Search results for "PIM"
showing 10 items of 3280 documents
Primordial dark matter from curvature induced symmetry breaking
2020
We demonstrate that adiabatic dark matter can be generated by gravity induced symmetry breaking during inflation. We study a $Z_2$ symmetric scalar singlet that couples to other fields only through gravity and for which the symmetry is broken by the spacetime curvature during inflation when the non-minimal coupling $\xi$ is negative. We find that the symmetry breaking leads to the formation of adiabatic dark matter with the observed abundance for the singlet mass $m\sim{\rm MeV}$ and $|\xi|\sim 1$.
Shining primordial black holes
2021
We study the well-motivated mixed dark matter (DM) scenario composed of a dominant thermal WIMP, highlighting the case of $SU(2)_L$ triplet fermion "winos", with a small fraction of primordial black holes (PBHs). After the wino kinetic decoupling, the DM particles are captured by PBHs leading to the presence of PBHs with dark minihalos in the Milky Way today. The strongest constraints for the wino DM come from the production of narrow line gamma rays from wino annihilation in the Galactic Center. We analyse in detail the viability of the mixed wino DM scenario, and determine the constraints on the fraction of DM in PBHs assuming a cored halo profile in the Milky Way. We show that already wi…
Despicable dark relics: generated by gravity with unconstrained masses
2019
We demonstrate the existence of a generic, efficient and purely gravitational channel producing a significant abundance of dark relics during reheating after the end of inflation. The mechanism is present for any inert scalar with the non-minimal curvature coupling $\xi R\chi^2$ and the relic production is efficient for natural values $\xi = {\cal O}(1)$. The observed dark matter abundance can be reached for a broad range of relic masses extending from $m \sim 1 {\rm k eV}$ to $m \sim 10^{8} {\rm GeV}$, depending on the scale of inflation and the dark sector couplings. Frustratingly, such relics escape direct, indirect and collider searches since no non-gravitational couplings to visible ma…
Knowledge Transfer Within Artisan Families in Early Nineteenth-Century Rural Finland
2019
In nineteenth‑century Finland, artisans constituted an important part of society, and the majority of them lived in the countryside. Rural artisans were jacks-of-all-trades who met the needs of country folk. This chapter studies the rural artisans’ children and explores how craft knowledge was often transferred to the next generation. In early modern society, it was only natural that the son followed his father’s trade. This was a matter of societal stability and maintaining the social order. It was also practical to invest in the children’s future by transferring the family’s craft knowledge and skills to the offspring, who would provide future care for the elders in turn. Nonetheless, not…
Refugee-background students negotiating academic literacy practices in L2: a dialogical and nexus analytical approach
2022
Tässä artikkelissa tarkastellaan pakolaistaustaisten opiskelijoiden osallistumista akateemisiin tekstikäytänteisiin toisella kielellä. Näillä opiskelijoilla oli myös aiempaa korkeakoulutusta. Ryhmä on jäänyt aiemmissa tutkimuksissa vähälle huomiolle. Tutkimuksen konteksti on uudenlainen korkeakoulutaustaisille maahanmuuttajille tarkoitettu koulutus, jossa yhdistyvät kieli- ja sisältöopinnot. Tutkin, miten kaksi avainosallistujaa ymmärtää ja ottaa haltuun suomenkielisen laskentatoimen kurssin tekstikäytänteitä osana koulutusta. Teoreettisesti ja metodologisesti tutkimus nojaa dialogiseen lähestymistapaan ja neksusanalyysin viitekehykseen. Ensisijainen aineisto koostui haastatteluista ja vide…
‘I don’t feel like I’m studying languages anymore’ : Exploring change in higher education students’ learner beliefs during multilingual language stud…
2022
To educate multilingual global citizens and follow the multilingual turn in language education, universities are faced with the challenge of developing their language pedagogies. This article reports on a study conducted in the context of university language studies that take a multilingual perspective to learning languages for academic and professional purposes. Although multilingual pedagogies have been widely developed in what could be traditionally considered as bilingual education, practical implementations are rarer when considering students that generally have one home language but study multiple foreign languages. To assess the effects of multilingual teaching in this kind of contex…
Cosmopolitan internationalism: UNESCO’s ideological ambiguity and the difference/diversity problematic
2022
This article addresses the ways in which UNESCO’s ideological engagements are negotiated in the difference/diversity discourse as they are transferred from the international standard-setting level to the national and local contexts. It proposes the discursive construction of cosmopolitan internationalism as a framework for analysing the intersections of difference, located in the practicalities of internationalism, and diversity, tied to the ideals of cosmopolitanism, as they are manifested at the level of both the implementation of UNESCO’s Diversity Convention and urban policy making in the city of Sydney. The analysis suggests that ruptures challenging the homogenising diversity discours…
Syntactic complexity in Finnish-background EFL learners’ writing at CEFR levels A1–B2
2022
Eurooppalaisen viitekehyksen (EVK) merkitys kielikoulutukselle on lisännyt tutkimusta sen taitotasojen kielellisistä piirteistä; tarkempi tieto näistä piirteistä auttaisi EVK:n soveltamista opetusmateriaalien, kurssien ja arviointin laatimiseen. Tutkimuksessa selvitettiin eroavatko EVK:n tasot toisistaan syntaksin kompleksisuuden perusteella. Suomalaiset 14- ja 17-vuotiaat englannin oppijat (N=379) kirjoittivat kolme kirjoitelmaa, jotka arvioitiin EVK:n taitotasoille. Arviointiaineisto tutkittiin monitahoisella Rasch-analyysillä ja tekstien piirteet selvitettiin automaattisilla analyysiohjelmilla. Tuloksien perusteella alimpia EVK-tasoja (A1–A2) erotti selvimmin toisistaan lauseiden ja T-yk…
Polish and Finnish teenagers’ motivation to learn English:the role of context
2016
Abstract Language learning motivation has been investigated in a number of contexts (Dornyei and Ushioda 2009). However, there has been only one attempt (Taguchi et al. 2009) at a systematic comparison of models of motivation to learn English by students from different countries. The aim of this study is to investigate the role of context by comparing motivational characteristics and SEM (Structural Equation Modelling) models of language learning motivation of 15-16 year-old students from Finland and Poland. The data from both countries was collected using the same motivational questionnaire with a total of 351 students completing it. A number of differences were identified between the two …
DGA detection using machine learning methods
2016
Yksi yleisimmistä kyberhyökkäysistä on käyttää ryhmä yksityisiä tietokoneita (private computers), joita käytetään esimerkiksi salaisien tietojen levittämiseen. Näitä koneryhmiä kutsutaan botnet. Botnetit pysyvät havaitsemattomana käyttämällä Domain Name Generation (DGA) menetelmää, joka luo ajoittain ja ratkaisee suurina lukumäärinä erillaisia pseudosatunnaisia verkkotunnuksia, kunnes jokin näistä pseudosatunnaisista verkkotunnuksista DNS palvelin hyväksyy. Tämän tutkielman tarkoitus on kehitellä ei- ohjattuja koneoppimismenetelmiä ja vertailla näiden tarkkuutta ohjattuihin koneoppimismenetelmiin DGA hyökkäyksien havaitsemiseen. Lisäksi, tutkielmassa esitellään Random One Class Support Vect…