Experimental Study Of Improving The Physical Properties Of Peat Soil Using Sand And Bio-Grouting Techniques With The Assistance Of Bacillus Subtilis Bacteria

Peat soil was categorized as soft soil, which means that the soil is in bad condition and problematic when construction was built on it. It was necessary to increase the carrying capacity of peat soils, one of which is chemical stabilization of the soil, by adding additives that can react with the soil and using new environmentally friendly methods. In this study, samples of peat soil were taken from Buana Makmur Village km55, Dayun District, Siak Regency. The stabilizing agent used was sand as much as 5% by weight of dry soil, Bacillus Subtilis bacteria obtained from the Agriculture Laboratory of the Islamic University of Riau, and also CaCL₂ and Urea. The method for stabilizing the physical properties of peat soil in this study is the Bio-Grouting method, testing the physical properties of peat soil follows the procedures of ASTM (American Society For Testing And Materials) and SNI 1965-2008 for testing methods for determining water content for soil and rock in the laboratory. SNI 1964-2008 test method for soil specific gravity, SNI 8460-2017 geotechnical design requirements, SK SNI -04-05-1989-F fine sand used for construction, SNI-02-2801-1998 urea standard. To test the physical properties was carried out by providing variations in the mixing of bacterial cementation solutions with levels of 0% (without treatment), 5%, 10%, 15%, 20%, and 25% and then allowed to stand for 14 days using a tightly closed plastic container. The results of testing the physical properties of peat soil found that the peat soil was included in the original soil type with water content = 407.45% and specific gravity (Gs) = 1.30gr, while from the physical properties tests carried out the highest water content occurred in the addition of bacterial cementation solution 10% = 177.2% and the lowest specific gravity occurs when the bacterial cementation solution is added 10% = 1.27gr

Technological characterization of molded islamic pottery from Iberian Peninsula

The thesis examines the technical aspects of unglazed molded ceramics from Mértola, in the context of Islamic archaeology of the Iberian Peninsula (Almohad period, end of 12th and the beginning of 13th century). Ceramics of the time period under discussion (12th – 13th century) are understudied, including in what concern to shaping and firing of ceramic vessels, the origin of raw materials used in ceramics and glazes, and decoration methods such as slip painting and/or colored glazes. Moreover, the use of archaeometry tools is rare. Along with providing a general picture of molded ceramic production in Mértola, this work provides a new dimension to the discipline of Islamic ceramic studies by the analytical tool used and demonstrating the importance of archaeological ceramics of the western peripheries to the understanding the production of ceramics and the transmission of knowledge and cultural traditions within the Islamic caliphate. The chemical and mineralogical characterization of 12th/13th century Almohad unglazed molded ware from Mértola was accomplished through multi – analytical approach combining SEM, Powder/uXRD and LA-ICP-MS methods. In this paper unglazed and glazed samples were analyzed but the attention was given to unglazed specimens, while the glazed samples were used for the comparison with the previous group in order to determine possible similarities or dissimilarities, thus providing enough data to discuss about technical aspects and potential provenance; Resumo: A tese debruça-se sobre os aspetos técnicos de cerâmica de molde não-vidrada de Mértola, no contexto da arqueologia islâmica da Península Ibérica (período Almóada, final de XII e início do século XIII). A cerâmica do período em discussão (séculos XII-XIII) é pouco estudada inclusive no que concerne ao fabrico e à cozedura, à de fonte de matérias-primas, na pasta ou nos esmaltes e aos métodos de decoração, como pintura, presença de engobes ou esmaltes. Além disso, o uso de ferramentas de Arqueometria é raro. Para fornecer uma visão geral da produção de cerâmica moldada em Mértola, este trabalho oferece uma nova dimensão para a disciplina de cerâmica islâmicas pelas ferramentas analíticas utilizadas. Demonstrando a importância da cerâmica arqueológica da periferia ocidental para a compreensão da produção cerâmica e a transmissão de conhecimentos e tradições culturais no califado islâmico. A caracterização mineralógica e química das cerâmicas de molde e não-vidrada, Almóada, dos séculos XII-XIII de Mértola foi realizada através de uma abordagem multi-analítica que combina métodos de SEM-EDS, uXRD e LA-ICP-MS. Neste trabalho, as cerâmicas vidradas e não-vidradas foram analisadas conjuntamente, dando mais atenção aos espécimes não vidrados. As amostras de cerâmicas vidradas foram utilizados para a comparação com o grupo anterior, a fim de determinar as possíveis semelhanças ou diferenças, proporcionando, assim, dados suficientes para discutir os aspetos técnicos e o potencial de proveniência das cerâmicas não vidrada

Superconductivity on the localization threshold and magnetic-field-tuned superconductor-insulator transition in TiN films

Temperature- and magnetic-field dependent measurements of the resistance of ultrathin superconducting TiN films are presented. The analysis of the temperature dependence of the zero field resistance indicates an underlying insulating behavior, when the contribution of Aslamasov-Larkin fluctuations is taken into account. This demonstrates the possibility of coexistence of the superconducting and insulating phases and of a direct transition from the one to the other. The scaling behavior of magnetic field data is in accordance with a superconductor-insulator transition (SIT) driven by quantum phase fluctuations in two-dimensional superconductor. The temperature dependence of the isomagnetic resistance data on the high-field side of the SIT has been analyzed and the presence of an insulating phase was confirmed. A transition from the insulating to a metallic phase is found at high magnetic fields, where the zero-temperature asymptotic value of the resistance being equal to h/e^2.Comment: 5 pages, 4 eps figures, RevTeX4, Published versio

GammaRay 2018 Proceedings: Seminar for users of gamma ray spectrometry

In September 2018 a two day seminar for users of gamma ray spectrometry was arranged in Reykjavik, Iceland. 34 participants from 20 organisations were present. Two lecturers were invited: I. Osvath from IAEA, who gave a presentation on the 2017 IAEA proficiency test with a focus on the sample with the more challenging short lived radionuclides, and M. Bruggeman from SCK-CEN, who gave a presentation on efficiency transfer for low-energy gamma-ray spectrometry. In addition, 14 participants presented development and experiences related to gamma-ray spectrometry. This seminar was the 9th in a serie since 2009 financed by NKS

Oxygen reduction reactions on pure and nitrogen-doped graphene: a first-principles modeling

Based on first principles density functional theory calculations we explored energetics of oxygen reduction reaction over pristine and nitrogen-doped graphene with different amounts of nitrogen doping. The process of oxygen reduction requires one more step then same reaction catalyzed by metals. Results of calculations evidence that for the case of light doped graphene (about 4% of nitrogen) energy barrier for each step is lower than for the same process on Pt surface. In contrast to the catalysis on metal surface the maximal coverage of doped graphene is lower and depends on the corrugation of graphene. Changes of the energy barriers caused by oxygen load and corrugation are also discussed.Comment: 11 pages, 2 figures, accepted in Nanoscale as communicatio

La théorie de Platon sur l'Un et la Dyade indéfinie et ses traces dans la mathématique grecque.

Marcovic Željko. La théorie de Platon sur l'Un et la Dyade indéfinie et ses traces dans la mathématique grecque.. In: Revue d'histoire des sciences et de leurs applications, tome 8, n°4, 1955. pp. 289-297

[Deconstructing silos in large organizations through entrepreneurial orientation]

Entrepreneuria

Propuesta de plan de mejora de la comunicación organizacional para fortalecer la participación y clima escolar en la Institucion Educativa Santa Rosa, Distrito de Tarapoto, Provincia y Región San Martín, 2018

Tesis de segunda especialidadA partir de los sin número de problemas que se presentan en la institución educativa, y con la intención de contribuir a solucionarlos, y en este caso mejorar el clima escolar y la participación de los miembros de la comunidad educativa, es que se plantea el trabajo académico denominado “PROPUESTA DE PLAN DE MEJORA DE LA COMUNICACIÓN ORGANIZACIONAL PARA FORTALECER LA PARTICIPACIÓN Y CLIMA ESCOLAR EN LA INSTITUCION EDUCATIVA “SANTA ROSA”, DISTRITO DE TARAPOTO, PROVINCIA Y REGIÓN SAN MARTÍN, 2018”, que tiene como objetivo : Mejorar la comunicación organizacional para para fortalecer la participación y clima escolar en la “IE “Santa Rosa”, en la que tiene como participantes al personal directivo, jerárquico, docente y administrativos de la Institución Educativa “Santa Rosa”. Para la elaboración del Plan de Acción se aplicó la metodología de la investigación aplicada con un diseño de acción – participación, la encuesta fue el instrumento que nos permitió recoger información, la misma que nos llevó al diagnóstico y desde la cual se priorizo e identifico el problema, y formulación del problema, utilizando referentes conceptuales y teóricos de den sustento al Plan de Acción, para luego desarrollar la propuesta. La pudo recoger las necesidades y demandas de los involucrados, y determinar que la comunicación organizacional es fundamental para mejorar el clima y la participación escolar, y por ende alcanzar los objetivos y metas institucionales, fortaleciendo el liderazgo pedagógico del directivo, por lo que su implementación es necesaria