer of legal and institutional models to non-member states and inter-governmental negotiations, contain socialisation elements that rely on the common values approach. This mix of conditionality and socialisation instruments is illustrated in two case studies, one on the fight against terrorism and one on irregular migration. Finally, the paper recommends that the EU draft an Action-Oriented Paper (AOP) on JHA cooperation with the ENP countries that indicates how the EU intends to balance the conflicting objectives and instruments that are currently present in the JHA provisions of the ENP
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