Search results for "rake"

Jyväskyläläisten etänaismetsänomistajien luontosuhde ja metsänomistajuus

2018

Kaupunkilaisten, naisten, korkeakoulutettujen, palkansaajien ja nuorten osuus metsänomistajista tulee kasvamaan seuraavien vuosikymmenten aikana. Täten myös metsänomistajien suhde luontoon ja metsäomaisuuteensa saattaa muuttua. Muutoksesta ja etenkin sen vaikutuksesta puunmyyntiin on toisinaan esitetty huolestuneita lausuntoja metsätalouden sekä metsätutkimuksen piirissä. Tutkielman tarkoituksena oli kartoittaa etänaismetsänomistajien luontoon ja metsän omistamiseen liittämiä merkityksiä, sekä sitä, kuinka nämä merkitykset ovat syntyneet ja kuinka ne näkyvät metsänomistajuudessa. Etänaismetsänomistajat toimivat esimerkkinä muutoksessa olevasta metsänomistajakunnasta. Käytännössä tutkielmass…

Evolution of the microstructure of sputter deposited TaAlON thin films with increasing oxygen partial pressure

2021

Recently, quaternary oxynitrides of transition metals and aluminum have attracted increasing interest due to their tunable properties. Within the present work, a series of TaAl(O)N films was sputter deposited using constant nitrogen and varying oxygen partial pressures. The films were grown from single element Ta and Al targets. The deposition parameters were adjusted to obtain a Ta/Al atomic ratio of ~50/50 for the oxygen-free film and were held constant for the following depositions, with the exception of the increasing oxygen partial pressure and compensatory decreasing argon partial pressure. Elastic recoil detection analysis revealed oxygen contents of up to ~26 at.%, while the nitroge…

Fractal-like Hierarchical CuO Nano/Microstructures for Large-Surface-to-Volume-Ratio Dip Catalysts

2022

Dip catalysts are attracting interest in both academia and industry for catalyzing important chemical reactions. These provide excellent stability, better recoverability, recyclability, and easy scale-up. Using the unique microstructures of leaf skeletons, we present a fractal-like hierarchical surface that can be used as a versatile and efficient dip catalyst. Copper oxide microcactuses with nanoscalar features were fabricated onto the Bauhinia racemosa leaf skeletons via a combination of physical vapor deposition, electroplating, and chemical oxidation methods. The coated leaf skeletons have a very high surface area, and the three-dimensional (3D) morphology allows the reactants to encoun…

The microstructure of bentonite clay

2018

Bentonite is a common clay having many applications. One of them will be in the spent nuclear fuel repository, as a buffer material between host rock and the canisters containing the radioactive waste. This application has high requirements for the material used, ranging from, among others, appropriate mechanical properties, chemical stability, fine porous structure to sufficient hydraulic conductivity. The material should maintain its properties over time as the life span of the repository is hundreds of thousands years. The aim of this thesis was to investigate the structure of bentonite clay in a condition similar to expected in the repository. The research focused mainly on the pore str…

Morphological analysis of human cortical bone using high-resolution X-ray microtomography

2012

Structural and elastic properties of bone are related to microstructural parameters such as porosity and anisotropy. Microtomography (μCT) enables assessment of bone microstructural geometry, typically down to a voxel size of 5 microns. The purpose of this thesis was to evaluate whether using a higher (sub-micrometer) voxel resolution in X-ray μCT enables detection of new, finer, details in human cortical bone. The second objective was to measure several morphological parameters that determine the microstructure, and to compare two different microtomographs. To this end, twenty four human cadaveric femur samples were imaged by Xradia XCT-400 at a voxel size of 0.56 - 0.59 μm and spatial res…

Synthesis of self-assembled mesoporous 3D In2O3 hierarchical micro flowers composed of nanosheets and their electrochemical properties

2018

This report describes the methodology for the fabrication of mesoporous In2O3 microflowers by hydrothermal and calcination procedures in which In(OH)3/In2S3 acts as an intermediate. Both In2O3 and its precursor were analyzed with scanning electron microscopy, energy dispersive X-ray spectrophotometry, transmission electron microscopy and powder X-ray diffraction. BET surface area, pore size and pore volume analyses were also carried out. Electron microscopy images clearly evidence the self-assembly of 2D nanosheets into the micro flower structure. The mechanism of self-assembly and calcination is reported. Electrochemical properties of the synthesized In2O3 micro flowers were studied. peerR…

Influence of B content on microstructure, phase composition and mechanical properties of CVD Ti(B,N) coatings

2022

Within this work the effect of the B content on the microstructure, phase composition and mechanical properties of CVD Ti(B,N) coatings is investigated. Ti(B,N) coatings with B contents from 0 (fcc-TiN) to ∼5, ∼15, ∼30, ∼45 and 66 (h-TiB2) at.% have been deposited by CVD. The elemental composition of the coatings was confirmed by ERDA and their microstructure was investigated using XRD and SEM. With increasing B content, a transition from a fcc to a h-dominated structure via dual-phase fcc/h-Ti(B,N) was observed, which was accompanied by a decreasing grain size from the µm to nm range. Combinatorial use of Raman spectroscopy, XPS and APT measurements indicated B-rich grain boundary segregat…

Olipa kerran puutalokaupunki

2017

Kirja-arvio teoksesta Jäppinen, Jussi: Kadonnutta kaupunkia etsimässä. Tarinoita Jyväskylän puretuista taloista. Atena Kustannus Oy, 2017. 272 sivua. ISBN 978-952-300-300-2. Jussi Jäppisen Kadonnutta kaupunkia etsimässäon monella tavalla ajankohtainen historiateos: kirja palkittiin Vuoden kotiseututeoksena, se käsittelee kaupunkihistoriaa ja hyödyntää kuvaa historiantutkimuksen lähteenä. Se täydentääkin komeasti Jäppisen Jyväskylä-aiheisten teosten sarjaa. Näyttävä kahvipöytäkirja toimii parhaiten juuri sellaisena – selailukirjana tai hakuteoksena. Kannesta kanteen luettuna kirja voi käydä paikoitellen raskaaksi. nonPeerReviewed

Alvar Aallon suunnitelma Riolan kirkoksi : sijoittuminen ja suhde maisemaan

2003

Arkkitehtuurin poliittinen tiedostamaton

2021

Martin Heidegger’s ”Building Dwelling Thinking” argues that socially engaged architecture fails to understand that the crisis of housing is related to more profound crisis of being. To fully grasp this, architecture needs to be detached from direct social and political questions. Instead architecture needs to examine and elaborate, how dwelling and being are related. Situated however to the actual reconstruction period after the wwii, the statement has its own ideological purpose. By looking this from the point of view of the political unconscious of architecture, the article proposes that Heidegger’s philosophical reflections are deliberately targeted against the political project of moder…