Diffusion of Be, Co and Mn impurities in compound semiconductors and glassy carbon studied by the modified radiotracer technique

The main method of modifying properties of semiconductors is to introduce small amount of impurities inside the material. This is used to control magnetic and optical properties of materials and to realize p- and n-type semiconductors out of intrinsic material in order to manufacture fundamental components such as diodes. As diffusion can be described as random mixing of material due to thermal movement of atoms, it is essential to know the diffusion behavior of the impurities in order to manufacture working components. In modified radiotracer technique diffusion is studied using radioactive isotopes of elements as tracers. The technique is called modified as atoms are deployed inside the material by ion beam implantation. With ion implantation, a distinct distribution of impurities can be deployed inside the sample surface with good con- trol over the amount of implanted atoms. As electromagnetic radiation and other nuclear decay products emitted by radioactive materials can be easily detected, only very low amount of impurities can be used. This makes it possible to study diffusion in pure materials without essentially modifying the initial properties by doping. In this thesis a modified radiotracer technique is used to study the diffusion of beryllium in GaN, ZnO, SiGe and glassy carbon. GaN, ZnO and SiGe are of great interest to the semiconductor industry and beryllium as a small and possibly rapid dopant hasn t been studied previously using the technique. Glassy carbon has been added to demonstrate the feasibility of the technique. In addition, the diffusion of magnetic impurities, Mn and Co, has been studied in GaAs and ZnO (respectively) with spintronic applications in mind.

The Context and Diffusion of Knowledge in the Finnish Jewellery Industry - The role of the House of Fabergé

Researchers within the fields of economic geography and organizational management have extensively studied learning and the prerequisites and impediments for knowledge transfer. This paper combines two discourses within the two subjects: the-communities-of-practice and the learning region approaches, merging them through the so-called ecology of knowledge-approach, which is used to examine the knowledge transfer from the House of Fabergé to the Finnish jewellery industry. We examine the pre-revolution St Petersburg jewellery cluster and the post-revolution Helsinki, and the transfer of knowledge between these two locations through the components of communities of people, institutions and industry. The paper shows that the industrial dynamics of the Finnish modern-day goldsmith industry was inherently shaped both through the transfer and the non-transfer of knowledge. It also contends that the “knowledge-economy” is not anchored in and exclusive for the high technology sector of the late 20th century.

Kummimaatilatoiminta opettajien ja maatilojen sekä innovaatiotutkimuksen näkökulmista

Tutkimuksen tarkoituksena on selvittää Finfood - Suomen Ruokatieto ry:n alullepanemassa kummimaatilatoiminnassa mukana olleiden opettajien ja maatilojen käsityksiä ja kokemuksia toiminnasta sekä tarkastella kummimaatilatoimintaa innovaationa. Kummimaatilatoiminta liittyy Finfoodin internetissä julkaisemaan oppimateriaaliin suomalaisen ruoan tiestä. Kummimaatilatoiminnan tavoitteena on, että mahdollisimman monella peruskoululuokalla olisi oma kummimaatila, missä luokka voisi vierailla vuosittain, joka säilyisi luokalla mahdollisimman pitkään ja jonka kanssa luokka suunnittelee oman yhteistyönsä. Kummimaatilatoiminnan avulla pyritään omakohtaisten kokemusten ja elämysten kautta lisäämään nuorten tietoa maaseudun elämästä. Tutkimuksen tausta -osassa tarkastellaan koulun ja yhteiskunnan muiden tahojen yhteistyötä, esitellään tutkimuksia koulun ja teollisuusyritysten yhteistyöstä sekä koulun ja maatalouden yhteistyöhön liittyvää materiaalia. Lisäksi tarkastellaan innovaatiota ja innovaation diffuusiota. Koska kummimaatilatoiminta on uusi toimintamuoto, jossa toisena osapuolena on koulu, tutkimuksessa käsitellään myös kasvatuksen muutoksia (educational change). Tutkimusta käsitellään tapaus- ja toimintatutkimuksena. Tutkimusaineistona ovat kummimaatilatoiminnan alkuvaiheessa syksyllä 1997 mukaan lähteneiden seitsemän opettajan ja kuuden maatilan teemahaastattelut. Tutkimuksessa on haastateltu myös Finfoodin edustajaa. Aineisto kerättiin kevään ja syksyn 1998 aikana. Innovaatiotarkastelun pohjana ovat lisäksi tutkijan omat kokemukset toiminnasta sekä erilaiset kokoukset ja keskustelut. Opettajien ja maatilojen kokemuksista selvitettiin heidän toiminnan aloittamiseen johtaneita motiivejaan, toiminnalle asettamiaan tavoitteita, toiminnassa havaitsemiaan ongelmia sekä käsityksiä toiminnan onnistumisen avaintekijöistä ja toiminnan kehittämisestä. Suuria näkemyseroja ei opettajien ja maatilojen kokemusten välillä ollut. Osapuolet pitivät maaseutua tärkeänä ja halusivat tarjota lapsille kokemuksia elämästä siellä. Yhteisenä tavoitteena opettajilla ja maatiloilla oli, että toiminta olisi mahdollisimman laajaa, ei pelkkiä retkipäiviä maalle. Opettajat korostivat myös vierailujen toiminnallisuutta. Maatilat toivoivat voivansa lisätä toiminnalla myös omaa tietämystään ja ammattitaitoaan. Käytännön asiat kuten matkat olivat eniten ongelmia aiheuttaneita asioita. Muina mahdollisina ongelmina mainittiin asenteet ja tiedotus. Toiminnan avaintekijöinä pidettiin suunnittelua, molempien osapuolten motivoituneisuutta ja aktiivisuutta, vierailujen toiminnallisuutta, tiedottamista ja toiminnan laajentamista. Kehittämisideat liittyivät toiminnan laajentamiseen ja monipuolistamiseen. Tämän tutkimuksen perusteella kummimaatilatoimintaa on ryhdytty kehittämään niin, että koko koululla yksittäisen luokan sijaan on yhteinen kummimaatila. Innovaatiotarkastelu osoitti, että kummimaatilatoiminnan kehittäminen ja levittäminen on pitkä prosessi, jossa koordinaattorin rooli on tärkeä. Osallistujien sitoutuminen toimintaan, osallistujien tukeminen sekä heidän kokemustensa hyödyntäminen on myös tärkeää. Tärkeimmät lähteet tutkimuksen taustateorian kannalta olivat Rogersin, Fullanin ja Hargreavesin teokset. Avainsanat: kummimaatilatoiminta, innovaatio, innovaation diffuusio, muutos Keywords: godfarms, farm visits, innovation, diffusion of innovation, educational change

Kehittämistutkimus: Tieto- ja viestintätekniikkaa kemian opetukseen

The main aim of the present study was to develop information and communication technology (ICT) based chemistry education. The goals for the study were to support meaningful chemistry learning, research-based teaching and diffusion of ICT innovations. These goals were used as guidelines that form the theoretical framework for this study. This Doctoral Dissertation is based on eight-stage research project that included three design researches. These three design researches were scrutinized as separate case studies in which the different cases were formed according to different design teams: i) one researcher was in charge of the design and teachers were involved in the research process, ii) a research group was in charge of the design and students were involved in the research process, and iii) the design was done by student teams, the research was done collaboratively, and the design process was coordinated by a researcher. The research projects were conducted using mixed method approach, which enabled a comprehensive view on education design. In addition, the three central areas of design research: problem analysis, design solution and design process were included in the research, which was guided by the main research questions formed according to these central areas: 1) design solution: what kind of elements are included in ICT-based learning environments that support meaningful chemistry learning and diffusion of innovation, 2) problem analysis: what kind of new possibilities the designed learning environments offer for the support of meaningful chemistry learning, and 3) design process: what kind of opportunities and challenges does collaboration bring to the design of ICT-based learning environments? The main research questions were answered according to the analysis of the survey and observation data, six designed learning environments and ten design narratives from the three case studies. Altogether 139 chemistry teachers and teacher students were involved in the design processes. The data was mainly analysed by methods of qualitative content analysis. The first main result from the study give new information on the meaningful chemistry learning and the elements of ICT-based learning environment that support the diffusion of innovation, which can help in the development of future ICT-education design. When the designed learning environment was examined in the context of chemistry education, it was evident that an ICT-based chemistry learning environment supporting the meaningful learning of chemistry motivates the students and makes the teacher s work easier. In addition, it should enable the simultaneous fulfilment of several pedagogical goals and activate higher-level cognitive processes. The learning environment supporting the diffusion of ICT innovation is suitable for Finnish school environment, based on open source code, and easy to use with quality chemistry content. According to the second main result, new information was acquired about the possibilities of ICT-based learning environments in supporting meaningful chemistry learning. This will help in setting the goals for future ICT education. After the analysis of design solutions and their evaluations, it can be said that ICT enables the recognition of all elements that define learning environments (i.e. didactic, physical, technological and social elements). The research particularly demonstrates the significance of ICT in supporting students motivation and higher-level cognitive processes as well as versatile visualization resources for chemistry that ICT makes possible. In addition, research-based teaching method supports well the diffusion of studied innovation on individual level. The third main result brought out new information on the significance of collaboration in design research, which guides the design of ICT education development. According to the analysis of design narratives, it can be said that collaboration is important in the execution of scientifically reliable design research. It enables comprehensive requirement analysis and multifaceted development, which improves the reliability and validity of the research. At the same time, it sets reliability challenges by complicating documenting and coordination, for example. In addition, a new method for design research was developed. Its aim is to support the execution of complicated collaborative design projects. To increase the reliability and validity of the research, a model theory was used. It enables time-pound documenting and visualization of design decisions that clarify the process. This improves the reliability of the research. The validity of the research is improved by requirement definition through models. This way learning environments that meet the design goals can be constructed. The designed method can be used in education development from comprehensive to higher level. It can be used to recognize the needs of different interest groups and individuals with regard to processes, technology and substance knowledge as well as interfaces and relations between them. The developed method has also commercial potential. It is used to design learning environments for national and international market.

The Networks of Learning in Technological Innovation : The Emergence of Collaboration Across Fields of Expertise

This study addresses four issues concerning technological product innovations. First, the nature of the very early phases or "embryonic stages" of technological innovation is addressed. Second, this study analyzes why and by what means people initiate innovation processes outside the technological community and the field of expertise of the established industry. In other words, this study addresses the initiation of innovation that occurs without the expertise of established organizations, such as technology firms, professional societies and research institutes operating in the technological field under consideration. Third, the significance of interorganizational learning processes for technological innovation is dealt with. Fourth, this consideration is supplemented by considering how network collaboration and learning change when formalized product development work and the commercialization of innovation advance. These issues are addressed through the empirical analysis of the following three product innovations: Benecol margarine, the Nordic Mobile Telephone system (NMT) and the ProWellness Diabetes Management System (PDMS). This study utilizes the theoretical insights of cultural-historical activity theory on the development of human activities and learning. Activity-theoretical conceptualizations are used in the critical assessment and advancement of the concept of networks of learning. This concept was originally proposed by the research group of organizational scientist Walter Powell. A network of learning refers to the interorganizational collaboration that pools resources, ideas and know-how without market-based or hierarchical relations. The concept of an activity system is used in defining the nodes of the networks of learning. Network collaboration and learning are analyzed with regard to the shared object of development work. According to this study, enduring dilemmas and tensions in activity explain the participants' motives for carrying out actions that lead to novel product concepts in the early phases of technological innovation. These actions comprise the initiation of development work outside the relevant fields of expertise and collaboration and learning across fields of expertise in the absence of market-based or hierarchical relations. These networks of learning are fragile and impermanent. This study suggests that the significance of networks of learning across fields of expertise becomes more and more crucial for innovation activities.