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  • 1351.
    af Petersens, Lovisa
    et al.
    Stockholm University, Faculty of Humanities, Department of History.
    Jonsson, Pernilla
    Uppsala universitet.
    Resources and Swedish women's organizations: Participation on the international scene 1885-19162007In: Politische netzwerkerinnen: Internationale zusammenarbeit von frauen 1830-1960, Trafo verlag, Berlin , 2007, p. 229-248Chapter in book (Other academic)
  • 1352.
    Af Robson, Ida
    et al.
    Stockholm University, Faculty of Social Sciences, School of Business.
    Wikström, Nicklas
    Stockholm University, Faculty of Social Sciences, School of Business.
    Om filmen som projekt : En studie ur ett traditionellt och modernt projektperspektiv2002Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Sammanfattning saknas.

  • 1353.
    Af Robson, Ida
    et al.
    Stockholm University, Faculty of Social Sciences, School of Business.
    Wikström, Nicklas
    Stockholm University, Faculty of Social Sciences, School of Business.
    Poet och general: En studie av ledarskap och management vid filmskapande2003Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Sammanfattning saknas.

  • 1354.
    Af Sandeberg, Carl-Fredrik
    et al.
    Stockholm University, Faculty of Social Sciences, School of Business.
    Östlund, Johan
    Stockholm University, Faculty of Social Sciences, School of Business.
    Ingredient co-branding of private labels: From a consumer derived management perspective2003Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This dissertation concerns ingredient co-branding of private labels from a consumer derived management perspective. Specifically, the research question was: how could manufacturers use ingredient co-branding to launch private labels with retailers?

  • 1355.
    af Sandeberg, Catarina
    Stockholm University, Faculty of Law, Department of Law.
    Prospektansvaret: caveat emptor eller caveat venditor?2001Doctoral thesis, monograph (Other academic)
  • 1356.
    af Sandeberg, Susanne
    Stockholm University, Faculty of Humanities, Department of Linguistics.
    Engelskundervisningens betydelse för elever med dyslexi2010Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Studien belyser och diskuterar hur undervisning i engelska inom grundskola och gymnasium samt antagningsregler till högskola kan påverka möjligheten att utbilda sig i tekniska ämnen för personer med dyslexi. Studien belyser att det finns en hel del som tyder på att undervisningen i engelska i grundskola och gymnasium ofta inte är anpassad till de elever som har fonologiska svårigheter, och att detta kan få avgörande betydelse för deras framtid.

    I en första delstudie görs en enkätundersökning bland engelsklärare i grundskola och gymnasium för att se om de har goda möjligheter att undervisa elever med dyslexi. Undersökningen visar bland annat att det har funnits brister på lärarhögskolor när det gäller utbildningen om läs- och skrivsvårigheter/dyslexi.

    81 % av de 33 lärare som har engelska i sin utbildning svarar att de inte har fått kunskap om läs- och skrivsvårigheter/dyslexi som hjälper dem i undervisningen i engelska. Undersökningen visar också att flera kommuner inte ger lärarna den fortbildning de behöver och att många lärare upplever en vardag med tidsbrist, för få alternativa verktyg och för stora undervisningsgrupper.

    I en andra delstudie belyses framgångsfaktorer i engelska för elever med dyslexi. Fyra högskolestudenter som har dyslexi djupintervjuas, samtliga går fjärde året på utbildningen till civilingenjör. Två av studenterna har MVG i engelska B från gymnasiet och två har inte läst engelska B.

    I en tredje studie görs en jämförelse mellan gymnasiebetygen i engelska för 30 studenter med dyslexi på civilingenjörsprogrammet och en kontrollgrupp. Studien visar bland annat att det är 10 % av dyslektikerna som inte skulle ha kommit in på utbildningen på grundval av sina betyg om de hade sökt hösten 2010 när det är nya antagningsregler med högre språkkrav.

  • 1357.
    af Ugglas Åberg, Rebecca
    et al.
    Stockholm University, Faculty of Humanities, Department of Journalism, Media and Communication (JMK).
    Åkesdotter, Sofia
    Stockholm University, Faculty of Humanities, Department of Journalism, Media and Communication (JMK).
    Twitter som källa?: En totalundersökning av synliga källor i nyhetsartiklar under revolutionen i Egypten 20112011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Undersökningen syftar till att med kvantitativ innehållsanalys besvara frågeställningarna: Vilka synliga källor förkommer i den svenska nyhetsrapporteringen? Hur ser fördelningen mellan de undersökta källorna ut? I vilken utsträckning används sociala medier som källa?

    Uppsatsen bygger på en explorativ totalundersökning av samtliga källor förekommande under den svenska nyhetsrapporteringen om revolutionen i Egypten under perioden 2011-01-26 – 2011-02-12. Materialet består av nyhetsartiklar från Sveriges sex största nyhetstidningar (Aftonbladet, Dagens Nyheter, Expressen, Göteborgs-Posten, Svenska Dagbladet och Sydsvenskan).

    Teoretiska utgångspunkter är teoribildningar runt journalistikens roll i samhället, demokrati och källteori.

    Resultaten visar på att Twitter och de sociala medierna har slagit igenom som kanal för nyhetskällor i Sverige och i än större utsträckning används dessa kanaler som omvärldsbevakningsverktyg av journalister. De undersökta nyhetstidningarna har sammanslaget använt Twitter som primärkälla vid tolv tillfällen.  

  • 1358. Afewerki, Samson
    et al.
    Alimohammadzadeh, Rana
    Osong, Sinke H.
    Tai, Cheuk-Wai
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Engstrand, Per
    Córdova, Armando
    Sustainable Design for the Direct Fabrication and Highly Versatile Functionalization of Nanocelluloses2017In: Global Challenges, ISSN 2056-6646, Vol. 1, no 7, article id 1700045Article in journal (Refereed)
    Abstract [en]

    This study describes a novel sustainable concept for the scalable direct fabrication and functionalization of nanocellulose from wood pulp with reduced energy consumption. A central concept is the use of metal-free small organic molecules as mediators and catalysts for the production and subsequent versatile surface engineering of the cellulosic nanomaterials via organocatalysis and click chemistry. Here, organoclick chemistry enables the selective functionalization of nanocelluloses with different organic molecules as well as the binding of palladium ions or nanoparticles. The nanocellulosic material is also shown to function as a sustainable support for heterogeneous catalysis in modern organic synthesis (e.g., Suzuki cross-coupling transformations in water). The reported strategy not only addresses obstacles and challenges for the future utilization of nanocellulose (e.g., low moisture resistance, the need for green chemistry, and energy-intensive production) but also enables new applications for nanocellulosic materials in different areas.

  • 1359. Afewerki, Samson
    et al.
    Breistein, Palle
    Deiana, Luca
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Dziedzic, Pawel
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Ibrahem, Ismail
    Córdova, Armando
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Catalytic enantioselective β -alkylation of α,β-unsaturated aldehydes by combination of transition-metal- and aminocatalysis: Total synthesis of bisabolane sesquiterpenes2011In: Chemistry: a European Journal, ISSN 0947-6539, Vol. 17, no 32, p. 8784-8788Article in journal (Refereed)
  • 1360.
    Afewerki, Samson
    et al.
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Mid Sweden University, Sweden.
    Córdova, Armando
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Mid Sweden University, Sweden.
    Combinations of Aminocatalysts and Metal Catalysts: A Powerful Cooperative Approach in Selective Organic Synthesis2016In: Chemical Reviews, ISSN 0009-2665, E-ISSN 1520-6890, Vol. 116, no 22, p. 13512-13570Article, review/survey (Refereed)
    Abstract [en]

    The cooperation and interplay between organic and metal catalyst Arninocatalysis systems is of utmost importance in nature and chemical synthesis. Here innovative and selective cooperative catalyst systems can be designed by combining two catalysts that complement rather than inhibit one another. This refined strategy can permit chemical transformations unmanageable by either of the catalysts alone. This review summarizes innovations and developments in selective organic synthesis that have used cooperative dual catalysis by combining simple aminocatalysts with metal catalysts. Considerable efforts have been devoted to this fruitful field. This emerging area employs the different activation modes of amine and metal catalysts as a platform to address challenging reactions. Here, aminocatalysis (e.g., enamine activation catalysis, iminium activation catalysis, single occupied molecular orbital (SOMO) activation catalysis, and photoredox activation catalysis) is employed to activate unreactive carbonyl substrates. The transition metal catalyst complements by activating a variety of substrates through a range of interactions (e.g., electrophilic pi-allyl complex formation, Lewis acid activation, allenylidene complex formation, photoredox activation, C-H activation, etc.), and thereby novel concepts within catalysis are created. The inclusion of heterogeneous catalysis strategies allows for green chemistry development, catalyst recyclability, and the more eco-friendly synthesis of valuable compounds.

  • 1361. Afewerki, Samson
    et al.
    Ibrahem, Ismail
    Rydfjord, Jonas
    Breistein, Palle
    Córdova, Armando
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Direct Regiospecific and Highly Enantioselective Intermolecular α-Allylic Alkylation of Aldehydes by a Combination of Transition-Metal and Chiral Amine Catalysts2012In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 18, no 10, p. 2972-2977Article in journal (Refereed)
    Abstract [en]

    The first direct intermolecular regiospecific and highly enantioselective a-allylic alkylation of linear aldehydes by a combination of achiral bench-stable Pd0 complexes and simple chiral amines as co-catalysts is disclosed. The co-catalytic asymmetric chemoselective and regiospecific a-allylic alkylation reaction is linked in tandem with in situ reduction to give the corresponding 2-alkyl alcohols with high enantiomeric ratios (up to 98:2 e.r.; e.r.=enantiomeric ratio). It is also an expeditious entry to valuable 2-alkyl substituted hemiacetals, 2-alkyl-butane-1,4-diols, and amines. The concise co-catalytic asymmetric total syntheses of biologically active natural products (e.g., Arundic acid) are disclosed.

  • 1362.
    Afewerki, Samson
    et al.
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Mid-Sweden University, Sweden.
    Ma, Guangning
    Ibrahem, Ismail
    Liu, Leifeng
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Sun, Junliang
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
    Córdova, Armando
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Mid-Sweden University, Sweden.
    Highly Enantioselective Control of Dynamic Cascade Transformations by Dual Catalysis: Asymmetric Synthesis of Polysubstituted Spirocyclic Oxindoles2015In: ACS Catalysis, ISSN 2155-5435, E-ISSN 2155-5435, Vol. 5, no 2, p. 1266-1272Article in journal (Refereed)
    Abstract [en]

    The highly enantioselective (up to >99.5:0.5 er) synthesis of polysubstituted spirocyclic oxindoles with four new contiguous stereocenters, including the spiro all-carbon quaternary center, is disclosed. It is accomplished by the highly stereoselective control of a dynamic conjugate/intramolecular allylic alkylation relay sequence based on the synergistic cooperation of metal and chiral amine catalysts in which the careful selection of organic Nand, metal complex, and chiral amine is essential. The intermolecular C-C bond-forming step occurred only when both the metal and chiral amine catalysts were present.

  • 1363.
    Afkhami, Avid
    et al.
    Stockholm University, Faculty of Social Sciences, School of Business.
    Lundre, Mikael
    Stockholm University, Faculty of Social Sciences, School of Business.
    Spelcommunity: En undersökning av datorspelskonsumtion2003Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Vårt konsumtionssamhälle kan idag sägas vara på väg att förändras, till stor del som en konsekvens av att datorn gjort sitt intåg i våra liv och hem. Vi har fått möjlighet att upptäcka nya och snabbare sätt att kommunicera och roa oss på. Via nätverk och på Internet kan konsumenter med gemensamma intressen mötas och utbyta erfarenheter utan att vara geografiskt begränsade. Med den tekno-logiska utvecklingen har vi fått datorspelet, en ytterligare produkt vi kan konsumera. Individen kan idag kommunicera och interagera med andra konsumenter via datorspel som kan spelas av flera på Internet eller via andra typer av nätverk. Syftet med uppsatsen är att försöka förstå den sociala innebörd och funktion som konsumtion av datorspel har för användaren. Vår forskningsfråga lyder:

  • 1364.
    Afram, Mirna
    Stockholm University, Faculty of Social Sciences, Department of Special Education.
    Lärares erfarenheter av elevsamarbete och samlära på gymnasiesärskolans individuella program: En studie om samspel, lärande och interaktion2018Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 1365.
    Afrifa, Yamoah Kweku Kyei
    Stockholm University, Faculty of Science, Department of Geological Sciences.
    Reconstruction of the Southeast Asian hydro-climate using biomarkers and their hydrogen isotopic composition2015Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Southeast Asia is characterized by a monsoonal climate, with distinct wet and dry seasons. This has great impact on societies, agriculture and infrastructures. Despite the critical importance to understand the mechanisms that influence the variability of the Asian Monsoon, there is scarcity of both historical and paleoclimate proxy data from Southeast Asia. For this reason, two lakes from Thailand, Lake Pa Kho (LPK) and Lake Nong Thale Pron (NTP), which are located in the northeastern and southern part of Thailand, respectively, were cored. The region also offers the opportunity to study the potential influence of climate on the Angkor civilization. Overall, this project seeks to improve our understanding of the mechanisms that contribute to Asian monsoon variability and how the variability influenced Angkor Civilization. Here I present results on a 2000-years sediment record from LPK. The most important part of the work presented here consists of compound-specific hydrogen isotope ratios (δD), which are used to infer past changes in the hydrological cycle of Southeast Asia. This approach is based on the premise that δD of lipid biomarkers from plants, algae and microorganisms deposited in sediments reflects the δD of their source water, which in turn is influenced by local hydrology. A rapid increase in precipitation is inferred from ca. 700 to ca. 850 AD, after a long dry phase. The inferred shift to wet conditions likely contributed to the rise of the Angkor Civilization, by boosting agriculture. However, gradual drying occurred at around 900 AD until the 19th century. This long-term decline in precipitation, favoring ever more frequent occurrences of severe droughts, likely also contributed to the demise and fall of the Angkor, around 1400 AD. Comparison with other hydroclimate proxy records revealed that wet conditions in tropical SE Asia corresponded to a dry Western Pacific, wet conditions in the East Pacific, and vice versa - a pattern that can be explained by opposing centers of convection and subsidence. Moreover, our tropical record also appears to be anti-correlated with the subtropical East Asian Monsoon, possibly caused by rainout effects along moisture trajectories. These long-term rainfall shifts closely match patterns observed during periods of strong El Niño, and suggests a central role for Pacific Walker circulation as a driver of centennial-scale hydroclimatic change. Besides these results from LPK oriented towards reconstructing hydroclimate, I also present some initial results concerning the evolution of the plant community of LPK, based on compound specific 13C analysis, as well as first biomarker results from NTP.

  • 1366.
    Afsharian, Parastoo
    et al.
    Stockholm University, Faculty of Social Sciences, Department of Sociology.
    Lundberg, Linnea
    Stockholm University, Faculty of Social Sciences, Department of Sociology.
    Kan alla nå toppen?: En kvantitativ studie om könsskillnader i olika befattningar på den svenska arbetsmarknaden2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Kvinnor och män på den svenska arbetsmarknaden återfinns ännu idag inom olika sektorer, yrken och branscher. Trots flertalet tidigare forskningar samt politiska insatser har vi inte nått en jämställd arbetsmarknad. I denna studie avser vi att undersöka könsskillnaderna i upplevda avancemangsmöjligheter och huruvida det förefaller sig i både de högre och lägre befattningarna. Det teoretiska ramverket utgår från teorier som vanligtvis används för att förklara könssegregeringen på arbetsmarknaden, nämligen glastaket, glashissen och diskriminering. Tidigare forskning som har undersökt detta fenomen har visat på att kvinnor förr eller senare stöter på barriärer som hindrar de till avancemang. Viss forskning menar på att dessa hinder förekommer i de högre positionerna, medan annan forskning menar på att det förekommer i de lägre positionerna. Denna studie baserar sig på datamaterial från Levnadsnivåundersökningen 2010, där urvalet består av män och kvinnor i åldrarna 25–60 som har en anställning. Resultatet visar på att det är högre sannolikt att en man upplever interna avancemangsmöjligheter, än en kvinna. Däremot visar resultatet inte på att individers familjeliv har en effekt på upplevda interna avancemangsmöjligheter. Vid en uppdelning av de olika befattningarna visar resultatet vidare på att enbart kvinnor i de lägre befattningarna upplever sig ha svårt att avancera sig internt jämfört med män. Vid kontroll av individ- och arbetsrelaterade faktorer visar resultatet på att könsskillnaderna består enbart för respondenter i de lägre positionerna, vilket vidare stämmer överens med teorin om glashissen. 

  • 1367.
    Afshinnejad, Makan
    et al.
    Stockholm University, Faculty of Social Sciences, School of Business.
    Kuznetsova, Olga
    Stockholm University, Faculty of Social Sciences, School of Business.
    Motivation och förståelse : En studie om hur förståelse kan förmedlas och hur motivation kan höjas bland de anställda i ett företag under en omstruktureringsprocess2002Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Sammanfattning saknas.

  • 1368.
    Afsun, Donya
    et al.
    Stockholm University, Faculty of Humanities, Department of Linguistics, Phonetics.
    Forsman, Erika
    Stockholm University, Faculty of Humanities, Department of Linguistics, Phonetics.
    Halvarsson, Cecilia
    Stockholm University, Faculty of Humanities, Department of Linguistics, Phonetics.
    Jonsson, Emma
    Stockholm University, Faculty of Humanities, Department of Linguistics, Phonetics.
    Malmgren, Linda
    Stockholm University, Faculty of Humanities, Department of Linguistics, Phonetics.
    Neves, Juliana
    Stockholm University, Faculty of Humanities, Department of Linguistics, Phonetics.
    Marklund, Ulrika
    Stockholm University, Faculty of Humanities, Department of Linguistics, Phonetics.
    Effects of a film-based parental intervention on vocabulary development in toddlers aged 18-21 months2011In: Proceedings from Fonetik 2011: Speech, Music and Hearing; Quarterly Progress and Status Report, Stockholm, 2011, p. 105-108Conference paper (Other academic)
    Abstract [en]

    SPRINT is a language intervention project aimed to study the outcome of a parental home training program on children’s language development and future reading and writing skills. This study, which derives data from the SPRINT project, intended to examine the possible effects of a parental-based film intervention. It was conducted on toddlers aged 18-21 months from the Stockholm area with at least one parent who has Swedish as a first language. Parents of 78 children participated in the study and filled in 3 SECDI-w&s questionnaires rating their children's productive vocabulary. Children were randomized to either the intervention or the control group. Results indicated that the interventiongroup demonstrated significantly higher scores over time, F (2,78) = 5,192, p < .007. In the light of previous research it is concluded that this intervention contributes to an increase in productive vocabulary. However, the scores of the intervention group did not exceed the average range for Swedish children in the same age span. Furthermore the possible impact of parental education and thepresence of siblings on productive vocabulary was discussed.

  • 1369.
    Afyonoglu Kirbas, Yeliz
    Stockholm University, Faculty of Humanities, Department of Linguistics, General Linguistics.
    Neuronal activity to environmental sounds when presented together with semantically related words: An MMN study on monolingual and bilingual processing of homophones2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Neuronal activity of monolingual and bilinguals to environmental sounds and words that are semantically related to them were studied using the mismatch negativity (MMN) component of event-related potentials. MMN was expected to reflect the language selection process in bilinguals on the bases of semantics and phonology. In this regard, as lexical stimuli, interlingual homophones ‘car’ and ‘kar’ (snow) were presented together with semantically related environmental sounds in a passive auditory oddball paradigm. The lexical stimuli were recorded by a native English speaker. Three Turkish-English late bilinguals and one native English speaker participated in the study. An early MMN was elicited in both groups with a distribution over the fronto-central and central areas across the scalp with highest peak amplitude at -2.5 with a 113 ms latency. This response indicates that participants of the study were sensitive to the acoustic changes in two different types of stimuli. The further investigation of the interplay between environmental sounds and semantics displayed no conclusive result due to lack of data. Finally, the brain responses gathered from the bilinguals were not enough to draw a conclusion. Whether the bilinguals were sensitive to the sub-phonemic cues in the presented auditory lexical stimuli or not were inconclusive.

  • 1370. Afzal, Muhammad
    et al.
    Saleemi, Mohsin
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). KTH Royal Institute of Technology, Sweden.
    Wang, Baoyuan
    Xia, Chen
    Zhang, Wei
    He, Yunjuan
    Jayasuriya, Jeevan
    Zhu, Bin
    Fabrication of novel electrolyte-layer free fuel cell with semi-ionic conductor (Ba0.5Sr0.5Co0.8Fe0.2O3-delta- Sm0.2Ce0.8O1.9) and Schottky barrier2016In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 328, p. 136-142Article in journal (Refereed)
    Abstract [en]

    Perovskite Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) is synthesized via a chemical co-precipitation technique for a low temperature solid oxide fuel cell (LTSOFC) (300-600 degrees C) and electrolyte-layer free fuel cell (EFFC) in a comprehensive study. The EFFC with a homogeneous mixture of samarium doped ceria (SDC): BSCF (60%:40% by weight) which is rather similar to the cathode (SDC: BSCF in 50%:50% by weight) used for a three layer SOFC demonstrates peak power densities up to 655 mW/cm(2), while a three layer (anode/ electrolyte/cathode) SOFC has reached only 425 mW/cm(2) at 550 degrees C. Chemical phase, crystal structure and morphology of the as-prepared sample are characterized by X-ray diffraction and field emission scanning electron microscopy coupled with energy dispersive spectroscopy. The electrochemical performances of 3-layer SOFC and EFFC are studied by electrochemical impedance spectroscopy (EIS). As-prepared BSCF has exhibited a maximum conductivity above 300 S/cm at 550 degrees C. High performance of the EFFC device corresponds to a balanced combination between ionic and electronic (holes) conduction characteristic. The Schottky barrier prevents the EFFC from the electronic short circuiting problem which also enhances power output. The results provide a new way to produce highly effective cathode materials for LTSOFC and semiconductor designs for EFFC functions using a semiconducting-ionic material.

  • 1371.
    Afzelius, Björn
    Stockholm College.
    Electron microscopy on sea urchin gametes1957Doctoral thesis, comprehensive summary (Other academic)
  • 1372.
    Afzelius, Karl
    Stockholm College.
    Embryologische und zytologische Studien in Senecio und verwandten Gattungen1924Doctoral thesis, monograph (Other academic)
  • 1373.
    Agadjanian, Victor
    et al.
    Arizona State University.
    Nedoluzhko, Lesia
    Max Planck Institute for demographic Research.
    Kumskov, Gennady
    Kyrgyz-Russian Slavic University, Kyrgyzstan.
    Eager to Leave? Intentions to Migrate Abroad among Young People in Kyrgyzstan2008In: The international migration review, ISSN 0197-9183, E-ISSN 1747-7379, Vol. 42, no 3, p. 620-651Article in journal (Refereed)
    Abstract [en]

    This study examines young people’s intentions to migrate abroad in Kyrgyzstan, focusing in particular on differences between Asian and European-origin ethnic groups. The multivariate analyses of recent survey data show that even after controlling for socioeconomic characteristics and social embeddedness Europeans are significantly more inclined to migrate than Asians. Whereas no gender differences in migration intentions among either group are detected, marriage, childbearing, and social capital exhibit distinct ethnic-specific effects. Although economic considerations are prevailing stimuli for migration in both groups, the results point to the formation of two dominant ethnic-specific migration preference types – for temporary migration among Asians and permanent migration among Europeans.

  • 1374.
    Agahi, Neda
    et al.
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Dahlberg, Lena
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI). Dalarna University, Sweden.
    Lennartsson, Carin
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Social integration and alcohol consumption among older people: A four-year follow-up of a Swedish national sample2019In: Drug And Alcohol Dependence, ISSN 0376-8716, E-ISSN 1879-0046, Vol. 196, p. 40-45Article in journal (Refereed)
    Abstract [en]

    Background: Today's older people drink more alcohol than earlier cohorts of older people. Social integration has been identified as an important factor for older people's drinking, but the association is complex. This study investigates both high and low levels of social integration and their associations with longitudinal patterns of alcohol consumption among older women and men.

    Methods: Longitudinal nationally representative data of older Swedish women and men aged over 65 - the Swedish Level of Living Survey (LNU) and Swedish Panel Study of Living Conditions of the Oldest Old (SWEOLD) - from 2010/2011 and 2014 (n = 1048). Associations between social contacts and social activities at baseline and longitudinal patterns of drinking frequency were examined with multinomial logistic regression analyses.

    Results: Men reported drinking alcohol more often than women, but the most common drinking frequency among both women and men was to drink monthly or less. Drinking habits were generally stable over time. People with high levels of social activity at baseline were more likely to have a stable daily or weekly drinking frequency or increased drinking frequency over the four-year follow-up period, particularly women. People with low levels of social contacts and/or social activities were less likely to have a stable daily or weekly drinking frequency, compared to people in the low and stable drinking frequency group.

    Conclusions: Alcohol consumption is embedded in a social context, older people drink in social situations and social integration predicts continued drinking patterns.

  • 1375.
    Agahi, Neda
    et al.
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Fors, Stefan
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Fritzell, Johan
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Shaw, Benjamin A.
    Smoking and Physical Inactivity as Predictors of Mobility Impairment During Late Life: Exploring Differential Vulnerability Across Education Level in Sweden2018In: The journals of gerontology. Series B, Psychological sciences and social sciences, ISSN 1079-5014, E-ISSN 1758-5368, Vol. 73, no 4, p. 675-683Article in journal (Refereed)
    Abstract [en]

    Objectives: To test whether older adults from high and low educational groups are differentially vulnerable to the impact of smoking and physical inactivity on the progression of mobility impairment during old age.

    Methods: A nationally representative sample of older Swedish adults (n = 1,311), aged 57-76 years at baseline (1991), were followed for up to 23 years (2014). Multilevel regression was used to estimate individual trajectories of mobility impairment over the study period and to test for differences in the progression of mobility impairment on the basis of smoking status, physical activity status, and level of education.

    Results: Compared to nonsmokers, heavy smokers had higher levels and steeper increases in mobility impairment with advancing age. However, there were only small and statistically nonsignificant differences in the impact of heavy smoking on mobility impairment in high versus low education groups. A similar pattern of results was found for physical inactivity.

    Discussion: Differential vulnerability to unhealthy behaviors may vary across populations, age, time-periods, and health outcomes. In this study of older adults in Sweden, low and high education groups did not differ significantly in their associations between heavy smoking or physical inactivity, and the progression of mobility impairment.

  • 1376.
    Agahi, Neda
    et al.
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Kelfve, Susanne
    Stockholm University, Faculty of Social Sciences, Department of Sociology. Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Lennartsson, Carin
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Kåreholt, Ingemar
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI). Jönköping University, Sweden.
    Alcohol consumption in very old age and its association with survival: A matter of health and physical function2016In: Drug And Alcohol Dependence, ISSN 0376-8716, E-ISSN 1879-0046, Vol. 159, p. 240-245Article in journal (Refereed)
    Abstract [en]

    Background: Alcohol consumption in very old age is increasing; yet, little is known about the personal and health-related characteristics associated with different levels of alcohol consumption and the association between alcohol consumption and survival among the oldest old. Methods: Nationally representative data from the Swedish Panel Study of Living Conditions of the Oldest Old (SWEOLD, ages 76-101; n=863) collected in 2010/2011 were used. Mortality was analyzed unti12014. Alcohol consumption was measured with questions about frequency and amount. Drinks per month were calculated and categorized as abstainer, light-to-moderate drinker (0.5-30 drinks/month) and heavy drinker (>30 drinks/month). Multinomial logistic regressions and Laplace regressions were performed. Results: Compared to light-to-moderate drinkers, abstainers had lower levels of education and more functional health problems, while heavy drinkers were more often men, had higher levels of education, and no serious health or functional problems. In models adjusted only for age and sex, abstainers died earlier than drinkers. Among light-to-moderate drinkers, each additional drink/month was associated with longer survival, while among heavy drinkers, each additional drink/month was associated with shorter survival. However, after adjusting for personal and health-related factors, estimates were lower and no longer statistically significant. Conclusions: The association between alcohol consumption and survival in very old age seems to have an inverse J-shape; abstention and heavy use is associated with shorter survival compared to light-to moderate drinking. To a large extent, differences in survival are due to differences in baseline health and physical function.

  • 1377.
    Agahi, Neda
    et al.
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Lennartsson, Carin
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Kåreholt, Ingemar
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Shaw, Benjamin
    Trajectories of social activities from middle age to old age and late-life disability: a 36-year follow-up2013In: Age and Ageing, ISSN 0002-0729, E-ISSN 1468-2834, Vol. 42, no 6, p. 790-793Article in journal (Refereed)
    Abstract [en]

    Objectives: to examine the association between 34-year trajectories of social activity, from middle age to old age and late-life disability.                  

    Methods: data from the Swedish Level of Living Survey (LNU) and the Swedish Panel Study of the Oldest Old (SWEOLD) were used. LNU data from 1968, 1981, 1991 and 2000 were merged with SWEOLD data from 1992, 2002 and 2004 to create a longitudinal data set  with five observation periods. Trajectories of social activities covered 1968–2002, and late-life disability was measured  in 2004. The sample consisted of 729 individuals aged 33–61 at baseline (1968), who participated in at least four observation periods and who were free from mobility limitations at baseline. Four trajectories of social activity were identified and used as predictors of late-life disability.                  

    Results: reporting low/medium levels of social activity from mid-life to old age was the most common trajectory group. Persons reporting continuously low/medium or decreasing levels of social activity had higher odds ratios for late-life disability (OR = 2.33 and OR = 2.15, respectively) compared with those having continuously high levels of activity, even when adjusting for age, sex and mobility limitations, and excluding persons with baseline mobility limitations.                  

    Conclusions: results suggest that the disability risk associated with social activities is related to recent levels of activity, but also that risk may accumulate over time, as indicated by the higher disability risk associated with the continuously low/medium level social activity trajectory.

  • 1378.
    Agahi, Neda
    et al.
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Shaw, Benjamin A.
    Smoking trajectories from midlife to old age and the development of non-life-threatening health problems: A 34-year prospective cohort study2013In: Preventive Medicine, ISSN 0091-7435, E-ISSN 1096-0260, Vol. 57, no 2, p. 107-112Article in journal (Refereed)
    Abstract [en]

    Objective. To examine how trajectories of smoking observed over a 34-year period, were associated with the progression of mobility impairment, musculoskeletal pain, and symptoms of psychological distress from midlife to old age. Method. The Swedish Level of Living Survey (LNU) and the Swedish Panel Study of the Oldest Old (SWEOLD) were merged to create a nationally representative longitudinal sample of Swedish adults (aged 30-50 at baseline; n = 1060), with four observation periods, from 1968 through 2002. Five discrete smoking trajectory groups were treated as predictors of variation in health trajectories using multilevel regression. Results. At baseline, there were no differences in mobility impairment between smoking trajectory groups. Over time all smokers, particularly persistent and former heavy smokers, exhibited faster increases in mobility problems compared with persistent non-smokers. Additionally, all smoking groups reported more pain symptoms than the non-smokers, at baseline and over time, but most of these differences did not reach statistical significance. Persistent heavy smokers reported elevated levels of psychological distress at baseline and over time. Conclusion. Smokers, and even some former smokers, who survive into old age appear to be at increased risk for non-life-threatening conditions that can diminish quality of life and increase demands for services.

  • 1379.
    Agahi, Neda
    et al.
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Shaw, Benjamin A.
    Fors, Stefan
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Social and economic conditions in childhood and the progression of functional health problems from midlife into old age2014In: Journal of Epidemiology and Community Health, ISSN 0143-005X, E-ISSN 1470-2738, Vol. 68, no 8, p. 734-740Article in journal (Refereed)
    Abstract [en]

    Background Childhood living conditions have been found to predict health and mortality in midlife and in old age. This study examines the associations between social and economic childhood conditions and the onset and progression of functional health problems from midlife into old age, and the extent to which potential associations are mediated by educational attainment and smoking. Methods Data from the Level of Living Survey and the Swedish Panel Study of Living Conditions of the Oldest Old were merged to create a longitudinal data set with five repeated measures from 1968 to 2004 (n=1765, aged 30-50 years and free from functional health problems at baseline). Multilevel regression models were used to analyse retrospective reports of social and economic conditions in childhood (eg, conflicts or economic problems in the family) in relation to the progression of functional health problems over the 36-year period. Results Results showed that social and economic disadvantages in childhood were associated with an earlier onset and a faster progression of functional health problems from midlife into old age. Subsequent models showed that differences in educational attainment, but not smoking, explained much of the association between childhood disadvantages and trajectories of functional health problems. Conclusions According to these results, adverse social and economic conditions in childhood affect the development of functional health problems from midlife into old age indirectly through less favourable life careers, including lower education. Creating equal opportunities for educational attainment may help reduce the long-term effects of disadvantaged childhood conditions and postpone functional health problems.

  • 1380.
    Agahi, Neda
    et al.
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Silverstein, Merril
    Parker, Marti G.
    Stockholm University, Faculty of Social Sciences, Aging Research Center (ARC), (together with KI).
    Late-Life and Earlier Participation in Leisure Activities: Their Importance for Survival Among Older Persons2011In: Activities, Adaptation & Aging, ISSN 0192-4788, E-ISSN 1544-4368, Vol. 35, no 3, p. 210-222Article in journal (Refereed)
    Abstract [en]

    Is activity participation in old age important for survival independent of one's earlier history of participation? A nationally representative sample of 457 older persons was followed for 25 years with data from the Level-of-Living Survey and the SWEOLD study. Cox regressions showed that regardless of earlier activities and health, late-life leisure engagement was associated with enhanced survival, especially among men. Among women, earlier activities (study groups) also seem important, perhaps by providing social networks. Results suggest that it is worthwhile to encourage elderly people to participate in leisure activities and to facilitate their participation in the community even at high ages.

  • 1381. Agardh, E. E.
    et al.
    Ahlbom, A.
    Andersson, T.
    Efendic, S.
    Grill, V.
    Hallqvist, J.
    Norman, A.
    Ostenson, C. G.
    Work stress and low sense of coherence is associated with type 2 diabetes in middle-aged Swedish women: Diabetes Care2003In: Diabetes Care, Vol. 26, no 3, p. 719-24Article in journal (Refereed)
  • 1382. Agardh, E. E.
    et al.
    Ahlbom, A.
    Andersson, T.
    Efendic, S.
    Grill, V.
    Hallqvist, J.
    Ostenson, C. G.
    Explanations of socioeconomic differences in excess risk of type 2 diabetes in Swedish men and women: Diabetes Care2004In: Diabetes Care, Vol. 27, no 3, p. 716-21Article in journal (Refereed)
  • 1383. Agardh, Emilie E.
    et al.
    Lundin, Andreas
    Lager, Anton
    Allebeck, Peter
    Koupil, Ilona
    Stockholm University, Faculty of Social Sciences, Centre for Health Equity Studies (CHESS). Karolinska Institutet, Sweden.
    Andreasson, Sven
    Östenson, Claes-Göran
    Danielsson, Anna-Karin
    Alcohol and type 2 diabetes: The role of socioeconomic, lifestyle and psychosocial factors2019In: Scandinavian Journal of Public Health, ISSN 1403-4948, E-ISSN 1651-1905, Vol. 47, no 4, p. 408-416Article in journal (Refereed)
    Abstract [en]

    AIMS: We investigate (a) alcohol consumption in association with type 2 diabetes, taking heavy episodic drinking (HED), socioeconomic, health and lifestyle, and psychosocial factors into account, and (b) whether a seemingly protective effect of moderate alcohol consumption on type 2 diabetes persists when stratified by occupational position.

    METHODS: This population-based longitudinal cohort study comprises 16,223 Swedes aged 18-84 years who answered questionnaires about lifestyle, including alcohol consumption in 2002, and who were followed-up for self-reported or register-based diabetes in 2003-2011. Odds ratios (ORs) with 95% confidence intervals (CIs) were estimated in a multivariable-adjusted logistic regression model for all participants and stratified by high and low occupational position. We adjusted for HED, socioeconomic (occupational position, cohabiting status and unemployment), health and lifestyle (body mass index (BMI), blood pressure, smoking, physical inactivity, poor general health, anxiety/depression and psychosocial (low job control and poor social support) characteristics one by one, and the sets of these factors.

    RESULTS: Moderate consumption was inversely associated with type 2 diabetes after controlling for health and lifestyle (OR=0.47; 95% CI: 0.29-0.79) and psychosocial factors (OR=0.40; 95% CI: 0.22-0.79) when compared to non-drinkers. When adjusting for socioeconomic factors, there was still an inverse but non-significant association (OR=0.59; 95% CI: 0.35-1.00). In those with high occupational position, there was no significant association between moderate consumption and type 2 diabetes after adjusting for socioeconomic (OR=0.67; 95% CI: 0.3-1.52), health and lifestyle (OR=0.70; 95% CI: 0.32-1.5), and psychosocial factors (OR=0.75; 95% CI: 0.23-2.46). On the contrary, in those with low occupational position, ORs decreased from 0.55 (95% CI: 0.28-1.1) to 0.35 (95% CI: 0.15-0.82) when adjusting for psychosocial factors, a decrease that was solely due to low job control. HED did not influence any of these associations.

    CONCLUSIONS: Moderate alcohol consumption is associated with a lower risk of type 2 diabetes, after adjusting for HED, health and lifestyle, and psychosocial characteristics. The association was inverse but non-significant after adjusting for socioeconomic factors. When stratified by occupational position, there was an inverse association only in those with low occupational position and after adjusting for low job control.

  • 1384. Agarwal, Abhishek
    et al.
    Lipstein, Arthur E.
    Young, Donovan
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
    Scattering amplitudes of massive N = 2 gauge theories in three dimensions2014In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 89, no 4, p. 045020-Article in journal (Refereed)
    Abstract [en]

    We study the scattering amplitudes of mass-deformed Chern-Simons theories and Yang-Mills-Chern-Simons theories with N = 2 supersymmetry in three dimensions. In particular, we derive the on-shell supersymmetry algebras which underlie the scattering matrices of these theories. We then compute various 3 and 4-point on-shell tree-level amplitudes in these theories. For the mass-deformed Chern-Simons theory, odd-point amplitudes vanish and we find that all of the 4-point amplitudes can be encoded elegantly in superamplitudes. For the Yang-Mills-Chern-Simons theory, we obtain all of the 4-point tree-level amplitudes using a combination of perturbative techniques and algebraic constraints and we comment on difficulties related to computing amplitudes with external gauge fields using Feynman diagrams. Finally, we propose a Britto-Cachazo-Feng-Witten recursion relation for mass-deformed theories in three dimensions and discuss the applicability of this proposal to mass-deformed N = 2 theories.

  • 1385. Agarwal, Girish
    et al.
    Allen, Roland E.
    Bezdekova, Iva
    Boyd, Robert W.
    Chen, Goong
    Hanson, Ronald
    Hawthorne, Dean L.
    Hemmer, Philip
    Kim, Moochan B.
    Kocharovskaya, Olga
    Lee, David M.
    Lidstrom, Sebastian K.
    Lidstrom, Suzy
    Losert, Harald
    Maier, Helmut
    Neuberger, John W.
    Padgett, Miles J.
    Raizen, Mark
    Rajendran, Surjeet
    Rasel, Ernst
    Schleich, Wolfgang P.
    Scully, Marlan O.
    Shchedrin, Gavriil
    Shvets, Gennady
    Sokolov, Alexei V.
    Svidzinsky, Anatoly
    Walsworth, Ronald L.
    Weiss, Rainer
    Wilczek, Frank
    Stockholm University, Faculty of Science, Department of Physics. Center for Theoretical physics, MIT, USA; Shanghai Jiao Tong University, China; Arizona State University, USA.
    Willner, Alan E.
    Yablonovitch, Eli
    Zheludev, Nikolay
    Light, the universe and everything-12 Herculean tasks for quantum cowboys and black diamond skiers2018In: Journal of Modern Optics, ISSN 0950-0340, E-ISSN 1362-3044, Vol. 65, no 11, p. 1261-1308Article in journal (Refereed)
    Abstract [en]

    The Winter Colloquium on the Physics of Quantum Electronics (PQE) has been a seminal force in quantum optics and related areas since 1971. It is rather mind-boggling to recognize how the concepts presented at these conferences have transformed scientific understanding and human society. In January 2017, the participants of PQE were asked to consider the equally important prospects for the future, and to formulate a set of questions representing some of the greatest aspirations in this broad field. The result is this multi-authored paper, in which many of the world's leading experts address the following fundamental questions: (1) What is the future of gravitational wave astronomy? (2) Are there new quantum phases of matter away from equilibrium that can be found and exploited - such as the time crystal? (3) Quantum theory in uncharted territory: What can we learn? (4) What are the ultimate limits for laser photon energies? (5) What are the ultimate limits to temporal, spatial and optical resolution? (6) What novel roles will atoms play in technology? (7) What applications lie ahead for nitrogen-vacancy centres in diamond? (8) What is the future of quantum coherence, squeezing and entanglement for enhanced super-resolution and sensing? (9) How can we solve (some of) humanity's biggest problems through new quantum technologies? (10) What new understanding of materials and biological molecules will result from their dynamical characterization with free-electron lasers? (11) What new technologies and fundamental discoveries might quantum optics achieve by the end of this century? (12) What novel topological structures can be created and employed in quantum optics?

  • 1386. Agarwal, Sahil
    et al.
    Del Sordo, Fabio
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Yale University, USA.
    Wettlaufer, John S.
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Yale University, USA; University of Oxford, UK.
    EXOPLANETARY DETECTION BY MULTIFRACTAL SPECTRAL ANALYSIS2017In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 153, no 1, article id 12Article in journal (Refereed)
    Abstract [en]

    Owing to technological advances, the number of exoplanets discovered has risen dramatically in the last few years. However, when trying to observe Earth analogs, it is often difficult to test the veracity of detection. We have developed a new approach to the analysis of exoplanetary spectral observations based on temporal multifractality, which identifies timescales that characterize planetary orbital motion around the host star and those that arise from stellar features such as spots. Without fitting stellar models to spectral data, we show how the planetary signal can be robustly detected from noisy data using noise amplitude as a source of information. For observation of transiting planets, combining this method with simple geometry allows us to relate the timescales obtained to primary and secondary eclipse of the exoplanets. Making use of data obtained with ground-based and space-based observations we have tested our approach on HD 189733b. Moreover, we have investigated the use of this technique in measuring planetary orbital motion via Doppler shift detection. Finally, we have analyzed synthetic spectra obtained using the SOAP 2.0 tool, which simulates a stellar spectrum and the influence of the presence of a planet or a spot on that spectrum over one orbital period. We have demonstrated that, so long as the signal-to-noise-ratio >= 75, our approach reconstructs the planetary orbital period, as well as the rotation period of a spot on the stellar surface.

  • 1387. Agarwal, Sahil
    et al.
    Wettlaufer, John S.
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Yale University, USA; University of Oxford, UK.
    Fluctuations in Arctic sea-ice extent: comparing observations and climate models2018In: Philosophical Transactions. Series A: Mathematical, physical, and engineering science, ISSN 1364-503X, E-ISSN 1471-2962, Vol. 376, no 2129, article id 20170332Article in journal (Refereed)
    Abstract [en]

    The fluctuation statistics of the observed sea-ice extent during the satellite era are compared with model output from CMIP5 models using a multifractal time series method. The two robust features of the observations are that on annual to biannual time scales the ice extent exhibits white noise structure, and there is a decadal scale trend associated with the decay of the ice cover. It is shown that (i) there is a large inter-model variability in the time scales extracted from the models, (ii) none of the models exhibits the decadal time scales found in the satellite observations, (iii) five of the 21 models examined exhibit the observed white noise structure, and (iv) the multi-model ensemble mean exhibits neither the observed white noise structure nor the observed decadal trend. It is proposed that the observed fluctuation statistics produced by this method serve as an appropriate test bed for modelling studies. This article is part of the theme issue 'Modelling of sea-ice phenomena'.

  • 1388. Agarwal, Sahil
    et al.
    Wettlaufer, John S.
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Yale University, USA; University of Oxford, UK.
    Maximal stochastic transport in the Lorenz equations2016In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 380, no 1-2, p. 142-146Article in journal (Refereed)
    Abstract [en]

    We calculate the stochastic upper bounds for the Lorenz equations using an extension of the background method. In analogy with Rayleigh-Benard convection the upper bounds are for heat transport versus Rayleigh number. As might be expected, the stochastic upper bounds are larger than the deterministic counterpart of Souza and Doering [1], but their variation with noise amplitude exhibits interesting behavior. Below the transition to chaotic dynamics the upper bounds increase monotonically with noise amplitude. However, in the chaotic regime this monotonicity depends on the number of realizations in the ensemble; at a particular Rayleigh number the bound may increase or decrease with noise amplitude. The origin of this behavior is the coupling between the noise and unstable periodic orbits, the degree of which depends on the degree to which the ensemble represents the ergodic set. This is confirmed by examining the close returns plots of the full solutions to the stochastic equations and the numerical convergence of the noise correlations. The numerical convergence of both the ensemble and time averages of the noise correlations is sufficiently slow that it is the limiting aspect of the realization of these bounds. Finally, we note that the full solutions of the stochastic equations demonstrate that the effect of noise is equivalent to the effect of chaos.

  • 1389. Agarwal, Sahil
    et al.
    Wettlaufer, John S.
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Yale University, USA; University of Oxford, United Kingdom.
    The Statistical Properties of Sea Ice Velocity Fields2017In: Journal of Climate, ISSN 0894-8755, E-ISSN 1520-0442, Vol. 30, no 13, p. 4873-4881Article in journal (Refereed)
    Abstract [en]

    By arguing that the surface pressure field over the Arctic Ocean can be treated as an isotropic, stationary, homogeneous, Gaussian random field, Thorndike estimated a number of covariance functions from two years of data (1979 and 1980). Given the active interest in changes of general circulation quantities and indices in the polar regions during the recent few decades, the spatial correlations in sea ice velocity fields are of particular interest. It is thus natural to ask, How persistent are these correlations?'' To this end, a multifractal stochastic treatment is developed to analyze observed Arctic sea ice velocity fields from satellites and buoys for the period 1978-2015. Since it was previously found that the Arctic equivalent ice extent (EIE) has a white noise structure on annual to biannual time scales, the connection between EIE and ice motion is assessed. The long-term stationarity of the spatial correlation structure of the velocity fields and the robustness of their white noise structure on multiple time scales is demonstrated; these factors (i) combine to explain the white noise characteristics of the EIE on annual to biannual time scales and (ii) explain why the fluctuations in the ice velocity are proportional to fluctuations in the geostrophic winds on time scales of days to months. Moreover, it is shown that the statistical structure of these two quantities is commensurate from days to years, which may be related to the increasing prevalence of free drift in the ice pack.

  • 1390. Agasthya, Lokahith
    et al.
    Picardo, Jason R.
    Sivaramakrishnan, Ravichandran
    Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
    Govindarajan, Rama
    Ray, Samriddhi Sankar
    Understanding droplet collisions through a model flow: Insights from a Burgers vortex2019In: Physical review. E, ISSN 2470-0045, E-ISSN 2470-0053, Vol. 99, no 6, article id 063107Article in journal (Refereed)
    Abstract [en]

    We investigate the role of intense vortical structures, similar to those in a turbulent flow, in enhancing collisions (and coalescences) which lead to the formation of large aggregates in particle-laden flows. By using a Burgers vortex model, we show, in particular, that vortex stretching significantly enhances sharp inhomogeneities in spatial particle densities, related to the rapid ejection of particles from intense vortices. Furthermore our work shows how such spatial clustering leads to an enhancement of collision rates and extreme statistics of collisional velocities. We also study the role of polydisperse suspensions in this enhancement. Our work uncovers an important principle, which, if valid for realistic turbulent flows, may be a factor in how small nuclei water droplets in warm clouds can aggregate to sizes large enough to trigger rain.

  • 1391. Agasti, Soumitra
    et al.
    Maity, Soham
    Szabó, Kálmán J.
    Stockholm University, Faculty of Science, Department of Organic Chemistry.
    Maiti, Debabrata
    Palladium-Catalyzed Synthesis of 2,3-Disubstituted Benzofurans: An Approach Towards the Synthesis of Deuterium Labeled Compounds2015In: Advanced Synthesis and Catalysis, ISSN 1615-4150, E-ISSN 1615-4169, Vol. 357, no 10, p. 2331-2338Article in journal (Refereed)
    Abstract [en]

    Palladium-catalyzed oxidative annulations between phenols and alkenylcarboxylic acids produced a library of benzofuran compounds. Depending on the nature of the substitution of the phenol precursor, either 2,3-dialkylbenzofurans or 2-alkyl-3-methylene-2,3-dihydrobenzofurans can be synthesized with excellent regioselectivity. Reactions between conjugated 5-phenylpenta-2,4-dienoic acids and phenol gave 3-alkylidenedihydrobenzofuran alkaloid motifs while biologically active 7-arylbenzofuran derivatives were prepared by starting from 2-phenylphenols. More interestingly, selective incorporation of deuterium from D2O has been discovered, which offers an attractive one-step method to access deuterated compounds.

  • 1392.
    Agaton, Niklas
    Stockholm University, Faculty of Humanities, Department of Media Studies.
    Cannabis - i dag och i morgon: Reflektionsrapport2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Som examensarbete har jag producerat en film om Cannabis. En pilot om 22 minuter avsedd att användas som pitch inför en större dokumentär.

    I piloten har jag intervjuat fyra personer med olika erfarenheter och åsikter kring ämnet. Professor Ted Goldberg, professor Fred Nyberg, socialsekreterare Helene Adamee och en före detta cannabismissbrukare.

    Dessa intervjuer har jag därefter redigerat ihop till en pilot som tar upp ämnen som varför ungdomar börjar röka cannabis, det faktum att det pågår en förändring inom den globala drogpolitiken som kan få konsekvenser för Sverige, samt olika åsikter kring vår aktuella narkotikapolitik.     

    Jag spelar själv en aktiv roll i piloten som en journalist, och före detta cannabismissbrukare, som nu är på jakt efter svaren till de frågor mitt missbruk genererat.

  • 1393.
    Agbetsoamedo, Yvonne
    Stockholm University, Faculty of Humanities, Department of Linguistics. University of Ghana.
    Aspects of the Grammar and Lexicon of Sεlεε2014Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis is a description of some aspects of the grammar of Sɛlɛɛ, a Ghana-Togo-Mountain (GTM) language, based on my own fieldwork. The thesis consists of an introduction and five papers.

    Paper (I), Noun classes in Sεlεε, describes the noun class system of Sɛlɛɛ. It consists of eight noun class prefixes, four marking singular and four plural. They are paired in irregular ways to form eight genders (singular-plural pairs). Nouns agree with determiners, numerals and interrogative qualifiers within the noun phrase and can be indexed on the predicate. Nouns are allocated to classes/genders based partly on semantic notions.

    Paper (II), Sεlεε (with Francesca Di Garbo), details the morphological encoding of diminution in Sɛlɛɛ either by the suffixes -bi, -bii, -mii, -e or -nyi alone or in combination with noun class shift. Augmentation is not expressed morphologically.

    Paper (III), The tense and aspect system of Sεlεε: A preliminary analysis, shows that Sɛlɛɛ, unlike most Kwa languages, has a rather elaborate tense system encompassing present, hodiernal, pre-hodiernal and future tenses. The aspectual categories are progressive, habitual and perfect. Both categories often amalgamate with first person singular subject clitics.

    Paper (IV), Standard negation in Sεlεε, deals with the negation of declarative verbal main clauses. This is primarily encoded by a high tone, sometimes combined with segmental morphemes, portmanteau negative tense-aspect morphemes and vowel lengthening. Each tense-aspect category has at least one particular negation strategy.

    Paper (V), Unravelling temperature terms in Sεlεε (with Francesca Di Garbo), investigates the grammatical constructions employed for temperature evaluations. Personal feeling is only encoded via subjects, while ambient and tactile evaluations are construed attributively and predicatively.

    A comparison of Selee and other GTM languages revealed similar noun morphologies but very different verbal morphologies.

  • 1394.
    Agbetsoamedo, Yvonne
    Stockholm University, Faculty of Humanities, Department of Linguistics, General Linguistics. University of Ghana.
    Noun classes in Sɛlɛɛ2014In: Journal of West African Languages, ISSN 0022-5401, Vol. XLI, no 1, p. 95-124Article in journal (Refereed)
    Abstract [en]

    This paper describes the noun class system of Sl, a Na-Togo, Kwa (Niger-Congo) language spoken in the Volta Region of Ghana. As shown in this paper, Sl hasa noun class system with an equal number of singular and plural classes that are paired inirregular ways. The singular-plural pairs are referred to as genders. Nouns normally agreewith certain modifiers within the noun phrase. The agreement targets are determiners,numerals, interrogative pronouns and some adjectives. Outside the noun phrase, nounclasses may be indexed on the verb to signal long distance anaphora, a strategy thatspeakers rarely use. The paper provides a detailed account of possible semantic andcultural motivations for the assignment of nouns to a particular gender and/or class.

  • 1395.
    Agbetsoamedo, Yvonne
    Stockholm University, Faculty of Humanities, Department of Linguistics, General Linguistics. University of Ghana.
    Standard negation in SɛlɛɛIn: Afrika und Übersee, ISSN 0002-0427Article in journal (Refereed)
    Abstract [en]

    This paper discusses standard negation in Sɛlɛɛ. Sɛlɛɛ is a Ghana-Togo Mountain (GTM) Language of the Kwa group of the Niger Congo family. Standard negation is the negation of declarative verbal clauses. Different strategies are used in Sɛlɛɛ to negate declarative verbal main clauses depending on the tense and aspect category of the verb. The basic negation strategy used in standard negation is tonal alternation, with or without other negation markers. The other strategies are the use of portmanteau morphemes, affixes and vowel lengthening. Interestingly, in one and the same tense paradigm, different persons can select different negation strategies. There is syncretism among the 1st person singular forms of the negative recent past, the negative habitual and the negative perfect.

  • 1396.
    Agbetsoamedo, Yvonne
    Stockholm University, Faculty of Humanities, Department of Linguistics, General Linguistics. University of Ghana, Ghana.
    The tense and aspect system of Sɛlɛɛ: A preliminary analysis2015Manuscript (preprint) (Other academic)
  • 1397. Agbetsoamedo, Yvonne
    et al.
    Ameka, Felix
    Atintono, Samuel
    Koptjevskaja Tamm, Maria
    Stockholm University, Faculty of Humanities, Department of Linguistics, General Linguistics.
    Temperature terms in the Ghanaian languages in a typological perspective2015Conference paper (Refereed)
    Abstract [en]

    This talk deals with the conceptualisation of temperature in some of the Ghanaian languages as reflected in their systems of central temperature terms, such as hot, cold, to freeze, etc. We will discuss these systems in the light of a large-scale cross-linguistic collaborative project, involving 35 researchers (including the present authors) and covering more than 50 genetically, areally and typologically diverse languages (Koptjevskaja-Tamm ed. 2015). The key questions addressed here are how the different languages carve up the temperature domain by means of their linguistic expressions, and how the temperature expressions are used outside of the temperature domain. Languages cut up the temperature domain among their expressions according to three main dimensions: TEMPERATURE VALUES (e.g., warming vs. cooling temperatures, or excessive heat vs. pleasant warmth), FRAMES OF TEMPERATURE EVALUATION (TACTILE, The stones are cold; AMBIENT, It is cold here; and PERSONAL-FEELING, I am cold), and ENTITIES whose “temperature” is evaluated.  Although the temperature systems are often internally heterogeneous, we may still talk about the main temperature value distinctions for the whole system. The Ghanaian languages favour the cross-linguistically preferred two-value systems, with water often described by a more elaborated system. An interesting issue concerns conventionalisation and frequency of expressions with a primary meaning outside of the temperature domain, for temperature uses. For instance, the conventionalised expressions for talking about ‘warm/hot’ in Ewe involve sources of heat (‘fire’) and bodily exuviae (‘sweat’). The Ghanaian languages often manifest numerous extended uses of their temperature terms. However, strikingly, none of them conforms to one of the most widely quoted conceptual metaphors, “affection is warmth” (Lakoff & Johnson 1999:50), which is also true for many other languages in (West) Africa and otherwise.

  • 1398.
    Agbetsoamedo, Yvonne
    et al.
    Stockholm University, Faculty of Humanities, Department of Linguistics, General Linguistics. University of Ghana, Ghana.
    Di Garbo, Francesca
    Stockholm University, Faculty of Humanities, Department of Linguistics, General Linguistics.
    Sɛlɛɛ2015In: Edinburgh handbook of evaluative morphology / [ed] Nicola Grandi, Livia Kortvelyessy, Edinburgh: Edinburgh University Press, 2015, p. 487-495Chapter in book (Refereed)
  • 1399.
    Agbetsoamedo, Yvonne
    et al.
    Stockholm University, Faculty of Humanities, Department of Linguistics, General Linguistics. University of Ghana, Ghana.
    Di Garbo, Francesca
    Stockholm University, Faculty of Humanities, Department of Linguistics, General Linguistics.
    Unravelling temperature terms in Sɛlɛɛ2015In: The linguistics of temperature / [ed] Maria Koptjevskaja-Tamm, Amsterdam: John Benjamins Publishing Company, 2015, p. 107-127Chapter in book (Refereed)
    Abstract [en]

    This paper investigates the encoding of temperature in Sɛlɛɛ, a Niger-Congo language of the Kwa group, spoken in Ghana. The lexicon of temperature in Sɛlɛɛ consists of six central and two non-central temperature terms, distributed among the word classes of nouns, adjectives and verbs. The grammatical constructions associated with temperature evaluation vary according to the word-class status of each temperature term and its contexts of use. The distribution of the different grammatical constructions according to different types of temperature evaluation is discussed in the paper. Metaphorical uses of temperature-related terms are also discussed in the context of neighbouring and highly related languages. Finally, special patterns of temperature evaluation in connection with water are surveyed.

  • 1400. Agbor, Dieudonné
    et al.
    Boman, Jan
    Stockholm University, Faculty of Science, Department of Mathematics.
    On the Modulus of Continuity of Mappings Between Euclidean Spaces2013In: Mathematica Scandinavica, ISSN 0025-5521, E-ISSN 1903-1807, Vol. 112, no 1, p. 147-160Article in journal (Refereed)
    Abstract [en]

    Let f be a function from R-P to R-q and let Lambda be a finite set of pairs (theta, eta) is an element of R-P x R-q. Assume that the real-valued function (eta, f(x)) is Lipschitz continuous in the direction theta for every (theta, eta) is an element of Lambda. Necessary and sufficient conditions on Lambda are given for this assumption to imply each of the following: (1) that f is Lipschitz continuous, and (2) that f is continuous with modulus of continuity <= C epsilon vertical bar log epsilon vertical bar.

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