869 research outputs found
Ruddlesden-Popper faults in LaNiO3/LaAlO3 superlattices
Scanning transmission electron microscopy in combination with electron
energy-loss spectroscopy is used to study LaNiO3/LaAlO3 superlattices grown on
(La,Sr)AlO4 with varying single-layer thicknesses which are known to control
their electronic properties. The microstructure of the films is investigated on
the atomic level and the role of observed defects is discussed in the context
of the different properties. Two types of Ruddlesden-Popper faults are found
which are either two or three dimensional. The common planar Ruddlesden-Popper
fault is induced by steps on the substrate surface. In contrast, the
three-dimensionally arranged Ruddlesden-Popper fault, whose size is in the
nanometer range, is caused by the formation of local stacking faults during
film growth. Furthermore, the interfaces of the superlattices are found to show
different sharpness, but the microstructure does not depend substantially on
the single-layer thickness.Comment: 14 pages, 6 figure
Digital modulation of the nickel valence state in a cuprate-nickelate heterostructure
Layer-by-layer oxide molecular beam epitaxy has been used to synthesize
cuprate-nickelate multilayer structures of composition
(LaCuO)/LaO/(LaNiO). In a combined experimental and
theoretical study, we show that these structures allow a clean separation of
dopant and doped layers. Specifically, the LaO layer separating cuprate and
nickelate blocks provides an additional charge that, according to density
functional theory calculations, is predominantly accommodated in the
interfacial nickelate layers. This is reflected in an elongation of bond
distances and changes in valence state, as observed by scanning transmission
electron microscopy and x-ray absorption spectroscopy. Moreover, the predicted
charge disproportionation in the nickelate interface layers leads to a
thickness-dependent metal-to-insulator transition for , as observed in
electrical transport measurements. The results exemplify the perspectives of
charge transfer in metal-oxide multilayers to induce doping without introducing
chemical and structural disorder
Розрахунок довговічності матеріалів при нерегулярному непропорційному навантажуванні
Із метою розробки адекватних моделей для розрахунку довговічності аналізуються наведені
в літературних джерелах експериментальні дані щодо малоциклової втоми сталі 304 та
титанового сплаву ВТ9 під час деформування за складними історіями навантаження, що
являють собою у просторі повних деформацій послідовність блоків різних за формою циклів.
За базові використовуються чотири моделі накопичування пошкоджень та деформаційний
критерій малоциклової втоми. Виконано порівняльний аналіз моделей прогнозування довговічності.
Показано, що застосування удосконаленого нелінійного правила накопичування
пошкоджень дозволяє покращити результати прогнозування довговічності, причому у більшій
мірі для програм, що включають непропорційні цикли.С целью разработки адекватных моделей для расчета долговечности анализируются
приведенные в литературных источниках данные по малоцикловой
усталости стали 304 и титанового сплава ВТ9 в процессе деформирования по
сложным историям нагружения, которые представляют собой в пространстве
полных деформаций последовательность блоков разных по форме циклов. В
качестве базовых применяются четыре модели накопления повреждений и
деформационный критерий малоцикловой усталости. Проведен сравнительный
анализ моделей прогнозирования долговечности. Показано, что применение
усовершенствованного нелинейного правила накопления повреждений позволяет
улучшить результаты прогнозирования долговечности, причем в большей
степени для программ, которые включают непропорциональные циклы.We analyze the experimental data available in
the literature on low-cycle fatigue of 304 steel
and VT9 titanium alloy subjected to loads with
complex loading histories, which are represented
in the space of total deformations by a
sequence of loading blocks consisting of cycles
of various shapes. As models for the material
life prediction, we use four models of damage
accumulation, as well as the low-cycle fatigue
deformation criterion. A comparative analysis
of life prediction models is provided. It is
shown that application of the refined nonlinear
damage accumulation rule leads to the improvement
of the life prediction results, which effect
is more pronounced for loading programs containing
nonproportional cycles
Long-range charge density wave proximity effect at cuprate-manganate interfaces
The interplay between charge density waves (CDWs) and high-temperature
superconductivity is currently under intense investigation. Experimental
research on this issue is difficult because CDW formation in bulk copper-oxides
is strongly influenced by random disorder, and a long-range-ordered CDW state
in high magnetic fields is difficult to access with spectroscopic and
diffraction probes. Here we use resonant x-ray scattering in zero magnetic
field to show that interfaces with the metallic ferromagnet
LaCaMnO greatly enhance CDW formation in the optimally
doped high-temperature superconductor YBaCuO (), and that this effect persists over several tens of nm. The wavevector
of the incommensurate CDW serves as an internal calibration standard of the
charge carrier concentration, which allows us to rule out any significant
influence of oxygen non-stoichiometry, and to attribute the observed phenomenon
to a genuine electronic proximity effect. Long-range proximity effects induced
by heterointerfaces thus offer a powerful method to stabilize the charge
density wave state in the cuprates, and more generally, to manipulate the
interplay between different collective phenomena in metal oxides.Comment: modified version published in Nature Material
МНОГОФАЗНО-ОДНОФАЗНыЕ РЕВЕРСИВНыЕ ЭЛЕКТРОМАШИННО-ВЕНТИЛЬНыЕ ПРЕОБРАЗОВАТЕЛИ БЕСКОНТАКТНыХ МАШИН ДВОЙНОГО ПИТАНИЯ
Розглянуто процеси в багатофазно-однофазних реверсивних електромашинно-вентильних перетворю-
вачах безконтактних машин подвійного живлення.
Рассмотрены процессы в многофазно-однофазных реверсивных электромашинно-вентильных преобра-
зователях бесконтактных машин двойного питания
Borderline personality disorder in young people: associations with support and negative interactions in relationships with mothers and a best friend
BACKGROUND: Impaired interpersonal functioning has been highlighted as a core feature of borderline personality disorder (BPD). Adolescence and young adulthood form important developmental stages within both the emergence of BPD and the development of interpersonal functioning, which takes place mostly in relationships with parents and friends. This study aimed to: (i) investigate relations between BPD symptoms and both supportive and negative interactions with mothers and best friends; (ii) investigate whether the relations were moderated by age; (iii) test the robustness of our findings by comparing the results based on self-reports with results from a subsample in which supportive and negative interactions with mothers were rated by the mother. METHODS: 312 young people referred to mental healthcare completed self-report measures on BPD and supportive and negative interactions. Multiple regression analyses were conducted to examine the relations between BPD features and perceived supportive and negative interactions with mothers and a best friend, and to investigate whether these relations were moderated by age. Robustness of our findings was studied in a subsample (n = 104), by using a multi-informant design in maternal report on supportive and negative interactions with mothers. RESULTS: Multiple regression analyses demonstrated that negative interactions with mothers as well as with a best friend were related to more BPD symptoms in young people. Supportive interactions were not related to BPD symptoms. Both BPD and quality of relations were not related to age. In a subsample in which supportive and negative interactions with mothers were rated by the mother, the maternal report showed slightly different results. In this model, both supportive and negative interactions with a best friend were positively related, whereas interactions with mothers were not related to BPD symptoms in young people. CONCLUSIONS: Results highlight the importance of relationships with mothers and a best friend during adolescence and young adulthood. Given that BPD often emerges during this developmental phase, future research is needed to clarify how quality of relationships could alter pathways toward BPD in young people. TRIAL REGISTRATION: Not applicable
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