Search results for "LM"
showing 10 items of 19289 documents
Lämpösähköisen materiaalin lämmönjohtavuuden määrittäminen matalissa lämpötiloissa käyttäen 3ω-menetelmää
2014
Työssä tutkittiin mittausmenetelmää lämmönjohtavuuden määrittämiseen mata- lissa lämpötiloissa. Mittaukset perustuivat 3ω menetelmään, joka on alunperin ohut- kalvoille kehitetty menetelmä lämmönjohtavuuden mittaukseen. Menetelmässä läm- mitinlangan läpi kulkeva vaihtovirta synnyttää kolminkertaisella taajudella olevan jännitteen, jonka avulla saadaan tietoa kappaleen termisistä ominaisuuksista. Mit- tauksissa kultainen lämmitinlanka höyrystettiin Kapton kalvon päälle ja tämän päälle hyvin ohut alumiinioksidikerros. Mittaukset suoritettiin pulssituubijäähdyttimeen ra- kennetussa näytteenpitimessä. Laitteiston toiminta varmistettiin huoneenlämpötilas- sa borosilikaatti- ja Kapton näytteillä.…
CCDC 1500639: Experimental Crystal Structure Determination
2017
Related Article: Rajendhraprasad Tatikonda, Kia Bertula, Nonappa, Sami Hietala, Kari Rissanen, Matti Haukka|2017|Dalton Trans.|46|2793|doi:10.1039/C6DT04253H
CCDC 831305: Experimental Crystal Structure Determination
2012
Related Article: M.Giese, M.Albrecht, G.Ivanova, A.Valkonen, K.Rissanen|2012|Supramol.Chem.|24|48|doi:10.1080/10610278.2011.622384
NEW 4-DIAZOPYRAZOLE DERIVATIVES AS POTENTIAL ANTIBIOFILM AGENTS
2010
Many infections such as otitis media, sinusitis, cholesteatoma, tonsillitis and adenoiditis are caused by biofilm forming mucosal pathogens (P. aeruginosa, S. aureus, S. peneomoniae, H. influenzae and M. catarrhalis). Moreover, the role of biofilms in the chronic otolaryngologic infections has been recognized for otitis media, tonsillitis and rhinosinusitis. Finally, bacterial biofilms of S. aureus, S. epidermis and E. faecalis are the leading cause of medical device-related infections. Pathogens growing as biofilms are intrinsically resistant to conventional antibiotics and therefore the discovery of new compounds able to act against biofilm aggregated micro organisms is an urgent task. Pr…
On the Almost Everywhere Convergence of Multiple Fourier-Haar Series
2019
The paper deals with the question of convergence of multiple Fourier-Haar series with partial sums taken over homothetic copies of a given convex bounded set $$W\subset\mathbb{R}_+^n$$ containing the intersection of some neighborhood of the origin with $$\mathbb{R}_+^n$$ . It is proved that for this type sets W with symmetric structure it is guaranteed almost everywhere convergence of Fourier-Haar series of any function from the class L(ln+L)n−1.
Soil moisture variations from boreal forests to the tundra
2023
Soil moisture has a profound influence on life on Earth, and this vital water resource varies across space and time. Here, we explored soil moisture variations in boreal forest and tundra environments, where comprehensive soil moisture datasets are scarce. We installed soil moisture sensors up to 14 cm depth at 503 measurement sites within seven study areas across northern Europe. We recorded 6,138,528 measurements to capture soil moisture variations of the snowless season from April to September 2020. We described the spatio-temporal patterns of soil moisture, and test how these patterns are linked to topography and how these links vary in space and time. We found large spatial variation a…
Magnetic dichroism in angle-resolved hard x-ray photoemission from buried layers
2011
This work reports the measurement of magnetic dichroism in angular-resolved photoemission from in-plane magnetized buried thin films. The high bulk sensitivity of hard x-ray photoelectron spectroscopy (HAXPES) in combination with circularly polarized radiation enables the investigation of the magnetic properties of buried layers. HAXPES experiments with an excitation energy of 8 keV were performed on exchange-biased magnetic layers covered by thin oxide films. Two types of structures were investigated with the IrMn exchange-biasing layer either above or below the ferromagnetic layer: one with a CoFe layer on top and another with a Co${}_{2}$FeAl layer buried beneath the IrMn layer. A pronou…
Exact Fourier expansion in cylindrical coordinates for the three-dimensional Helmholtz Green function
2009
A new method is presented for Fourier decomposition of the Helmholtz Green Function in cylindrical coordinates, which is equivalent to obtaining the solution of the Helmholtz equation for a general ring source. The Fourier coefficients of the Helmholtz Green function are split into their half advanced+half retarded and half advanced-half retarded components. Closed form solutions are given for these components in terms of a Horn function and a Kampe de Feriet function, respectively. The systems of partial differential equations associated with these two-dimensional hypergeometric functions are used to construct a fourth-order ordinary differential equation which both components satisfy. A s…
Preparation of polycrystalline TiO2 photocatalysts impregnated with various transition metal ions : characterization and photocatalytic activity for …
2002
A set of polycrystalline TiO2 photocatalysts loaded with various ions of transition metals (Co, Cr, Cu, Fe, Mo, V, and W) were prepared by using the wet impregnation method. The samples were characterized by using some bulk and surface techniques, namely X-ray diffraction, BET specific surface area determination, scanning electron microscopy, point of zero charge determination, and femtosecond pump-probe diffuse reflectance spectroscopy (PP-DRS). The samples were employed as catalysts for 4-nitrophenol photodegradation in aqueous suspension, used as a probe reaction. The characterization results have confirmed the difficulty to find a straightforward correlation between photoactivity and si…
Characterization of the Solid State Properties of Anodic Oxides on Magnetron Sputtered Ta, Nb and Ta-Nb Alloys
2012
Tantalum oxide, niobium oxide and Ta-Nb containing mixed oxides were grown by anodizing sputter-deposited Ta, Nb and Ta-Nb alloys of different compositions. A photoelectrochemical investigation was performed in order to estimate the band gap and the flat band potential of the oxides as a function of their composition. The band gap of the investigated Ta-Nb containing mixed oxides changed monotonically between those estimated for Ta2O5 (4.1 eV) and Nb2O5 (3.4 eV) and in agreement with a proposed correlation between the Band gap of an oxide and the difference of electronegativity of the oxide constituents. From the differential capacitance curves recorded in a wide range of electrode potentia…