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We study the phase diagrams of the s-band and d-band Hubbard model in two dimensions including electron correlations. While the ferromagnetic instability in the s-band case occurs only near the Van Hove singularity, ferromagnetism is more stable in the d-band model, and the values of the Stoner parameters in transition metals are reduced below their LDA values.(14 refs)
Endovascular treatment of aorto-iliac occlusive disease (AIOD) is well established, but to maintain long-term patency, secondary interventions are common. Multiple stents and iliac artery tortuosity often make it difficult to evaluate stent compression intra-operatively and this might be a cause for later failure. Completion angiography (CA) and pressure gradient (PG) measurement are often used to
This paper outlines possible strategies for evaluation of group relations conferences. Based on comparison of group relations and sensitivity training, the evaluations made of the latter are critically reviewed. Restriction to outcomes, means, variability measures, experimental paradigms and effect-without-process studies, instrumental views on learning and less developed conceptions of groups ham
Pavlovian eyeblink conditioning is a useful experimental model for studying adaptive timing, an important aspect of skilled movements. The conditioned response (CR) is precisely timed to occur just before the onset of the expected unconditioned stimulus (US). The timing can be changed immediately, however, by varying parameters of the conditioned stimulus (CS). It has previously been shown that in
Background and Objective: The size of laser-induced coagulated lesions produced in porcine muscle in vitro using a cylindrical diffusing fiber tip and a conductive heat source, made by covering the diffuser with a hollow steel needle, were compared to investigate the influence of charring. Materials and methods: Light from a Nd: YAG laser was utilized for thermotherapy. A theoretical model for cal
Etikprövningslagen bör skärpas på en rad punkter och det rättsliga ansvaret utsträckas från forskningshuvudman till att även innefatta forskningsledaren, skriver docenter, professorer med flera i en slutreplik.
The essay documents indications for cracks in the transatlantic relationship, identifies their potential causes, and outlines possible policy responses. Taking up Fukuyama’s question of whether the West “is still a coherent concept,” we draw attention to the growing dissension in the fields of environmental politics, security, and human rights. Subsequently, we offer preliminary explanations for t
De flesta fasader drabbas förr eller senare av någon form av missfärgning. Detta skadeblad behandlar en speciell typ av missfärgning, kalkutfällning.
BACKGROUND: There is a lack of understanding of the processes that regulate differentiation in the prostate. OBJECTIVE: To determine localisation, activity, and regulation of cytodifferentiation-modulatory proteins in the human adult prostate. DESIGN, SETTINGS, AND PARTICIPANTS: Eighteen volunteering patients with organ-confined prostate cancer were prospectively enrolled at a single university ho
