Alteration of superconductivity of suspended carbon nanotubes by deposition of organic molecules

We have altered the superconductivity of a suspended rope of single walled carbon nanotubes, by coating it with organic polymers. Upon coating, the normal state resistance of the rope changes by less than 20 percent. But superconductivity, which on the bare rope shows up as a substantial resistance decrease below 300 mK, is gradualy suppressed. We correlate this to the suppression of radial breathing modes, measured with Raman Spectroscopy on suspended Single and Double-walled carbon nanotubes. This points to the breathing phonon modes as being responsible for superconductivity in carbon nanotubes

Rod-Climbing Effect in Newtonian Fluids

Theoretical Physic

Ballistic- and quantum-conductor carbon nanotubes: A reference experiment put to the test

We have performed electrical transport experiments on individual carbon nanotubes (CNTs) in situ in a transmission electron microscope using the liquid-metal contact method (LMC method), which consists of immersing a CNT placed on the apex of a metallic tip into a drop of liquid mercury (Hg). In the literature, this method has been mostly employed without visualization (ex situ) to show the ballistic- and quantum-conductance properties of different kinds of CNTs. We show that on the one hand the in situ LMC method is well suited to create low-resistance contacts with the CNTs but on the other hand the ballistic and quantum conductance measured by the ex situ LMC method is likely to give false positives for three reasons: (a) the CNTs are likely to be removed from the tip surface through contact with the Hg, (b) occurring Hg-tip surface nanocontacts are likely to be mistaken for quantum-conductor CNTs, and (c) occurring Hg nanomenisci are likely to be mistaken for ballistic-conductor CNTs. These findings have strong consequences for the interpretation of previously reported works

Особливості сучасної української воєнної прози ( на прикладі кіноповісті « Укри » Богдана Жолдака та роману « Іловайськ » Євгена Положія )

Features of Modern Ukrainian Military Prose (on the example of Bohdan Zholdak’s film story “Ukry” and Yevhen Polozhii’s novel “Ilovaisk”) / Nataliia Kobylko, Oleh Honcharuk, Larysa Horbolis, Svitlana Antonovych // Amazonia Investiga. – 2022. – Vol. 11, Issue 53 (May). – P. 92-100. – DOI: https://doi.org/10.34069/AI/2022.53.05.9.Kobylko, N., Honcharuk, O., Horbolis, L., & Antonovych, S. (2022). Features of Modern Ukrainian Military Prose (on the example of Bohdan Zholdak’s film story “Ukry” and Yevhen Polozhii’s novel “Ilovaisk”). Amazonia Investiga, 11(53), 92-100. https://doi.org/10.34069/AI/2022.53.05.9Мета статті – дослідження художніх особливостей воєнної прози «Укри» Богдана Жолдака та «Іловайськ» Євгена Положія. Методологічна основа дослідження має комплексний характер і базується, у першу чергу, на інструментарії традиційного літературознавства (порівняльно-типологічному, порівняльно-історичному й конкретно- текстуальному видах літературознавчого аналізу) з використанням елементів мотивного аналізу. У статті досліджено воєнну прозу як феномен сучасної української літератури; жанрову різноманітність творів, присвячених реаліям АТО та війні на Донбасі; основні проблеми, які порушують письменники. Визначено, що в кіноповісті «Укри» Богдана Жолдака показано «благородного, активного, сильного героя, що відстоює свободу, справедливість та загальнолюдські ідеали». Розглянуто жолданівський стиль (бурлескно-постмодерний) зображення персонажів: з їхніми позитивними й негативними сторонами, правдивою мовою та емоції. Проаналізовано роман «Іловайськ» Євгена Положія, в основу якого лягли спогади бійців, що пережили «Іловайський котел». Визначено, що письменник звертається до традиційного сюжету та змалювання героїв, використовуючи риси екзистенціалізму та натуралізму, часто вдається до контрасту як у відтворенні картин фронтового й мирного Донбасу, так і ідейних переконань старшого й молодшого поколінь. Доведено, що у творах сучасної української літератури відбувається глибоке переосмислення війни, яка несе потенційну загрозу не лише окремій країні та її жителям, а людству взагалі. Автори утверджують ідею миру як найвищої людської цінності.The purpose of the article is to study the artistic features of Bohdan Zholdak’s military prose "Ukry" and Yevhen Polozhii’s "Ilovaisk". The methodological basis of the study is complex and is based mainly on the tools of traditional literary studies (comparative-typological, comparative-historical and specific-textual types of literary analysis) using elements of motivational analysis. The article examines military prose as a phenomenon of modern Ukrainian literature; genre diversity of works dedicated to the realities of the anti-terrorist operation and the war in Donbas; the main problems that writers raise. It is determined that Bohdan Zholdak’s film story “Ukry” shows “a noble, active, strong hero who defends freedom, justice and universal ideals.” Zholdak’s style (burlesque-postmodern) depiction of characters is considered with their positive and negative sides, true language and emotions. Yevhen Polozhii’s novel “Ilovaisk” was analyzed, based on the memoirs of soldiers who survived the Ilovaisk pocket. It is determined that the writer turns to the traditional plot and depiction of heroes, using the features of existentialism and naturalism, often resorting to contrast in the reproduction of pictures of frontal and peaceful Donbas, and ideological beliefs of older and younger generations. It is proved that in the works of modern Ukrainian literature there is a deep rethinking of the war, which poses a potential threat not only to the individual country and its inhabitants, but to humanity in general. The authors affirm the idea of peace as the highest human value.Цель статьи – исследование художественных особенностей военной прозы «Укры» Богдана Жолдака и «Иловайск» Евгения Положия. Методологическая основа исследования носит комплексный характер и базируется, в первую очередь, на инструментарии традиционного литературоведения (сравнительно-типологическом, сравнительно-историческом и конкретно текстуальном видах литературоведческого анализа) с использованием элементов мотивного анализа. В статье исследована военная проза как феномен современной украинской литературы; жанровое разнообразие произведений, посвященных реалиям АТО и войне на Донбассе

Investigation of the influence of stabilisation additions upon the structure and properties of foam produced by semi-solid processing

Using expandometry, X-ray computer-tomography in combination with a newly-developed software for pore-size evaluation and compression tests, the influence of adding elements and particles upon foaming behaviour, structure and mechanical properties of AlSi6Cu4 foams based on thixocast precursor materials was investigated. Especially for In and for 3micrometer-Al2O3-particles, significant improvements of the foaming behaviour as expressed by the maximum expansion levels obtainable could be observed. In contrast, no major variation of compression strength was substantiated by the experimental data, the exception to the rule being Sn additions, which led to a deterioration of strength as consequence of unfavourable microstructural characteristics. Pore sizes, however, have invariably been found to decrease irrespective of nature and concentration of additions. Thus the study suggests that the use of additives of the kind evaluated here should be motivated by requirements regarding expansion performance rather than maximum strength. However, given the limited number of samples available, the influence of the observed structural changes on the scatter of mechanical properties could not be judged. Therefore, a continuation of the present study to verify the influence of mesostructural features on property variation at given densities may be considered worthwhile

Towards correlating Raman excitation profile and electron diffraction of the same single carbon nanotube

We present the first results of a study combining electron diffraction analysis and Raman resonance excitation profile on the identical, suspended single wall carbon nanotube. Both methods give access to the diameter of the tube, which allows cross-checking. The characterization of the tube is completed by the determination of the transition energy Eii, and the chirality, allowing a precise comparison with theoretical models

Towards correlating Raman excitation profile and electron diffraction of the same single carbon nanotube

International audienc