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Aaltodoc Publication Archive
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7461 Publications
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  • Observation of a topological transition in the 3He-A vortices

    Vortices in 3He-A in low magnetic fields (H20 mT) have been studied by ultrasonics. A first-order phase change between two vortex types, with dissimilar sound absorption, has been found. The magnetic field at the transition is on the order of the dipolar field Hd. The observed change occurs between continuous vortex textures with different topological charges in the field (where is the magnetic anisotropy vector). Peer reviewed

    Laadukkaan sisäympäristön lisäarvo - SY-ohjelman WP3:n tutkimusraportti

    Raportti on syntynyt yhteistyössä Aalto-yliopiston kiinteistöliiketoiminnan tutkimusryhmän tutkijoiden, hankkeeseen osallistuneiden yritysten sekä RYM Oy:n kanssa. Raportti perustuu vuosina 2011-2014 toteutetun Tekesin rahoittaman Sisäympäristö –tutkimusohjelman, erityisesti sen 3. työpaketin, ”Knowledge intensive space markets” (KISS), tuloksiin. Raportin tavoitteena on avata kiinteistö- ja kiinteistöalan ammattilaisille näkökulmia, miten laadukas sisäympäristö voi käyttäjien lisäksi tuot...

    Density-functional approaches to interacting electrons in quantum dots

    Quantum dots are man-made nanoscale structures. As they show typical atomic properties they are often referred to as artificial atoms. The wave functions, shell structure, and energy levels are usually reminiscent of real atomic systems. A wide variety of geometries is possible by choosing appropriate materials and external confinement: one-dimensional rods, two-dimensional pancakes, or three-dimensional spheres. Since quantum dots are nanoscale systems, quantum mechanics is required for thei...

    Gradient correction for positron states in solids

    First-principles calculations of positron-annihilation characteristics in solids are usually based on the local-density approximation (LDA) for positron-electron correlation. The LDA systematically overestimates the annihilation rate. As a remedy we introduce a generalized gradient approximation (GGA). Our results for several metals and semiconductors show that the GGA systematically improves the predictive power of positron lifetime calculations over those based on the LDA. We compare also t...

    The role of partnerships in sustainable urban residential development

    This dissertation explores partnership-based urban residential development processes which aim towards achieving greater sustainability. Urban development is a complex phenomenon and involves a multitude of participants. Also, sustainability is a complex concept. The problem field, combining the two, is a real-life challenge which the research approaches with a pragmatic view. The primary investigation method of the study has been a multiple case study using both an action research case ...
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