Search results for "materiaalit"

Hyvän oppimateriaalin jäljillä - opettajaharjoittelijan tutkimusmatka ammattikorkeakoulun kieliopintojen oppimateriaaleihin

2010

Artikkelissa vieraiden kielten aineenopettajaksi opiskeleva kirjoittaja tekee tutkimusmatkan ammattikorkeakoulun kieliopintojen oppimateriaaleihin. Tekstissä perehdytään hyvän oppimateriaalin kriteereihin yhtäältä ammattikorkeakoulun opiskelijan näkökulmasta ja toisaalta häntä opettavan kieltenopettajan näkökulmasta. nonPeerReviewed

Inspired by nature: Fiber networks functionalized with tannic acid and condensed tannin-rich extracts of Norway spruce bark show antimicrobial effica…

2023

This study demonstrated the antibacterial and antiviral potential of condensed tannins and tannic acid when incorporated into fiber networks tested for functional material purposes. Condensed tannins were extracted from industrial bark of Norway spruce by using pressurized hot water extraction (PHWE), followed by purification of extracts by using XADHP7 treatment to obtain sugar-free extract. The chemical composition of the extracts was analyzed by using HPLC, GC‒MS and UHPLC after thiolytic degradation. The test matrices, i.e., lignocellulosic handsheets, were produced and impregnated with tannin-rich extracts, and tannic acid was used as a commercial reference. The antibacterial and antiv…

Ca-P-O thin film preparation, modification and characterisation

2011

Bioceramics are biocompatible ceramic materials, that interact with biological systems of the body to treat, strengthen or replace body functions. Most conventional bioceramics are oxide ceramics, glass ceramics and calcium phosphate ceramics. Among these calcium phosphates, synthetic hydroxyapatite has been extensively studied due to its biomimetic properties similar to that of natural bone. One approach to prepare synthetic hydroxyapatite is to first deposit amorphous Ca-P-O thin film and then by means of post deposition annealing initiate the formation of hydroxyapatite crystals to the film. In addition to the correct film composition and crystalline structure, other surface properties s…

Why Open Educational Resources Repositories fail - Review of Quality Assurance Approaches

2014

Regardless of the amount of open educational resources (OER) available, many learning object repositories LORs fail to attract active users and sustainable funding solutions. Previous studies indicate that quality of OER plays a significant role in the success of the repositories; however, there is a lack of systematic deeper understanding of this connection. In this qualitative study we interviewed 35 managers/developers of 27 national, thematic and federated LORs in regards of the LORs’ quality approaches and success. The key findings of this study show that comprehensive quality approach leads to success of the repository in most cases, the key instruments for quality assurance being exp…

Trusted educational networks for the internationalization of open educational resources

2013

Global educational programs have become increasingly important in Higher Education and the training sector. One promising means of global collaboration is the use of Open Educational Resources (OERs). However, this opportunity has been slow to catch on, even though millions of learning objects are freely available around the world. This paper discusses key barriers to the use of OERs, and gives recommendations for better use of materials in international collaborations. A special focus is on the development of Trusted Educational Networks, and their use within recommendation mechanisms to enhance sharing in communities of trusted colleagues. peerReviewed

Barriers to open e-learning in public administrations

2017

The use of Open Educational Resources (OERs) is promising as a complementary resource to traditional e-learning courses. Digital learning resources can be accessed on demand and can be developed by a wide range of employees. Thus, OERs may be suitable as a response to the changing demands of workplace learning. Despite its potential, the uptake of OER is slow. Previous research has found numerous barriers to the use and sharing of OERs, ranging from cultural to technical and organizational challenges. Research has reported barrier concepts, which elaborate on the kinds and meanings of challenges in the educational and private sector domain. Yet, it remains unclear as to why and how barriers…

Resolving Bio-Nano Interactions of E.coli Bacteria-Dragonfly Wing Interface with Helium Ion and 3D-Structured Illumination Microscopy to Understand B…

2020

Obtaining a comprehensive understanding of the bactericidal mechanisms of natural nanotextured surfaces is crucial for the development of fabricated nanotextured surfaces with efficient bactericidal activity. However, the scale, nature, and speed of bacteria-nanotextured surface interactions make the characterization of the interaction a challenging task. There are currently several different opinions regarding the possible mechanisms by which bacterial membrane damage occurs upon interacting with nanotextured surfaces. Advanced imaging methods could clarify this by enabling visualization of the interaction. Charged particle microscopes can achieve the required nanoscale resolution but are …

Aqueous foam as the carrier phase in the deposition of fibre networks

2015

Computational and theoretical studies on lattice thermal conductivity and thermal properties of silicon clathrates

2016

The lattice thermal conductivity is usually an intrinsic property in the study of thermoelectricity. In particular, relatively low lattice thermal conductivity is usually a desired feature when higher thermoelectric efficiency is pursued. The mechanisms which lower the lattice thermal conductivity are not known in sufficient detail and deeper understanding about the phenomena is needed and if such understanding is achieved it can be used to design more efficient thermoelectric materials. In this thesis, the lattice thermal conductivity and other thermal properties of several silicon clathrates, which are known to be promising candidates for the thermoelectric applications, are studied by theoreti…

Preparation of potentially porous, chiral organometallic materials through spontaneous resolution of pincer palladium conformers.

2013

Understanding the mechanism by which advanced materials assemble is essential for the design of new materials with desired properties. Here, we report a method to form chiral, potentially porous materials through spontaneous resolution of conformers of a PCP pincer palladium complex ({2,6-bis[(di-t-butylphosphino)methyl]phenyl}palladium(II)halide). The crystallisation is controlled by weak hydrogen bonding giving rise to chiral qtz-nets and channel structures, as shown by 16 such crystal structures for X = Cl and Br with various solvents like pentane and bromobutane. The fourth ligand (in addition to the pincer ligand) on palladium plays a crucial role; the chloride and the bromide primaril…