18 research outputs found
8.SINIF FEN BİLİMLERİ ÖĞRETİM PROGRAMININ VE 2019,2020 YILLARINA AİT LGS SORULARININ SOLO TAKSONOMİSİNE GÖRE İNCELENMESİ
No full textBu araştırmada 8.sınıf fen bilimleri öğretim programı ve 2019-2020 yıllarına ait liseye geçiş sınavı soruları SOLO taksonomisine göre analiz edilmesi amaçlanmıştır. Doküman inceleme yöntemi kullanılarak yapılan araştırmada sorular ve kazanımlar Fizik, Kimya, Yer Bilimleri ve Biyoloji alanlarına ayrılarak incelenmiştir. Alanlara ait kazanımların ve sınav sorularının SOLO ortalaması hesaplanmış ve karşılaştırılmıştır. Öğrencilerin bir üst öğrenime hazırlanmasında ve ölçülmesinde yetersizlik olduğu ve kazanımlarla soruların farklı bilişsel seviyelere eşit dağılmadığı tespit edilmiştir. Buna göre öğrencilerden edinmeleri beklenen kazanımlarla ölçülen kazanımların kısmen uyumlu olduğu söylenebilir. Bu durum bir üst öğrenime geçiş yeterliliğinin ölçülmesinde eksiklik olarak görülebilir. Sınavlarda tüm bilişsel seviyelere yönelik sorulara kazanımlarla uyumlu şekilde yer verilmesi önerilebilir.https://doi.org/10.33418/ataunikkefd.835873https://dergipark.org.tr/tr/pub/ataunikkefd/issue/67326/83587
Some characterizations for Legendre curves having proper mean curvature vector in Lorentz-Sasakian manifolds
No full textBiharmonic Frenet and non-Frenet Legendre curves in 3-dimensional normal almost paracontact metric manifolds
No full textAiming for ultra-scalable ePortfolio distribution using peer-to-peer networks
No full text08.07.13 KB. Ok to add published version to Spiral. EIfEL says author can use as please without restriction.In this paper the authors discuss how peer-to-peer technology offers a practical solution to building highly scalable Europe-wide and worldwide ePortfolio networks over existing network infrastructures.This solution also offers the effect of empowering individuals through moving the management and storage responsibilities onto the portfolio owners, decoupling users from any single institutional ePortfolio service provider The authors do not present this solution as the single way forward, but as an alternative to what is seen as a mainly client-server and Web-based approach to ePortfolio development, and to encourage developers to explore the possibilities for ePortfolio integration with emerging and relatively immature technologies. A prototype implementation is reported and future developments described
From Scratch Closure to Electrolyte Barrier Restoration in Self-Healing Polyurethane Coatings
No full textThe effects of the soft block fraction and H-bond state in thermoplastic polyurethanes on autonomous entropy-driven scratch closure and barrier restoration are studied. To this aim, comparable polyurethanes with different segmentation states are applied as organic coatings on plain carbon steel plates, scratched under very well-controlled conditions, and the scratch closure and sealing kinetics are studied in detail. The scratch closure is measured optically, while the barrier restoration is probed by the accelerated cyclic electrochemical technique (ACET). Scratch closure, attributed to entropic elastic recovery (EER), is followed in a marked two-step process by barrier restoration governed by local viscous flow and the state of the interfacial hydrogen bonding. Polyurethanes with a lower soft phase fraction lead to a higher urea/urethane ratio, which in turn influences the healing efficiency of each healing step. Interestingly, softer polyurethanes leading to efficient crack closure were unable to sufficiently restore barrier properties. The present work highlights the critical role of the soft/hard block and urea/urethane H-bond state content on crack closure and barrier restoration of anticorrosive organic coatings and points at design rules for the design of more efficient corrosion-protective self-healing polyurethanes.</p
Christian approach toward HIV/AIDS prevention
No full textAuthor's name and surname: František Krampota Institution: Department of Pastoral Theology and Law Sciences, Catholic Theological Faculty, Charles University in Prague Name of thesis: Christian Approach toward HIV/AIDS Prevention Thesis supervizor: Dr. Eliáš Vojtěch Number of pages: 87 Key words: HIV, AIDS, statistics, way of infection, prevencion, ACET The Thesis analyses: This diploma work deals with AIDS from three points of view: history of diffusion, current situation and medical perspective (etiology, modes of transmission, symptoms, impact on life of a patient and his community, treatment). The issue of prevention is discussed both generally as well as concretely (prevention of HIV). The author also deals with Christian attitude toward HIV/AIDS (educative programmes focused on sexual health and a family life) and the role of the Christian Church in a fight against this disease. A vital part of this work is a field resarch among young people (age 15-18) monitoring their knowledge about HIV/AIDS. The author finally defines important issues that should be a part of every preventive work and based on his quantitative data as well as on his experience he recommends, how to implememt them into a practical preventive lesson. Počet znaků: 133 42
Christian approach toward HIV/AIDS prevention
No full textAuthor's name and surname: František Krampota Institution: Department of Pastoral Theology and Law Sciences, Catholic Theological Faculty, Charles University in Prague Name of thesis: Christian Approach toward HIV/AIDS Prevention Thesis supervizor: Dr. Eliáš Vojtěch Number of pages: 87 Key words: HIV, AIDS, statistics, way of infection, prevencion, ACET The Thesis analyses: This diploma work deals with AIDS from three points of view: history of diffusion, current situation and medical perspective (etiology, modes of transmission, symptoms, impact on life of a patient and his community, treatment). The issue of prevention is discussed both generally as well as concretely (prevention of HIV). The author also deals with Christian attitude toward HIV/AIDS (educative programmes focused on sexual health and a family life) and the role of the Christian Church in a fight against this disease. A vital part of this work is a field resarch among young people (age 15-18) monitoring their knowledge about HIV/AIDS. The author finally defines important issues that should be a part of every preventive work and based on his quantitative data as well as on his experience he recommends, how to implememt them into a practical preventive lesson. Počet znaků: 133 42
Shell-ferromagnetism and decomposition in off-stoichiometric Ni50Mn50–xSbx Heuslers
No full textWOS: 000457409600012Off stoichiometric Heuslers in the form Ni(50)Mn(50-x)Z(x), where Z can be a group 13-15 element of the periodic system, decompose at about 650 K into a ferromagnetic full Heusler Ni(50)Mn(25)Z(25) and an antiferromagnetic Ni50Mn50 component. We study here the case for Z as Sb and report on shell-ferromagnetic properties as well as thermal instabilities. Unlike the case for other Z-elements, in Ni50Mn50-xSbx, the minimum decomposition temperature corresponds to a temperature lying within the austenite state so that it is possible to observe the change in the martensitic transition temperature while annealing, thus providing further information on the change of composition during annealing. Scherrer analysis performed on emerging peaks related to the cubic full-Heusler shows that the precipitate size for shell-FM properties to become observable is around 5-10 nm. Other than vertical shifts in the field-dependence of the magnetization, which are also observed in compounds with Z other than Sb, concurrent exchange-bias effects are observed in the case with Z as Sb. (C) Author(s).Deutsche Forschungsgemeinschaft (DFG)German Research Foundation (DFG) [SPP 1599]This work was supported by the Deutsche Forschungsgemeinschaft (DFG) (No. SPP 1599). The DAAD is gratefully acknowledged
Magnetic and structural instabilities in mictomagnetic Cu50Mn45Al5 against the formation of ferromagnetic precipitates
No full textWOS: 000504049300007A new property of Heusler alloys known as shell-ferromagnetism is observed predominantly in NiMn-based Heusler alloys with X as Ga, Al, In and Sn. An antiferromagnetic-matrix/shell-ferromagnetic precipitate dual-phase generates from an anti-ferromagnetic initial structure with temper-annealing in an external magnetic field. The present study focuses on the magnetic and structural instabilities in CuMn-based Cu50Mn45Al5 Heusler alloy when temper-annealed under a magnetic field, as in NiMn-based Heusler alloys. The ternary Cu50Mn45Al5 Heusler alloy exhibits a cubic mictomagnetic structure in its initial state. Structural decomposition occurs during temper-annealing under a magnetic field from the initial state to a triple-phase composite alloy. The decomposed phases are identified to be cubic L2(1) Cu2MnAl, cubic L1(0)Cu(50)Mn(50) and A13 beta-Mn. As observed in shell-ferromagnetism, the ferromagnetic Cu-2 MnAl precipitates form in a mictomagnetic CuMn matrix with an additional beta-Mn component.Scientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [118M148]This work supported by the Scientific and Technological Research Council of Turkey (TUBITAK), Grant No: 118M148. The author thanks M. Acet for useful discussions
Tissue Fractions of Cadmium in Two Hyperaccumulating Jerusalem Artichoke Genotypes
No full textIn order to investigate the mechanisms in two Jerusalem artichoke (Helianthus tuberosus L.) genotypes that hyperaccumulate Cd, a sand-culture experiment was carried out to characterize fractionation of Cd in tissue of Cd-hyperaccumulating genotypes NY2 and NY5. The sequential extractants were: 80% v/v ethanol (FE), deionized water (F-W), 1M NaCl (F-NaCl), 2% v/v acetic acid (F-Acet), and 0.6M HCl (F-HCl). After 20 days of treatments, NY5 had greater plant biomass and greater Cd accumulation in tissues than NY2. In both genotypes the FNaCl fraction was the highest in roots and stems, whereas the FAcet and FHCl fractions were the highest in leaves. With an increase in Cd concentration in the culture solution, the content of every Cd fraction also increased. The FW and FNaCl ratios in roots were lower in NY5 than in NY2, while the amount of other Cd forms was higher. It implied that, in high accumulator, namely, NY5, the complex of insoluble phosphate tends to be shaped more easily which was much better for Cd accumulation. Besides, translocation from plasma to vacuole after combination with protein may be one of the main mechanisms in Cd-accumulator Jerusalem artichoke genotypes.In order to investigate the mechanisms in two Jerusalem artichoke (Helianthus tuberosus L.) genotypes that hyperaccumulate Cd, a sand-culture experiment was carried out to characterize fractionation of Cd in tissue of Cd-hyperaccumulating genotypes NY2 and NY5. The sequential extractants were: 80% v/v ethanol (FE), deionized water (F-W), 1M NaCl (F-NaCl), 2% v/v acetic acid (F-Acet), and 0.6M HCl (F-HCl). After 20 days of treatments, NY5 had greater plant biomass and greater Cd accumulation in tissues than NY2. In both genotypes the FNaCl fraction was the highest in roots and stems, whereas the FAcet and FHCl fractions were the highest in leaves. With an increase in Cd concentration in the culture solution, the content of every Cd fraction also increased. The FW and FNaCl ratios in roots were lower in NY5 than in NY2, while the amount of other Cd forms was higher. It implied that, in high accumulator, namely, NY5, the complex of insoluble phosphate tends to be shaped more easily which was much better for Cd accumulation. Besides, translocation from plasma to vacuole after combination with protein may be one of the main mechanisms in Cd-accumulator Jerusalem artichoke genotypes
