5 research outputs found
Skew-symmetric matrices related to the vector cross product in c7
No full textP. D. Beites was supported by FCT (Fundação para a Ciência, Portugal), research project UIDB/00212/2020 of CMA-UBI (Centro de Matemática e Aplicações, Universidade da Beira Interior, Portugal), and by
the research project MTM2017-83506-C2-2-P, Spain. The author A. P. Nicolás was supported by the latter research project
Optimization of multilayer graphene-based gas sensors by ultraviolet photoactivation
No full textCRUE-CSIC (Acuerdos Transformativos 2022)
© 2022 The Author(s).
Author A. P. received funding from grant PRE2019-0875001234, Ministerio de Ciencia e Innovación (MCI), Spain. D. M. received funding from Comfuturo, Consejo Superior de Investigaciones Científicas, Spain. Authors A. P., D. M., D. O., P. M., and M- C. H. received funding from projects RTI2018-095856-B-C21 and –C22, Ministerio de Ciencia e Innovación, Spain. A. P. and P. M. received funding S2018/ NMT-4321, Comunidad de Madrid. J. L.-S. received funding from project PID2020-114192RB-C41, Ministerio de Asuntos Económicos y Transformación Digital (MINECO).Nitrogen dioxide (NO2) is a potential hazard to human health at low concentrations, below one part per million (ppm). NO2 can be monitored using gas sensors based on multi-layered graphene operating at ambient temperature. However, reliable detection of concentrations on the order of parts per million and lower is hindered by partial recovery and lack of reproducibility of the sensors after exposure. We show how to overcome these longstanding problems using ultraviolet (UV) light. When exposed to NO2, the sensor response is enhanced by 290 % − 550 % under a 275 nm wavelength light emitting diode irradiation. Furthermore, the sensor’s initial state is completely restored after exposure to the target gas. UV irradiation at 68 W/m2 reduces the NO2 detection limit to 30 parts per billion (ppb) at room temperature. We investigated sensor performance optimization for UV irradiation with different power densities and target gases, such as carbon oxide and ammonia. Improved sensitivity, recovery, and reproducibility of UV-assisted graphene-based gas sensors make them suitable for widespread environmental applications.Ministerio de Ciencia e Innovación (MICINN)Ministerio de Asuntos Económicos y Transformación Digital (MINECO)Comunidad de MadridConsejo Superior de Investigaciones Científicas (CSIC)Depto. de Física de MaterialesFac. de Ciencias FísicasTRUEpu
Crystallization Kinetics of Organic–Inorganic Trihalide Perovskites and the Role of the Lead Anion in Crystal Growth
No full text© 2015 American Chemical Society. Methylammonium lead halide perovskite solar cells continue to excite the research community due to their rapidly increasing performance which, in large part, is due to improvements in film morphology. The next step in this progression is control of the crystal morphology which requires a better fundamental understanding of the crystal growth. In this study we use in situ X-ray scattering data to study isothermal transformations of perovskite films derived from chloride, iodide, nitrate, and acetate lead salts. Using established models we determine the activation energy for crystallization and find that it changes as a function of the lead salt. Further analysis enabled determination of the precursor composition and showed that the primary step in perovskite formation is removal of excess organic salt from the precursor. This understanding suggests that careful choice of the lead salt will aid in controlling crystal growth, leading to superior films and better performing solar cells.The authors acknowledge financial support from the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award DE-SC0010560. K.W.T. gratefully acknowledges the Singapore Energy Innovation Program Office for a National Research Foundation graduate fellowship. This work made use of the research facilities of the Cornell Center for Materials Research (CCMR) with support from the NSF Materials Research Science and Engineering Centers (MRSEC) program (DMR-1120296), Cornell High Energy Synchrotron Source (CHESS) which is supported by the NSF and the NIH/National Institute of General Medical Sciences under NSF awards DMR-0936384 and DMR-1332208, and the KAUST-Cornell Center for Energy and Sustainability supported by Award KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). W.Z. and H.J.S thank the EPSRC Supergen, ERC Hyper Project, for financial support. The authors acknowledge the use of Fit2D for WAXS data analysis and thank the author, A. P. Hammersley, and ESRF, for its development and free use. The authors gratefully acknowledge T. Scott, M. Koker, and R. Li of Cornell University for kind experimental assistance
Multidimensional space of philology
No full textThe review is dedicated to the book by V. S. Krivonos, a well-known literary scholar, researcher of N. V. Gogol’s work and the Russian literature of the 19th-21st centuries, Doctor of Philological Sciences, Professor of Samara State Social and Pedagogical University. The monograph, which has an unusual title for academic literary criticism, reveals different aspects of the scholar’s interests: it contains academic articles, research on the history of philological science, and closes with an unexpected section “On the Borders of Philology and Literature”, where the author acts as a witty mystifier and stylizer. The book has a tense internal plot, the three main sections of the monograph are united by recurrent motifs that are revealed in different ways in historical, literary and biographical contexts. The first section of the book, in line with classical literary criticism, is dedicated to the analysis of prose of the 19th-20th centuries, from Bestuzhev-Marlinsky to Sasha Sokolov. The defining and unifying feature of the majority of the articles here is the clearly verified interrelation of the historical and theoretical approaches to text analysis. The articles included in the section, on the one hand, demonstrate the unique specific features of this or that author’s oeuvre, on the other hand, they show the organic unity of the writers’ works, which the researcher looks at largely through Gogol’s “optics”. The second section contains valuable research and biographical materials about the greatest philologists who influenced the author: A. P. Skaftymov, B. F. Egorov, Yu. N. Chumakov. The study of the “text of fate”, the understanding of the role of chance and the problem of choice in the biographies of outstanding Russian literary scholars unite this section with the first, where these topics are analyzed on the material of literary texts. In the third section, the author enters into a lively dialogue with the heroes of his research, presenting to the reader possible continuations of the plots of classical and modern literature
Gastronomic picture of the world in works by A. P. Chekhov
No full textCulinary and gastronomy vocabulary and its functioning in the language has attracted attention of linguists lately. National gastronomic preferences retain their specific character and are reflected in the language. Axiological picture of the world is built in each lingual culture on the basis of a conceptual picture of the world which is actualized in the language of the nation. The primary and basic sphere of appearance and existence of cultural values is a mode of life with its vitally important element — gastronomy which is understood as the complex of processes of acquiring, cooking and consuming food. Literary text reflects a language personality of a writer, it serves as an adequate translator of national concepts creating the image of a national picture of the world. We suppose that reality which has passed through the prism of a creative thought is reflected in the language personality of an author. Literary picture of the world contains the image of the world, reflects the person’s existence through the literary text. Addressing the works of a famous Russian author A. P. Chekhov gives us an opportunity to single out the peculiarities of his language personality and to see in the individual style of his works the distinctive features of the whole nation.В последнее время кулинарно-гастрономическая лексика и ее функционирование в языке привлекает пристальное внимание ученых-лингвистов. Национальные гастрономические предпочтения сохраняют свою специфику и отражаются в культуре и языке. Ценностная картина мира строится в каждой лингвокультуре на основе концептуальной картины мира, которая актуализируется в языке народа. Первичной и основной областью появления и существования ценностей культуры является быт, в ядре которого как витально значимый феномен находится гастрономия, рассматриваемая как комплекс процессов добывания, приготовления и потребления продуктов питания. Художественный текст отражает языковую личность автора, служит адекватным транслятором национальных концептов, создавая представление о национальной картине мира. Мы считаем, что в авторской картине мира отражена реальность, прошедшая через призму творческой мысли. Художественная картина мира, таким образом, заключает в себе образ мира и отображает человеческое бытие через текст художественного произведения. Обращение к творчеству великого русского писателя А. П. Чехова позволяет выявить как некоторые особенности его языковой личности, так и увидеть в индивидуальном стиле его текстов черты, присущие всей языковой общности
